DIM A[5],B[5],C[10]

! ! for rosettacode.org !

BEGIN DATA(1,2,3,4,5) DATA(6,7,8,9,0)

FOR I=1 TO 5 DO ! read array A[.] READ(A[I]) END FOR FOR I=1 TO 5 DO ! read array B[.] READ(B[I]) END FOR

FOR I=1 TO 10 DO ! append B[.] to A[.] IF I>5 THEN C[I]=B[I-5] ELSE C[I]=A[I] END IF PRINT(C[I];) ! print single C value END FOR

PRINT

END PROGRAM

## Euphoria


```Euphoria
sequence s1,s2,s3
s1 = {1,2,3}
s2 = {4,5,6}
s3 = s1 & s2
? s3

{{out}} {1,2,3,4,5,6}

=={{header|F Sharp|F#}}== Array concatenation.

let a = [|1; 2; 3|]
let b = [|4; 5; 6;|]
let c = Array.append a b

List concatenation (@ and List.append are equivalent).

let x = [1; 2; 3]
let y = [4; 5; 6]
let z1 = x @ y
let z2 = List.append x y

FBSL

Array concatenation:

#APPTYPE CONSOLE

DIM aint[] ={1, 2, 3}, astr[] ={"one", "two", "three"}, asng[] ={!1, !2, !3}

FOREACH DIM e IN ARRAYMERGE(aint, astr, asng)
	PRINT e, " ";
NEXT

PAUSE

{{out}}

1 2 3 one two three 1.000000 2.000000 3.000000
Press any key to continue...

Factor

'''Example''':

```factor
( scratchpad ) USE: sequences
( scratchpad ) { 1 2 } { 3 4 } append .
{ 1 2 3 4 }

Fantom

In fansh:

> a := [1,2,3]
> b := [4,5,6]
> a.addAll(b)
> a
[1,2,3,4,5,6]

Note 'addAll' is destructive. Write 'a.dup.addAll(b)' to create a fresh list.

Forth

: $!+   ( a u a' -- a'+u )
  2dup + >r swap move r> ;
: cat   ( a2 u2 a1 u1 -- a3 u1+u2 )
  align here dup >r $!+ $!+ r> tuck - dup allot ;

\ TEST
create a1 1 , 2 , 3 ,
create a2 4 , 5 ,
a2 2 cells a1 3 cells cat dump

8018425F0: 01 00 00 00  00 00 00 00 - 02 00 00 00  00 00 00 00  ................
801842600: 03 00 00 00  00 00 00 00 - 04 00 00 00  00 00 00 00  ................
801842610: 05 00 00 00  00 00 00 00 -                           ........

Fortran

{{works with|Fortran|90 and later}}

program Concat_Arrays
  implicit none

  ! Note: in Fortran 90 you must use the old array delimiters (/ , /)
  integer, dimension(3) :: a = [1, 2, 3] ! (/1, 2, 3/)
  integer, dimension(3) :: b = [4, 5, 6] ! (/4, 5, 6/)
  integer, dimension(:), allocatable :: c, d

  allocate(c(size(a)+size(b)))
  c(1 : size(a)) = a
  c(size(a)+1 : size(a)+size(b)) = b
  print*, c

  ! alternative
  d = [a, b] ! (/a, b/)
  print*, d
end program Concat_Arrays

FreeBASIC

' FB 1.05.0 Win64

Sub ConcatArrays(a() As String, b() As String, c() As String)
   Dim aSize As Integer = UBound(a) - LBound(a) + 1
   Dim bSize As Integer = UBound(b) - LBound(b) + 1
   Dim cSize As Integer = aSize + bSize
   Redim c(0 To cSize - 1)
   Dim i As Integer
   For i = 0 To aSize - 1
     c(i) = a(LBound(a) + i)
   Next
   For i = 0 To bSize - 1
     c(UBound(a) + i + 1) = b(LBound(b) + i)
   Next
End Sub

Dim a(3) As String = {"The", "quick", "brown", "fox"}
Dim b(4) As String = {"jumped", "over", "the", "lazy", "dog"}
Dim c() As String
ConcatArrays(a(), b(), c())
For i As Integer = LBound(c) To UBound(c)
  Print c(i); " ";
Next
Print : Print
Print "Press any key to quit the program"
Sleep

{{out}}

The quick brown fox jumped over the lazy dog

Free Pascal

Since FPC (Free Pascal compiler) version 3.2.0., the dynamic array concatenation operator + is available, provided {$modeSwitch arrayOperators+} (which is enabled by default in {$mode Delphi}).

## Frink


```frink

a = [1,2]
b = [3,4]
a.pushAll[b]

FunL

arr1 = array( [1, 2, 3] )
arr2 = array( [4, 5, 6] )
arr3 = array( [7, 8, 9] )

println( arr1 + arr2 + arr3 )

{{out}}

ArraySeq(1, 2, 3, 4, 5, 6, 7, 8, 9)

Futhark

Array concatenation is done with the built-in function concat, which can take any number of arguments:

concat as bs cd

Gambas

'''[https://gambas-playground.proko.eu/?gist=314bea6fba7f177a1cfaec8a7a8b5ccb Click this link to run this code]'''

Public Sub Main()
Dim sString1 As String[] = ["The", "quick", "brown", "fox"]
Dim sString2 As String[] = ["jumped", "over", "the", "lazy", "dog"]

sString1.Insert(sString2)

Print sString1.Join(" ")

End

Output:

The quick brown fox jumped over the lazy dog

GAP

# Concatenate arrays
Concatenation([1, 2, 3], [4, 5, 6], [7, 8, 9]);
# [ 1, 2, 3, 4, 5, 6, 7, 8, 9 ]

# Append to a variable
a := [1, 2, 3];
Append(a, [4, 5, 6);
Append(a, [7, 8, 9]);
a;
# [ 1, 2, 3, 4, 5, 6, 7, 8, 9 ]

Genie

[indent=4]
/*
   Array concatenation, in Genie
   Tectonics: valac array-concat.gs
*/

/* Creates a new array */
def int_array_concat(x:array of int, y:array of int):array of int
    var a = new Array of int(false, true, 0)  /* (zero-terminated, clear, size) */
    a.append_vals (x, x.length)
    a.append_vals (y, y.length)

    z:array of int = (owned) a.data
    return z

def int_show_array(a:array of int)
    for element in a do stdout.printf("%d ", element)
    stdout.printf("\n")

init
    x: array of int = {1, 2, 3}
    y: array of int = {3, 2, 1, 0, -1}
    z: array of int = int_array_concat(x, y)

    stdout.printf("x: "); int_show_array(x)
    stdout.printf("y: "); int_show_array(y)
    stdout.printf("z: "); int_show_array(z)
    print "%d elements in new array", z.length

{{out}}

prompt$ valac array-concat.gs
prompt$ ./array-concat
x: 1 2 3
y: 3 2 1 0 -1
z: 1 2 3 3 2 1 0 -1
8 elements in new array

Go

package main

import "fmt"

func main() {
    // Example 1:  Idiomatic in Go is use of the append function.
    // Elements must be of identical type.
    a := []int{1, 2, 3}
    b := []int{7, 12, 60} // these are technically slices, not arrays
    c := append(a, b...)
    fmt.Println(c)

    // Example 2:  Polymorphism.
    // interface{} is a type too, one that can reference values of any type.
    // This allows a sort of polymorphic list.
    i := []interface{}{1, 2, 3}
    j := []interface{}{"Crosby", "Stills", "Nash", "Young"}
    k := append(i, j...) // append will allocate as needed
    fmt.Println(k)

    // Example 3:  Arrays, not slices.
    // A word like "array" on RC often means "whatever array means in your
    // language."  In Go, the common role of "array" is usually filled by
    // Go slices, as in examples 1 and 2.  If by "array" you really mean
    // "Go array," then you have to do a little extra work.  The best
    // technique is almost always to create slices on the arrays and then
    // use the copy function.
    l := [...]int{1, 2, 3}
    m := [...]int{7, 12, 60} // arrays have constant size set at compile time
    var n [len(l) + len(m)]int
    copy(n[:], l[:]) // [:] creates a slice that references the entire array
    copy(n[len(l):], m[:])
    fmt.Println(n)

}

{{out}}

[1 2 3 7 12 60]
[1 2 3 Crosby Stills Nash Young]
[1 2 3 7 12 60]

Array concatenation needs can vary. Here is another set of examples that illustrate different techniques.

package main

import (
  "reflect"
  "fmt"
)

// Generic version
// Easier to make the generic version accept any number of arguments,
// and loop trough them. Otherwise there will be lots of code duplication.
func ArrayConcat(arrays ...interface{}) interface{} {
  if len(arrays) == 0 {
    panic("Need at least one arguemnt")
  }
  var vals = make([]*reflect.SliceValue, len(arrays))
  var arrtype *reflect.SliceType
  var totalsize int
  for i,a := range arrays {
    v := reflect.NewValue(a)
    switch t := v.Type().(type) {
    case *reflect.SliceType:
      if arrtype == nil {
        arrtype = t
      } else if t != arrtype {
        panic("Unequal types")
      }
      vals[i] = v.(*reflect.SliceValue)
      totalsize += vals[i].Len()
    default: panic("not a slice")
    }
  }
  ret := reflect.MakeSlice(arrtype,totalsize,totalsize)
  targ := ret
  for _,v := range vals {
    reflect.Copy(targ, v)
    targ = targ.Slice(v.Len(),targ.Len())
  }
  return ret.Interface()
}

// Type specific version
func ArrayConcatInts(a, b []int) []int {
  ret := make([]int, len(a) + len(b))
  copy(ret, a)
  copy(ret[len(a):], b)
  return ret
}

func main() {
  test1_a, test1_b := []int{1,2,3}, []int{4,5,6}
  test1_c := ArrayConcatInts(test1_a, test1_b)
  fmt.Println(test1_a, " + ", test1_b, " = ", test1_c)

  test2_a, test2_b := []string{"a","b","c"}, []string{"d","e","f"}
  test2_c := ArrayConcat(test2_a, test2_b).([]string)
  fmt.Println(test2_a, " + ", test2_b, " = ", test2_c)
}

{{out}}

[1 2 3]  +  [4 5 6]  =  [1 2 3 4 5 6]
[a b c]  +  [d e f]  =  [a b c d e f]

Gosu

var listA = { 1, 2, 3 }
var listB = { 4, 5, 6 }

var listC = listA.concat( listB )

print( listC ) // prints [1, 2, 3, 4, 5, 6]

Groovy

Solution:

def list = [1, 2, 3] + ["Crosby", "Stills", "Nash", "Young"]

Test:

{{out}}

```txt
[1, 2, 3, Crosby, Stills, Nash, Young]

Haskell

A list is in Haskell one of the most common composite data types (constructed from other types). In the documentation we read for the append operation ++:

(++) :: [a] -> [a] -> [a]

Append two lists, i.e.:

[x1, ..., xm] ++ [y1, ..., yn] == [x1, ..., xm, y1, ..., yn]
[x1, ..., xm] ++ [y1, ...] == [x1, ..., xm, y1, ...]

If the first list is not finite, the result is the first list.

HicEst

REAL :: a(7), b(3), c(10)

c = a
DO i = 1, LEN(b)
   c(i + LEN(a)) = b(i)
ENDDO

Hy

 (setv a [1 2 3])
=> a
[1, 2, 3]

=> (+ a [4 5 6]) ; returns the concatenation
[1, 2, 3, 4, 5, 6]
=> a
[1, 2, 3]

=> (.extend a [7 8 9]) ; modifies the list in place
=> a
[1, 2, 3, 7, 8, 9]

=> (+ [1 2] [3 4] [5 6]) ; can accept multiple arguments
[1, 2, 3, 4, 5, 6]

i

main
	a $= [1, 2, 3]
	b $= [4, 5, 6]

	print(a + b)
}

=={{header|Icon}} and {{header|Unicon}}== Both languages have list concatenation built in. Lists are fully dynamic arrays which can be truncated or extended at either end.

procedure main()
    L1 := [1, 2, 3, 4]
    L2 := [11, 12, 13, 14]
    L3 := L1 ||| L2

    sep := ""
    every writes(sep, !L3) do
        sep := ", "
    write()
end

IDL

Array concatenation can mean different things, depending on the number of dimensions of the arguments and the result. In the simplest case, with 1-dimensional arrays to begin with, there are two obvious ways to concatenate them. If my arrays are these:

 > a = [1,2,3]
 > b = [4,5,6]
 > help,a
      A               INT       = Array[3]
 > help,b
      B               INT       = Array[3]
 > print,a
      1       2       3
 > print,b
      4       5       6

Then they can be concatenated "at the ends":

 > help,[a,b]
      <Expression>    INT       = Array[6]
 > print,[a,b]
       1       2       3       4       5       6

or "at the sides":

 > help,[[a],[b]]
      <Expression>    INT       = Array[3, 2]
 > print,[[a],[b]]
       1       2       3
       4       5       6

Note that this requires that the arrays have the same size at the side at which they are concatenated:

 > b = transpose(b)
 > help,b
      B               INT       = Array[1, 3]
 > print,b
       4
       5
       6
 > print,[a,b]
 Unable to concatenate variables because the dimensions do not agree: B.
 Execution halted at: $MAIN$
 > print,[[a],[b]]
 Unable to concatenate variables because the dimensions do not agree: B.
 Execution halted at: $MAIN$

This can get a lot more complicated as a 3x4x5-element three-dimensional array can be concatenated with a 5x2x3-element array at exactly two "surfaces".

Idris

Idris will disambiguate functions based on type, so both List (arbitrary length) and Vect (fixed length) can be concatenated in the same way:

Idris> [1, 2] ++ [4, 5, 6]
[1, 2, 3, 4, 5] : List Integer
Idris> :module Data.Vect
*Data/Vect> (the (Vect 2 Nat) [1, 2]) ++ (the (Vect 3 Nat) [3, 4, 5])
[1, 2, 3, 4, 5] : Vect 5 Nat

Inform 7

let A be {1, 2, 3};
let B be {4, 5, 6};
add B to A;

Ioke

 [1,2,3] + [3,2,1]
[1,2,3] + [3,2,1]
+> [1, 2, 3, 3, 2, 1]

J

'''Solution''': ,

'''Example''':

   array1 =: 1 2 3
   array2 =: 4 5 6
   array1 , array2
1 2 3 4 5 6

Of course, in J, array concatenation works (consistently) on arrays of any rank or dimension.

The verb , concatenates by treating the argument array with the largest number of dimensions as a list. Other primary verbs concatenate along other axes.

   ]ab=: 3 3 $ 'aaabbbccc'
aaa
bbb
ccc
   ]wx=: 3 3 $ 'wxyz'
wxy
zwx
yzw
   ab , wx
aaa
bbb
ccc
wxy
zwx
yzw
   ab ,. wx
aaawxy
bbbzwx
cccyzw
   ab ,: wx
aaa
bbb
ccc

wxy
zwx
yzw
   $ ab , wx    NB. applies to first (highest) axis
6 3
   $ ab ,. wx   NB. applies to last (atomic) axis
3 6
   $ ab ,: wx   NB. applies to new (higher) axis
2 3 3

Java

public static Object[] concat(Object[] arr1, Object[] arr2) {
    Object[] res = new Object[arr1.length + arr2.length];

    System.arraycopy(arr1, 0, res, 0, arr1.length);
    System.arraycopy(arr2, 0, res, arr1.length, arr2.length);

    return res;
}

JavaScript

The Array.concat() method returns a new array comprised of this array joined with other array(s) and/or value(s).

var a = [1,2,3],
    b = [4,5,6],
    c = a.concat(b); //=> [1,2,3,4,5,6]

Or, if we consider the concatenation of two arrays as a particular instance of the more general problem of concatenating 2 or more arrays, we can write a generic function:

{{trans|Haskell}} See, for a function with an analogous type signature, '''concat''' in the Haskell Prelude.

(function () {
    'use strict';

    // concat :: [[a]] -> [a]
    function concat(xs) {
        return [].concat.apply([], xs);
    }


   return concat(
      [["alpha", "beta", "gamma"],
      ["delta", "epsilon", "zeta"],
      ["eta", "theta", "iota"]]
  );

})();

{{Out}}

["alpha", "beta", "gamma", "delta", "epsilon", "zeta", "eta", "theta", "iota"]

jq

If a and b are two arrays, then a+b is their concatenation. Similarly for a+b+c.

To concatenate the component arrays of an array, A, the add filter can be used: A|add

jq also supports streams, which are somewhat array-like, so it may be worth mentioning that the concatenation of two or more streams can be accomplished using "," instead of "+".

[1,2] + [3] + [null] # => [1,2,3,null]

[range(1;3), 3, null] # => [1,2,3,null]

Julia

a = [1,2,3]
b = [4,5,6]
ab = [a;b]
# the above bracket notation simply generates a call to vcat
ab = vcat(a,b)
# hcat is short for `horizontal concatenation`
ab = hcat(a,b) 	#ab -> 3x2 matrix
# the append!(a,b) method is mutating, appending `b` to `a`
append!(a,b)	# a now equals [1,2,3,4,5,6]

K

    a: 1 2 3
    b: 4 5 6
    a,b
1 2 3 4 5 6

Concatenations on larger dimensions also use ",", often combined with other operations.

   ab:3 3#"abcdefghi"
("abc"
 "def"
 "ghi")

   dd:3 3#"012345678"
("012"
 "345"
 "678")

   ab,dd
("abc"
 "def"
 "ghi"
 "012"
 "345"
 "678")

   +ab,dd   / flip (transpose) join
("adg036"
 "beh147"
 "cfi258")

   ab,'dd   / eachpair join
("abc012"
 "def345"
 "ghi678")

   +(+ab),dd
("abc036"
 "def147"
 "ghi258")

Klong

    [1 2 3],[4 5 6]               :" join "
[1 2 3 4 5 6]

    [1 2],:\[[3 4] [5 6] [7 8]]   :" join each-left "
[[1 2 3 4] [1 2 5 6] [1 2 7 8]]

    [1 2],:/[[3 4] [5 6] [7 8]]   :" join each-right "
[[3 4 1 2] [5 6 1 2] [7 8 1 2]]

Kotlin

There is no operator or standard library function for concatenating Array types. One option is to convert to Collections, concatenate, and convert back:

fun main(args: Array<String>) {
    val a: Array<Int> = arrayOf(1, 2, 3) // initialise a
    val b: Array<Int> = arrayOf(4, 5, 6) // initialise b
    val c: Array<Int> = (a.toList() + b.toList()).toTypedArray()
    println(c)
}

Alternatively, we can write our own concatenation function:

fun arrayConcat(a: Array<Any>, b: Array<Any>): Array<Any> {
    return Array(a.size + b.size, { if (it in a.indices) a[it] else b[it - a.size] })
}

When working directly with Collections, we can simply use the + operator:

fun main(args: Array<String>) {
    val a: Collection<Int> = listOf(1, 2, 3) // initialise a
    val b: Collection<Int> = listOf(4, 5, 6) // initialise b
    val c: Collection<Int> = a + b
    println(c)
}

LabVIEW

Use the Build Array function.
{{VI snippet}}
[[File:LabVIEW_Array_concatenation.png]]

Lang5

[1 2] [3 4] append collapse .

Lasso

local(arr1 = array(1, 2, 3))
local(arr2 = array(4, 5, 6))
local(arr3 = #arr1->asCopy)	//	make arr3 a copy of arr2
#arr3->merge(#arr2)		//	concatenate 2 arrays


Result:

arr1 = array(1, 2, 3)
arr2 = array(4, 5, 6)
arr3 = array(4, 5, 6)
arr3 = array(1, 2, 3, 4, 5, 6)

LFE

> (++ '(1 2 3) '(4 5 6))
(1 2 3 4 5 6)
> (: lists append '(1 2 3) '(4 5 6))
(1 2 3 4 5 6)

Liberty BASIC

    x=10
    y=20
    dim array1(x)
    dim array2(y)

[concatenate]
    dim array3(x + y)
    for i = 1 to x
        array3(i) = array1(i)
    next
    for i = 1 to y
        array3(i + x) = array2(i)
    next

[print]
    for i = 1 to x + y
        print array3(i)
    next

LIL

LIL uses lists instead of arrays. The builtin '''append''' command could be used as '''append a $b'''. That would add the entire list in variable '''b''' as one item to list '''a'''. Below '''quote''' is used to flatten the lists into a single new list of all items.

##
  Array concatenation in LIL
##
set a [list 1 2 3]
set b [list 4 5 6]
set c [quote $a $b]

print $c
print "[index $c 0] [index $c 3]"

{{out}}

prompt$ lil arrayConcatenation.lil
1 2 3 4 5 6
1 4

Limbo

implement Command;

include "sys.m";
sys: Sys;

include "draw.m";

include "sh.m";

init(nil: ref Draw->Context, nil: list of string)
{
	sys = load Sys Sys->PATH;

	a := array[] of {1, 2};
	b := array[] of {3, 4, 5};

	c := array[len a + len b] of int;
	c[:] = a;
	c[len a:] = b;

	for (i := 0; i < len c; i++)
		sys->print("%d\n", c[i]);
}

Lingo

a = [1,2]
b = [3,4,5]

repeat with v in b
  a.append(v)
end repeat

put a
-- [1, 2, 3, 4, 5]

Little

void main() {
    int a[] = {0, 1, 2, 3, 4};
    int b[] = {5, 6, 7, 8, 9};
    int c[] = {(expand)a, (expand)b};
    puts(c);
}

Logo

COMBINE is used to combine lists or words. SENTENCE is used to combine lists and words into a single list.

to combine-arrays :a1 :a2
  output listtoarray sentence arraytolist :a1 arraytolist :a2
end
show combine-arrays {1 2 3} {4 5 6}   ; {1 2 3 4 5 6}

Lua

a = {1, 2, 3}
b = {4, 5, 6}

for _, v in pairs(b) do
    table.insert(a, v)
end

print(table.concat(a, ", "))

{{out}}

1, 2, 3, 4, 5, 6

Maple

There is a built-in procedure for concatenating arrays (and similar objects such as matrices or vectors). Arrays can be concatenated along any given dimension, which is specified as the first argument.

> A := Array( [ 1, 2, 3 ] );
                             A := [1, 2, 3]

> B := Vector['row']( [ sin( x ), cos( x ), tan( x ) ] );
                     B := [sin(x), cos(x), tan(x)]

> ArrayTools:-Concatenate( 1, A, B ); # stack vertically
                      [  1         2         3   ]
                      [                          ]
                      [sin(x)    cos(x)    tan(x)]

> ArrayTools:-Concatenate( 2, A, B ); # stack horizontally
                   [1, 2, 3, sin(x), cos(x), tan(x)]

> M := << a, b, c ; d, e, f >>; # a matrix
                                [a    b    c]
                           M := [           ]
                                [d    e    f]

> ArrayTools:-Concatenate( 1, M, A );
                             [a    b    c]
                             [           ]
                             [d    e    f]
                             [           ]
                             [1    2    3]

Of course, the order of the arguments is important.

> ArrayTools:-Concatenate( 1, A, M );
                             [1    2    3]
                             [           ]
                             [a    b    c]
                             [           ]
                             [d    e    f]

Lists, in Maple, might be considered to be a kind of "array" (in the sense that they look like arrays in memory), though they are actually immutable objects. However, they can be concatenated as follows.

> L1 := [ 1, 2, 3 ];
                            L1 := [1, 2, 3]

> L2 := [ a, b, c ];
                            L2 := [a, b, c]

> [ op( L1 ), op( L2 ) ];
                           [1, 2, 3, a, b, c]

> [ L1[], L2[] ]; # equivalent, just different syntax
                           [1, 2, 3, a, b, c]

M2000 Interpreter

a=(1,2,3,4,5)
b=Cons(a, (6,7,8),a)
Print b
1 2 3 4 5 6 7 8 1 2 3 4 5

Adding 2 dimension arrays

Dim Base 0, A(2,2)=1, B(1,2)=6
A()=Cons(A(), B(), A(), B())
\\ Restore the dimensions (without erasing items)
Dim A(Dimension(A(),1)/2, 2)
For I=0 to Dimension(A(),1)-1 {
      For j=0 to Dimension(A(),2)-1 {
            Print A(i, j),
      }
      Print
}

{{out}}

    1    1
    1    1
    6    6
    1    1
    1    1
    6    6
</pre >

=={{header|Mathematica}} / {{header|Wolfram Language}}==

```Mathematica
Join[{1,2,3}, {4,5,6}]

-> {1, 2, 3, 4, 5, 6}

=={{header|MATLAB}} / {{header|Octave}}== Two arrays are concatenated by placing the two arrays between a pair of square brackets. A space between the two array names will concatenate them horizontally, and a semi-colon between array names will concatenate vertically.

 a = [1 2 3]

a =

     1     2     3

>> b = [4 5 6]

b =

     4     5     6

>> concat = [a b]

concat =

     1     2     3     4     5     6

>> concat = [a;b]

concat =

     1     2     3
     4     5     6

For multi-dimensional arrays, there is also the function cat():

 c = randn([3,4,5]);
>> d = randn([3,4,7]);
>> e = cat(3,c,d);
>> size(e)
   ans =

    3    4   12

Maxima

u: [1, 2, 3, 4]$ v: [5, 6, 7, 8, 9, 10]$ append(u, v); /* [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] */

/* There are also functions for matrices */

a: matrix([6, 1, 8], [7, 5, 3], [2, 9, 4])$

addcol(a, ident(3)); /* matrix([6, 1, 8, 1, 0, 0], [7, 5, 3, 0, 1, 0], [2, 9, 4, 0, 0, 1]) */

addrow(a, ident(3)); /* matrix([6, 1, 8], [7, 5, 3], [2, 9, 4], [1, 0, 0], [0, 1, 0], [0, 0, 1]) */

## Mercury



```Mercury
A `append` B = C

It ''could'' be "as simple as array1 + array2", but the 'array' module names the operation 'append' rather than '+'. It's tempting to just say that Mercury supports ad-hoc polymorphism - it can infer that a bare '+' refers to 'float.+' or 'int.+' (or that the 'append' above is array.append, rather than list.append), by the types involved - but it also handles other ambiguities in the same way. For instance, Mercury (like Prolog and Erlang) treats the arity of a function as part of its name, where ''a(1, 2)'' and ''a(1)'' involve the distinct functions a/2 and a/1. But Mercury also (unlike Prolog and Erlang) supports [[currying]], where ''a(1)'' is a function that accepts a/2's second argument. So, is ''[a(X), a(Y), a(Z)]'' a list of whatever type a/1 evaluates to, or is it a list of curried a/2?

min

{{works with|min|0.19.3}}

(1 2 3) (4 "apple" 6) concat print

{{out}}

(1 2 3 4 "apple" 6)

MiniScript

arrOne = [1, 2, 3]
arrTwo = [4, 5, 6]
print arrOne + arrTwo

Neko

/*
 Array concatenation, in Neko
*/

var a1 = $array(1,2,3,4)
var a2 = $array("abc", "def")

/* $array(a1, a2) creates an array of two arrays, $aconcat merges to one */
var ac = $aconcat($array(a1, a2))
$print(ac, "\n")

{{out}}

prompt$ nekoc array-concatenation.neko
prompt$ neko array-concatenation.n
[1,2,3,4,abc,def]

Nemerle

using System.Console;
using Nemerle.Collections;

module ArrayCat
{
    Main() : void
    {
        def arr1 = array[1, 2, 3]; def arr2 = array[4, 5, 6];
        def arr12 = arr1.Append(arr2);                       // <----
        foreach (i in arr12) Write($"$i  ");
    }
}

NetRexx

NetRexx arrays are identical to [[Java|Java's]] so all the techniques described in the [[#Java|Java]] section apply to NetRexx too. This example uses the Collection classes to merge two arrays.

/* NetRexx */
options replace format comments java crossref nobinary

cymru =  [ 'Ogof Ffynnon Ddu', 'Ogof Draenen' ]

dlm = '-'.copies(40)

say dlm
loop c_ = 0 to cymru.length - 1
  say c_ cymru[c_]
  end c_

yorks = [ 'Malham Tarn Pot', 'Greygill Hole' ]

say dlm
loop y_ = 0 to yorks.length - 1
  say y_ yorks[y_]
  end y_

merge = ArrayList()
merge.addAll(Arrays.asList(cymru))
merge.addAll(Arrays.asList(yorks))

say dlm
merged = merge.toArray()
loop m_ = 0 to merged.length - 1
  say m_ merged[m_]
  end m_

{{out}}

----------------------------------------
0 Ogof Ffynnon Ddu
1 Ogof Draenen
----------------------------------------
0 Malham Tarn Pot
1 Greygill Hole
----------------------------------------
0 Ogof Ffynnon Ddu
1 Ogof Draenen
2 Malham Tarn Pot
3 Greygill Hole

NewLISP

; file:   arraycon.lsp
; url:    http://rosettacode.org/wiki/Array_concatenation
; author: oofoe 2012-01-28

(println "Append lists:  " (append '(3 a 5 3) (sequence 1 9)))

(println "Multi append:  "
         (append '(this is)
                 '(a test)
                 '(of the emergency)
                 (sequence 3 1)))

(println "Append arrays: "
         (append '((x 56) (b 99)) '((z 34) (c 23) (r 88))))

(exit)

{{out}}

Append lists:  (3 a 5 3 1 2 3 4 5 6 7 8 9)
Multi append:  (this is a test of the emergency 3 2 1)
Append arrays: ((x 56) (b 99) (z 34) (c 23) (r 88))

Nial

Examples tested to work with Q'Nial7

    a:= 1 2 3
+-+-+-+
|1|2|3|
+-+-+-+
    b:= 4 5 6
+-+-+-+
|4|5|6|
+-+-+-+

Table of lists:

    a b

+-------+-------+
|+-+-+-+|+-+-+-+|
||1|2|3|||4|5|6||
|+-+-+-+|+-+-+-+|
+-------+-------+

Simple concatenation of two arrays/lists:

    link a b
+-+-+-+-+-+-+
|1|2|3|4|5|6|
+-+-+-+-+-+-+

Convert list of lists to table:

    mix a b
+-+-+-+
|1|2|3|
+-+-+-+
|4|5|6|
+-+-+-+

Interchange levels of a list of lists:

    pack a b
+-----+-----+-----+
|+-+-+|+-+-+|+-+-+|
||1|4|||2|5|||3|6||
|+-+-+|+-+-+|+-+-+|
+-----+-----+-----+

Nim

Dynamic sized Sequences can simply be concatenated:

var
  x = @[1,2,3,4,5,6]
  y = @[7,8,9,10,11]
  z = x & y

Static sized Arrays:

var
  a = [1,2,3,4,5,6]
  b = [7,8,9,10,11]
  c: array[11, int]

c[0..5] = a
c[6..10] = b

=={{header|Oberon-2}}==

MODULE ArrayConcat;
IMPORT
  Out;
TYPE
  IntArray = POINTER TO ARRAY OF INTEGER;
VAR
  x, y, z: IntArray;

  PROCEDURE InitArray(VAR x: IntArray;from: INTEGER);
  VAR
    i: LONGINT;
  BEGIN
    FOR i := 0 TO LEN(x^) - 1 DO
      x[i] := from;
      INC(from)
    END
  END InitArray;

  PROCEDURE Concat(x,y: IntArray; VAR z: IntArray);
  VAR
    i: LONGINT;
  BEGIN
    ASSERT(LEN(x^) + LEN(y^) <= LEN(z^));
    FOR i := 0 TO LEN(x^) - 1 DO z[i] := x[i] END;
    FOR i := 0 TO LEN(y^) - 1 DO z[i + LEN(x^)] := y[i] END
  END Concat;

  PROCEDURE Show(x: IntArray);
  VAR
    i: INTEGER;
  BEGIN
    i := 0;
    Out.Char('[');
    WHILE (i < LEN(x^)) DO
      Out.LongInt(x[i],3);IF i < LEN(x^) - 1 THEN Out.Char(',') END;
      INC(i)
    END;
    Out.Char(']');Out.Ln
  END Show;

BEGIN
  (* Standard types *)
  NEW(x,5);InitArray(x,1);
  NEW(y,10);InitArray(y,6);
  NEW(z,LEN(x^) + LEN(y^));

  Concat(x,y,z);
  Show(z)

END ArrayConcat.

{{out}}

[  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15]

Objeck

bundle Default {
  class Arithmetic {
     function : Main(args : String[]) ~ Nil {
       array1 := [3, 5, 7];
       array2 := [2, 4, 6];

       array3 := Copy(array1, array2);
       each(i : array3) {
         array3[i]->PrintLine();
       };
  }

  function : native : Copy(array1 : Int[], array2 : Int[]) ~ Int[] {
     max := array1->Size() + array2->Size();
     array3 := Int->New[max];

     i := 0;
     for(i := i; i < array1->Size(); i += 1;) {
       array3[i] := array1[i];
     };

     j := 0;
     for(i := i; i < max; i += 1;) {
       array3[i] := array2[j];
       j += 1;
     };

      return array3;
    }
  }
}

=={{header|Objective-C}}== with immutable arrays:

NSArray *arr1 = @[@1, @2, @3];
NSArray *arr2 = @[@4, @5, @6];
NSArray *arr3 = [arr1 arrayByAddingObjectsFromArray:arr2];

or adding onto a mutable array:

NSArray *arr1 = @[@1, @2, @3];
NSArray *arr2 = @[@4, @5, @6];
NSMutableArray *arr3 = [NSMutableArray arrayWithArray:arr1];
[arr3 addObjectsFromArray:arr2];

OCaml

It is more natural in OCaml to use lists instead of arrays:

# let list1 = [1; 2; 3];;
val list1 : int list = [1; 2; 3]
# let list2 = [4; 5; 6];;
val list2 : int list = [4; 5; 6]
# let list1and2 = list1 @ list2;;
val list1and2 : int list = [1; 2; 3; 4; 5; 6]

If you want to use arrays:

# let array1 = [|1; 2; 3|];;
val array1 : int array = [|1; 2; 3|]
# let array2 = [|4; 5; 6|];;
val array2 : int array = [|4; 5; 6|]
# let array1and2 = Array.append array1 array2;;
val array1and2 : int array = [|1; 2; 3; 4; 5; 6|]

Oforth

import: mapping

[1, 2, 3 ] [ 4, 5, 6, 7 ] +

Onyx

# With two arrays on the stack, cat pops
# them, concatenates them, and pushes the result back
# on the stack. This works with arrays of integers,
# strings, or whatever. For example,

[1 2 3] [4 5 6] cat # result: [1 2 3 4 5 6]
[`abc' `def'] [`ghi' `jkl'] cat # result: [`abc' `def' `ghi' `jkl']

# To concatenate more than two arrays, push the number of arrays
# to concatenate onto the stack and use ncat. For example,

[1 true `a'] [2 false `b'] [`3rd array'] 3 ncat
# leaves [1 true `a' 2 false `b' `3rd array'] on the stack

ooRexx

a = .array~of(1,2,3)
say "Array a has " a~items "items"
b = .array~of(4,5,6)
say "Array b has " b~items "items"
a~appendall(b)        -- adds all items from b to a
say "Array a now has " a~items "items"

{{out}}

Array a has  3 items
Array b has  3 items
Array a now has  6 items

Order

Order supports two main aggregate types: tuples and sequences (similar to lists in other languages). Most "interesting" operations are limited to sequences, but both support an append operation, and each can be converted to the other.

#include <order/interpreter.h>

ORDER_PP( 8tuple_append(8tuple(1, 2, 3), 8tuple(4, 5, 6), 8pair(7, 8)) )
// -> (1,2,3,4,5,6,7,8)

ORDER_PP( 8seq_append(8seq(1, 2, 3), 8seq(4, 5, 6), 8seq(7, 8)) )
// -> (1)(2)(3)(4)(5)(6)(7)(8)

OxygenBasic

'CREATE DYNAMIC ARRAY SPACES USING STRINGS

string sa=nuls 5* sizeof float
string sb=sa

'MAP ARRAY VARIABLES ONTO STRINGS

float a at *sa
float b at *sb

'ASSIGN SOME VALUES

a<=10,20,30,40,50
b<=60,70,80,90,00

'ADD ARRAY B TO A BY STRING CONCATENATION

sa+=sb

'TEST

print a[7] 'result 70

Oz

List are concatenated with List.append (shortcut: Append). Tuples are concatened with Tuple.append. Arrays do exist in Oz, but are rarely used.

%% concatenating 2 lists
{Append [a b] [c d]} = [a b c d]

%% concatenating 2 tuples
{Tuple.append t(1 2 3) u(4 5 6)} = u(1 2 3 4 5 6)

PARI/GP

concat(u,v)

Pascal

''See [[#Delphi|Delphi]] and [[#Free Pascal|Free Pascal]]''

Perl

In Perl, arrays placed into list context are flattened:

my @arr1 = (1, 2, 3);
my @arr2 = (4, 5, 6);
my @arr3 = (@arr1, @arr2);

The [http://perldoc.perl.org/functions/push.html push] function appends elements onto an existing array:

my @arr1 = (1, 2, 3);
my @arr2 = (4, 5, 6);
push @arr1, @arr2;
print "@arr1\n"; # prints "1 2 3 4 5 6"

Perl 6

{{works with|Rakudo|2018.06}}

my @array1 = 1, 2, 3;
my @array2 = 4, 5, 6;

# If you want to concatenate two array to form a third,
# either use the slip operator "|", to flatten each array.

my @array3 = |@array1, |@array2;
say @array3;

# or just flatten both arrays in one fell swoop

@array3 = flat @array1, @array2;
say @array3;

# On the other hand, if you just want to add the elements
# of the second array to the first, use the .append method.

say @array1.append: @array2;

{{Out}}

[1 2 3 4 5 6]
[1 2 3 4 5 6]
[1 2 3 4 5 6]

Phix

sequence s1 = {1,2,3}, s2 = {4,5,6}
? s1 & s2

{{out}}

 {1,2,3,4,5,6}

PHP

$arr1 = array(1, 2, 3);
$arr2 = array(4, 5, 6);
$arr3 = array_merge($arr1, $arr2);

PicoLisp

PicoLisp has no built-in array data type. Lists are used instead.

There are destructive concatenations:

: (setq  A (1 2 3)  B '(a b c))
-> (a b c)
: (conc A B)                        # Concatenate lists in 'A' and 'B'
-> (1 2 3 a b c)
: A
-> (1 2 3 a b c)                    # Side effect: List in 'A' is modified!

and non-destructive concatenations:

: (setq  A (1 2 3)  B '(a b c))
-> (a b c)
: (append A B)                      # Append lists in 'A' and 'B'
-> (1 2 3 a b c)
: A
-> (1 2 3)
: B
-> (a b c)                          # Arguments are not modified

PL/I

Trivial example requires no computational statement. Note that the arrays are not in static storage:

   declare x(12) fixed;
   declare b(5) fixed defined x;
   declare c(7) fixed defined x(1sub+5);

A more general example using dynamic bounds. Again, no computation statement is required. declare x(m+n) fixed; declare b(m) fixed defined x; declare c(n) fixed defined x(1sub+hbound(b,1));

An alternative, that can be used to advantage for matrices
as well as vectors, follows.  This example illustrates
extending a matrix diagonally.  Although fixed array bounds
are used in the declarations, the bounds can be dynamic.
Matrix B is extended by placing matrix C on its diagonal:
<lang>
   declare a(5,6) fixed;
   declare b(3,4) fixed defined a(1sub, 2sub);
   declare c(2,2) fixed defined a(1sub+hbound(b,1), 2sub+hbound(b,2));
   declare (i, j, k) fixed;

   a = 0;
   put skip list ('Please type elements for a 3 x 4 matrix:');
   get list (b);
   put skip list ('Please type elements for a 2 x 2 matrix:');
   get list (c);
   put skip edit (c) ( skip, (hbound(c,2)) f(5,0) );

   put skip list ('Composite matrix:');
   put skip edit (a) ( skip, (hbound(a,2)) f(5,0) );

{{out}} Please type elements for a 3 x 4 matrix:

Please type elements for a 2 x 2 matrix:

13 14 15 16 Composite matrix:

1    2    3    4    0    0
5    6    7    8    0    0
9   10   11   12    0    0
0    0    0    0   13   14
0    0    0    0   15   16

## Pony


```pony

actor Main
    new create(env:Env)=>
        var a:Array[I32]=Array[I32](4)
        var b:Array[I32]=Array[I32](2)
        a.push(1)
        a.push(2)
        a.push(3)
        a.push(4)
        b.push(5)
        b.push(6)
        a.concat(b.values())
        for i in a.values() do
            env.out.print(i.string())
        end

PostScript

{{libheader|initlib}}

[1 2 3 4] [5 6 7 8] concat

PowerShell

$a = 1,2,3
$b = 4,5,6

$c = $a + $b
Write-Host $c

Prolog

?- append([1,2,3],[4,5,6],R).
R = [1, 2, 3, 4, 5, 6].

PureBasic

Procedure displayArray(Array a(1), msg.s)
  Protected i
  Print(msg + " [")
  For i = 0 To ArraySize(a())
    Print(Str(a(i)))
    If i <> ArraySize(a())
      Print(", ")
    EndIf
  Next
  PrintN("]")
EndProcedure

Procedure randomElements(Array a(1), lo, hi)
  Protected i
  For i = 0 To ArraySize(a())
    a(i) = random(hi - lo) + lo
  Next
EndProcedure

Procedure arrayConcat(Array a(1), Array b(1), Array c(1))
  Protected i, newSize = ArraySize(a()) + ArraySize(b()) + 1
  Dim c(newSize)
  For i = 0 To ArraySize(a())
    c(i) = a(i)
  Next
  For i = 0 To ArraySize(b())
    c(i + ArraySize(a()) + 1) = b(i)
  Next
EndProcedure


If OpenConsole()
  Dim a(random(3) + 1)
  Dim b(random(3) + 1)
  Dim c(0) ;array will be resized by arrayConcat()

  randomElements(a(), -5, 5)
  randomElements(b(), -5, 5)
  displayArray(a(), "a:")
  displayArray(b(), "b:")
  arrayConcat(a(), b(), c())
  displayArray(c(), "concat of a[] + b[]:")

  Print(#CRLF$ + #CRLF$ + "Press ENTER to exit")
  Input()
  CloseConsole()
EndIf

{{out}}

a: [5, 2, -4, -1, -2]
b: [0, -4, -1]
concat of a[] + b[]: [5, 2, -4, -1, -2, 0, -4, -1]

Python

The [http://docs.python.org/library/stdtypes.html#sequence-types-str-unicode-list-tuple-buffer-xrange +] operator concatenates two lists and returns a new list. The [http://docs.python.org/library/stdtypes.html#mutable-sequence-types list.extend] method appends elements of another list to the receiver.

arr1 = [1, 2, 3]
arr2 = [4, 5, 6]
arr3 = [7, 8, 9]
arr4 = arr1 + arr2
assert arr4 == [1, 2, 3, 4, 5, 6]
arr4.extend(arr3)
assert arr4 == [1, 2, 3, 4, 5, 6, 7, 8, 9]

Note: list.extend is normally accomplished using the += operator like this:

arr5 = [4, 5, 6]
arr6 = [7, 8, 9]
arr6 += arr5
assert arr6 == [7, 8, 9, 4, 5, 6]

Q

list1:1 2 3
list2:4 5 6
list1,list2

R

a1 <- c(1, 2, 3)
a2 <- c(3, 4, 5)
a3 <- c(a1, a2)

Racket

(vector-append #(1 2 3 4) #(5 6 7) #(8 9 10))

{{out}}

'#(1 2 3 4 5 6 7 8 9 10)

RapidQ

DEFINT A(1 to 4) = {1, 2, 3, 4}
DEFINT B(1 to 4) = {10, 20, 30, 40}

'Append array B to array A
Redim A(1 to 8) as integer
MEMCPY(varptr(A(5)), varptr(B(1)), Sizeof(integer)*4)

REBOL

a1: [1 2 3]
a2: [4 5 6]
a3: [7 8 9]

append a1 a2 ; -> [1 2 3 4 5 6]

append/only a1 a3 ; -> [1 2 3 4 5 6 [7 8 9]]

Red

 arr1: ["a" "b" "c"]
>> arr2: ["d" "e" "f"]
>> append arr1 arr2
== ["a" "b" "c" "d" "e" "f"]
>> arr3: [1 2 3]
>> insert arr1 arr3
>> arr1
== [1 2 3 "a" "b" "c" "d" "e" "f"]
>> arr4: [22 33 44]
== [22 33 44]
>> append/only arr1 arr4
== [1 2 3 "a" "b" "c" "d" "e" "f" [22 33 44]]

Retro

needs array'

^array'new{ 1 2 3 }  ^array'new{ 4 5 6 }  ^array'append

REXX

REXX doesn't have arrays as such, but it has something that looks, feels, and tastes like arrays: ::::* stemmed variables

Simply, a stemmed array is a variable with an appended dot ('''.''') followed by a symbol (it's normally an integer or an alphanumeric name).

There is no way to preallocate a stemmed variable, REXX just assigns them as they are created (assigned a value).

As such, there isn't an easy way to keep track of the number of "elements" in a REXX "array" (unless the programmer maintains a list).

Consider:

a.1 =  10
a.2 =  22.7
a.7 = -12

where now we have three "elements", and they are disjointed (another word for ''sparse'').

There are ways to handle this in REXX however.

When assigning stemmed arrays, it is common to assign "element" zero to the number of values,

assuming that the stemmed variables are sequential.

'''example:'''

fact.0=8
fact.1=    1
fact.2=    2
fact.3=    6
fact.4=   24
fact.5=  120
fact.6=  720
fact.7= 5040
fact.8=40320

To concat two "arrays" in REXX, the following assumes that the stemmed variables are in order, with no gaps, and none have a "null" value.

/*REXX program to demonstrates how to perform array concatenation.*/

p.=                                    /*(below) a short list of primes.*/
p.1=2;    p.2=3;     p.3=5;     p.4=7;     p.5=11;   p.6=13
p.7=17;   p.8=19;    p.9=23;    p.10=27;   p.11=31;  p.12=37

f.=                                    /*(below) a list of Fibonacci #s.*/
f.0=0;f.1=1;f.2=1;f.3=2;f.4=3;f.5=5;f.6=8;f.7=13;f.8=21;f.9=34;f.10=55

             do j=1  while p.j\==''
             c.j=p.j                   /*assign C array with some primes*/
             end   /*j*/
n=j-1
             do k=0  while f.k\=='';   n=n+1
             c.n=f.k                   /*assign C array with fib numbers*/
             end   /*k*/
say 'elements=' n
say
             do m=1  for n
             say 'c.'m"="c.m           /*show a "merged"  C  array nums.*/
             end   /*m*/
                                       /*stick a fork in it, we're done.*/

{{out}}

elements= 23

c.1=2
c.2=3
c.3=5
c.4=7
c.5=11
c.6=13
c.7=17
c.8=19
c.9=23
c.10=27
c.11=31
c.12=37
c.13=0
c.14=1
c.15=1
c.16=2
c.17=3
c.18=5
c.19=8
c.20=13
c.21=21
c.22=34
c.23=55

Ring

arr1 = [1, 2, 3]
arr2 = [4, 5, 6]
arr3 = [7, 8, 9]
arr4 = arr1 + arr2
see arr4
see nl
arr5 = arr4 + arr3
see arr5

RLaB

In RLaB the matrices can be appended (column-wise) or stacked (row-wise). Consider few examples:

>> x = [1, 2, 3]
>> y = [4, 5, 6]
// appending matrix 'y' on the right from matrix 'x' is possible if the two matrices have
// the same number of rows:
>> z1 = [x, y]
matrix columns 1 thru 6
           1             2             3             4             5             6
// stacking matrix 'y' below the matrix 'x' is possible if the two matrices have
// the same number of columns:
>> z2  = [x; y]
           1             2             3
           4             5             6
>>

Ruby

The [http://www.ruby-doc.org/core/classes/Array.html#M002209 Array#+] method concatenates two arrays and returns a new array. The [http://www.ruby-doc.org/core/classes/Array.html#M002166 Array#concat] method appends elements of another array to the receiver.

arr1 = [1, 2, 3]
arr2 = [4, 5, 6]
arr3 = [7, 8, 9]
arr4 = arr1 + arr2  # => [1, 2, 3, 4, 5, 6]
arr4.concat(arr3)  # => [1, 2, 3, 4, 5, 6, 7, 8, 9]

Or use flatten(1):

# concat multiple arrays:
[arr1,arr2,arr3].flatten(1)
# ignore nil:
[arr1,arr2,arr3].compact.flatten(1)

Rust

fn main() {
    let a_vec = vec![1, 2, 3, 4, 5];
    let b_vec = vec![6; 5];

    let c_vec = concatenate_arrays(&a_vec, &b_vec);

    println!("{:?} ~ {:?} => {:?}", a_vec, b_vec, c_vec);
}

fn concatenate_arrays<T: Clone>(x: &[T], y: &[T]) -> Vec<T> {
    let mut concat = x.to_vec();
    concat.extend_from_slice(y);

    concat
}

Or, with iterators:

fn concatenate_arrays<T: Clone>(x: &[T], y: &[T]) -> Vec<T> {
    x.iter().chain(y).cloned().collect()
}

=={{header|S-lang}}== variable a = [1, 2, 3]; variable b = [4, 5, 6], c;

a+b is perfectly valid in S-Lang, but instead of the problem's desired effect,
it gives you a new array with each coorresponding element from a and b added.
But because arrays automatically 'flatten' when defined, concatenation is as
simple as:
<lang S-lang>c = [a, b];

Use of lists is more traditional; lists don't 'flatten', so we use either list_concat() to create a new concatenated array: a = {1, 2, 3}; b = {4, 5, 6}; c = list_concat(a, b);

or list_join():
<lang S-lang>list_join(a, b);

which adds the elements of b onto a.

SASL

In SASL, the concat operator ++ is built-in

(1 2 3) ++ (4 5 6)

Scala

val arr1 = Array( 1, 2, 3 )
val arr2 = Array( 4, 5, 6 )
val arr3 = Array( 7, 8, 9 )

arr1 ++ arr2 ++ arr3
//or:
Array concat ( arr1, arr2, arr3 )
// res0: Array[Int] = Array(1, 2, 3, 4, 5, 6, 7, 8, 9)

Scheme

; in r5rs, there is append for lists, but we'll need to define vector-append
(define (vector-append . arg) (list->vector (apply append (map vector->list arg))))

(vector-append #(1 2 3 4) #(5 6 7) #(8 9 10))
; #(1 2 3 4 5 6 7 8 9 10)

''Note : vector-append is also defined in [http://srfi.schemers.org/srfi-43/srfi-43.html SRFI-43].''

=== Concatening two-dimensional arrays === {{works with|Gauche Scheme}}

(use gauche.array)

(define (print-matrix m)
  (define row-num #f)
  (array-for-each-index m
    (lambda (row col)
      (when (and row-num (not (= row-num row))) (newline))
      (format #t "~a " (array-ref m row col))
      (set! row-num row)))
  (newline))

(define a
  #,(<array> (0 3 0 2)
      a b
      c d
      e f))

(define b
  #,(<array> (0 3 0 2)
      1 2
      3 4
      5 6))

(print-matrix (array-concatenate a b))
(print-matrix (array-concatenate a b 1))

{{out}}

a b
c d
e f
1 2
3 4
5 6

a b 1 2
c d 3 4
e f 5 6

Seed7

$ include "seed7_05.s7i";

var array integer: a is [] (1, 2, 3, 4);
var array integer: b is [] (5, 6, 7, 8);
var array integer: c is [] (9, 10);

const proc: main is func
  local
    var integer: number is 0;
  begin
    c := a & b;
    for number range c do
      write(number <& " ");
    end for;
    writeln;
  end func;

{{out}}

1 2 3 4 5 6 7 8

SETL

A := [1, 2, 3];
B := [3, 4, 5];
print(A + B); -- [1 2 3 3 4 5]

Sidef

var arr1 = [1, 2, 3];
var arr2 = [4, 5, 6];
var arr3 = (arr1 + arr2);   # => [1, 2, 3, 4, 5, 6]

Simula

BEGIN  ! Concatenate arrays - of REAL, here;

    CLASS REAL_ARRAY(N); INTEGER N;
    BEGIN
        REAL ARRAY DATA(1:N);

        ! Return a new REAL_ARRAY containing
        ! the values from this REAL_ARRAY
        ! followed by the values from other;
        REF(REAL_ARRAY) PROCEDURE CONCAT(other);
            REF(REAL_ARRAY) other;
        BEGIN
            REF(REAL_ARRAY) C;
            INTEGER I;

            C :- NEW REAL_ARRAY(N + other.N);

            FOR I := 1 STEP 1 UNTIL N DO
                C.DATA(I) := DATA(I);

            FOR I := 1 STEP 1 UNTIL other.N DO
                C.DATA(N + I) := other.DATA(I);

            CONCAT :- C;
        END;

        ! Fill DATA;
        REF(REAL_ARRAY) PROCEDURE linearFill(start, stride);
            REAL start, stride;
        BEGIN
            linearFillFrom(DATA, 1, N, start, stride);
            linearFill :- this REAL_ARRAY
        END;

        PROCEDURE out(sink); REF(printfile) sink;
        BEGIN
            INTEGER i;
            FOR i := 1 STEP 1 UNTIL N DO
                sink.OUTFIX(DATA(i), 2, 7);
            sink.OUTIMAGE;
        END;
    END REAL_ARRAY;

    ! "The problem" is not array as an input parameter:
    !  I don't know how to
    ! "pass a new ARRAY out of a PROCEDURE";
    REF(REAL_ARRAY) PROCEDURE concatenate(a, b);
        REAL ARRAY a, b;
    BEGIN
        INTEGER i, a_, N, b_, M;
        REF(REAL_ARRAY) c;
        a_ := LOWERBOUND(a, 1) - 1;
        N := UPPERBOUND(a, 1) - a_;
        b_ := LOWERBOUND(a, 1) - 1;
        M := UPPERBOUND(b, 1) - b_;
        c :- NEW REAL_ARRAY(N + M);

        FOR i := 1 STEP 1 UNTIL N DO
            c.DATA(i) := a(a_+i);
        ! for readability, don't
        !  reduce one index expression to a variable
        FOR i := 1 STEP 1 UNTIL M DO
            c.DATA(N + i) := b(b_+i);

        concatenate :- c;
    END concatenate REAL ARRAYs;

    ! two more convenience PROCEDUREs;
    PROCEDURE linearFillFrom(a, from, inclusive, start, stride);
            REAL ARRAY a; ! passed by reference;
            INTEGER from, inclusive;
            REAL start, stride;
    BEGIN
        INTEGER i;
        FOR i := from STEP 1 UNTIL inclusive DO
            a(i) := start + stride * (i - from)
    END;
    PROCEDURE linearFill(a, start, stride);
            REAL ARRAY a;
            REAL start, stride;
        linearFillFrom(a, LOWERBOUND(a, 1), UPPERBOUND(a, 1),
                       start, stride);


    REF(REAL_ARRAY) X;
    REAL ARRAY u(1:3), v(1:4);
    linearFill(u, 3, 7);
    linearFill(v, 0, 5);
    concatenate(u, v).out(SYSOUT);

    X :- NEW REAL_ARRAY(3).linearFill(1, 2);
    X.out(SYSOUT);
    X.CONCAT(NEW REAL_ARRAY(4)
                .linearFill(-1, -3)).out(SYSOUT);
END.

{{out}}

   3.00  10.00  17.00   0.00   5.00  10.00  15.00
   1.00   3.00   5.00
   1.00   3.00   5.00  -1.00  -4.00  -7.00 -10.00

Slate

The binary operation of concatenation is made with the ; (semi-colon) from the type Sequence. It is also available for appending Sequences to WriteStreams.

{1. 2. 3. 4. 5} ; {6. 7. 8. 9. 10}

Smalltalk

Concatenation (appending) is made with the method , (comma), present in classes SequenceableCollection, ArrayedCollection and their subclasses (e.g. Array, String, OrderedCollection ...)

|a b c|
a := #(1 2 3 4 5).
b := #(6 7 8 9 10).
c := a,b.
c displayNl.

SNOBOL4

{{works with|Macro Spitbol}} {{works with|Snobol4+}} {{works with|CSnobol}}

*       # Concatenate 2 arrays (vectors)
        define('cat(a1,a2)i,j') :(cat_end)
cat     cat = array(prototype(a1) + prototype(a2))
cat1    i = i + 1; cat<i> = a1<i> :s(cat1)
cat2    j = j + 1; cat<i - 1 + j> = a2<j> :s(cat2)f(return)
cat_end

*       # Fill arrays
        str1 = '1 2 3 4 5'; arr1 = array(5)
loop    i = i + 1; str1 len(p) span('0123456789') . arr1<i> @p :s(loop)
        str2 = '6 7 8 9 10'; arr2 = array(5)
loop2   j = j + 1; str2 len(q) span('0123456789') . arr2<j> @q :s(loop2)

*       # Test and display
        arr3 = cat(arr1,arr2)
loop3   k = k + 1; str3 = str3 arr3<k> ' ' :s(loop3)
        output = str1
        output = str2
        output = str3
end

{{out}}

1 2 3 4 5
6 7 8 9 10
1 2 3 4 5 6 7 8 9 10

Standard ML

val l1 = [1,2,3,4];;
val l2 = [5,6,7,8];;
val l3 = l1 @ l2 (* [1,2,3,4,5,6,7,8] *)

Stata

Macro language

. matrix a=2,9,4\7,5,3\6,1,8
. matrix list a

a[3,3]
    c1  c2  c3
r1   2   9   4
r2   7   5   3
r3   6   1   8

. matrix b=I(3)
. matrix list b

symmetric b[3,3]
    c1  c2  c3
r1   1
r2   0   1
r3   0   0   1

. matrix c=a,b
. matrix list c

c[3,6]
    c1  c2  c3  c1  c2  c3
r1   2   9   4   1   0   0
r2   7   5   3   0   1   0
r3   6   1   8   0   0   1

. matrix c=a\b
. matrix list c

c[6,3]
    c1  c2  c3
r1   2   9   4
r2   7   5   3
r3   6   1   8
r1   1   0   0
r2   0   1   0
r3   0   0   1

Mata

. mata
: a=2,9,4\7,5,3\6,1,8

: b=I(3)

: a,b
       1   2   3   4   5   6
    +-------------------------+
  1 |  2   9   4   1   0   0  |
  2 |  7   5   3   0   1   0  |
  3 |  6   1   8   0   0   1  |
    +-------------------------+

: a\b
       1   2   3
    +-------------+
  1 |  2   9   4  |
  2 |  7   5   3  |
  3 |  6   1   8  |
  4 |  1   0   0  |
  5 |  0   1   0  |
  6 |  0   0   1  |
    +-------------+

: end

Swift

let array1 = [1,2,3]
let array2 = [4,5,6]
let array3 = array1 + array2

Tcl

set a {1 2 3}
set b {4 5 6}
set ab [concat $a $b];   # 1 2 3 4 5 6

Note that in the Tcl language, “arrays” are hash maps of strings to variables, so the notion of concatenation doesn't really apply. What other languages (usually) call arrays are “lists” in Tcl.

=={{header|TI-89 BASIC}}==

If a and b are lists, augment(a, b) concatenates them in the usual fashion. If a and b are matrices, then augment(a, b) produces a matrix whose columns are the columns of a followed by the columns of b, i.e. an [[wp:augmented matrix|augmented matrix]].

■ augment({1,2}, {3,4})
{1,2,3,4}
■ augment([[1][2]], [[3][4]])
[[1,3][2,4]]


That last example as displayed in pretty-printing mode:

<math>\operatorname{augment} \left(\begin{bmatrix}1 \\ 2\end{bmatrix}, \begin{bmatrix}3 \\ 4\end{bmatrix}\right)</math>

:<math>\begin{bmatrix}
1 & 3 \\
2 & 4
\end{bmatrix}</math>

Concatenation in the other direction may of course be done by transposition:

<!--lang ti89b--><pre style="font-family: 'TI Uni';">
■ augment([[x][y]], [[z][w]])
    [[x][y][z][w]]

$\backslash left(\backslash operatorname\{augment\}\; \backslash left(\backslash begin\{bmatrix\}x\; \backslash \; y\backslash end\{bmatrix\}^\backslash mathrm\; T,\; \backslash begin\{bmatrix\}z\; \backslash \; w\backslash end\{bmatrix\}^\backslash mathrm\; T\backslash right)\backslash right)^\backslash mathrm\; T$
:$\backslash begin\{bmatrix\}\; x\; \backslash \; y\; \backslash \; z\; \backslash \; w\backslash end\{bmatrix\}$
Trith
[1 2 3] [4 5 6] concat
UNIX Shell
Using proper built-in Bash arrays:
{{works with|bash}}
array1=( 1 2 3 4 5 )
array2=( 6 7 8 9 10 )
botharrays=( ${array1[@]} ${array2[@]} )

Whitespace-delimited strings work in much the same way:
{{works with|bash}}
array1='1 2 3 4 5'
array2='6 7 8 9 10'

# Concatenated to a Bash array ...
botharrays_a=( $array1 $array2 )

# Concatenated to a string ...
botharrays_s="$array1 $array2"
Ursa
# create two streams (the ursa equivalent of arrays)
# a contains the numbers 1-10, b contains 11-20
decl int<> a b
decl int i
for (set i 1) (< i 11) (inc i)
        append i a
end for
for (set i 11) (< i 21) (inc i)
        append i b
end for

# append the values in b to a
append b a

# output a to the console
out a endl console
Vala
int[] array_concat(int[]a,int[]b){
	int[] c = new int[a.length + b.length];
	Memory.copy(c, a, a.length * sizeof(int));
	Memory.copy(&c[a.length], b, b.length * sizeof(int));
	return c;
}
void main(){
	int[] a = {1,2,3,4,5};
	int[] b = {6,7,8};
	int[] c = array_concat(a,b);
	foreach(int i in c){
		stdout.printf("%d\n",i);
	}
}
VBA

Option Explicit

Sub MainConcat_Array()
Dim Aray_1() As Variant, Aray_2() As Variant
Dim Result() As Variant

    Aray_1 = Array(1, 2, 3, 4, 5, #11/24/2017#, "azerty")
    Aray_2 = Array("A", "B", "C", 18, "End")
    Result = Concat_Array(Aray_1, Aray_2)
    Debug.Print "With Array 1 : " & Join(Aray_1, ", ")
    Debug.Print "And Array 2 : " & Join(Aray_2, ", ")
    Debug.Print "The result is Array 3 : " & Join(Result, ", ")
End Sub

Function Concat_Array(A1() As Variant, A2() As Variant) As Variant()
Dim TmpA1() As Variant, N As Long, i As Long

    N = UBound(A1) + 1
    TmpA1 = A1
    ReDim Preserve TmpA1(N + UBound(A2))
    For i = N To UBound(TmpA1)
        TmpA1(i) = A2(i - N)
    Next
    Concat_Array = TmpA1
End Function


{{out}}
With Array 1 : 1, 2, 3, 4, 5, 24/11/2017, azerty
And Array 2 : A, B, C, 18, End
The result is Array 3 : 1, 2, 3, 4, 5, 24/11/2017, azerty, A, B, C, 18, End

VBScript
Function ArrayConcat(arr1, arr2)
    ReDim ret(UBound(arr1) + UBound(arr2) + 1)
    For i = 0 To UBound(arr1)
        ret(i) = arr1(i)
    Next
    offset = Ubound(arr1) + 1
    For i = 0 To UBound(arr2)
        ret(i + offset) = arr2(i)
    Next
    ArrayConcat = ret
End Function

arr1 = array(10,20,30)
arr2 = array(40,50,60)
WScript.Echo "arr1 = array(" & Join(arr1,", ") & ")"
WScript.Echo "arr2 = array(" & Join(arr2,", ") & ")"
arr3 = ArrayConcat(arr1, arr2)
WScript.Echo "arr1 + arr2 = array(" & Join(arr3,", ") & ")"

{{out}}

arr1 = array(10, 20, 30)
arr2 = array(40, 50, 60)
arr1 + arr2 = array(10, 20, 30, 40, 50, 60)

Visual Basic .NET

    Dim iArray1() As Integer = {1, 2, 3}
    Dim iArray2() As Integer = {4, 5, 6}
    Dim iArray3() As Integer = Nothing

    iArray3 = iArray1.Concat(iArray2).ToArray

Wart
Wart doesn't have arrays yet, just lists.
a <- '(1 2 3)
b <- '(4 5 6)
a+b
# => (1 2 3 4 5 6)
Wren
var arr1 = [1,2,3]
var arr2 = [4,5,6]
for (e in arr2) {
    arr1.add(e)
}
System.print(arr1)


{{Out}}
[1, 2, 3, 4, 5, 6]
Yabasic
sub arrayConcatenation(a(), b())
	local ta, tb, nt, i

	ta = arraysize(a(), 1)
	tb = arraysize(b(), 1)

	nt = ta + tb

	redim a(nt)

	for i = ta + 1 to nt
		a(i) = b(i - ta)
	next i

	return nt
end sub

//
### =========================


SIZE = 5

dim a(SIZE)
dim b(SIZE)

for i = 1 to SIZE
	a(i) = i
	b(i) = i + SIZE
next i

nt = arrayConcatenation(a(), b())

for i = 1 to nt
	print a(i);
	if i < nt print ", ";
next i
print
Yacas
Concat({1,2,3}, {4,5,6})

Out> {1, 2, 3, 4, 5, 6}
Yorick
a = [1,2,3];
b = [4,5,6];
ab = grow(a, b);
zkl
Lists (both mutable and read only), no built in support for numeric vectors/arrays/matrices
T(1,2).extend(T(4,5,6)) //-->L(1,2,4,5,6)
T(1,2).extend(4,5,6)    //-->L(1,2,4,5,6)
zonnon

module Main;
import
	System.Collections.ArrayList as Array,
	System.Console as Console;
type
Vector =  array {math} * of integer;
procedure Concat(x,y: Vector): Vector;
var
i,k: integer;
res: Vector;
begin
res := new Vector(len(x) + len(y));
k := 0;
for i := 0 to len(x) - 1 do
res[k] := x[i];inc(k)
end;
for i := 0 to len(y) - 1 do
res[k] := y[i];inc(k)
end;
return res
end Concat;
procedure Concat2(x,y: Array): Array;
var
i: integer;
res: Array;
begin
res := new Array(x.Count + y.Count);
for i := 0 to x.Count - 1 do
res.Add(x[i]);
end;
for i := 0 to y.Count - 1 do
res.Add(y[i]);
end;
return res
end Concat2;
procedure WriteVec(x: Vector);
var
i: integer;
begin
for i := 0 to len(x) - 1 do;
write(x[i]:3)
end;
writeln;
end WriteVec;
procedure WriteAry(x: Array);
var
i: integer;
begin
for i := 0 to x.Count - 1 do;
Console.Write("{0,3}",x[i])
end;
writeln;
end WriteAry;
var
a,b: Vector;
x,y: Array;
begin
a := [1,2,3,4];
b := [6,7,8,9];
WriteVec(Concat(a,b));
x := new Array(4);
y := new Array(4);
x.Add(2);x.Add(4);x.Add(6);x.Add(8);
y.Add(3);y.Add(5);y.Add(9);y.Add(11);

WriteAry(Concat2(x,y));

end Main.

{{out}}

```txt

  1  2  3  4  6  7  8  9
  2  4  6  8  3  5  9 11

Zsh
Concatenating arrays.
a=(1 2 3)
b=(a b c)

c=($a $b)

Pushing a single element into an array.

Pushing another array into an array.

```zsh
a+=($b)
ZX Spectrum Basic
{{trans|Liberty BASIC}}
10 LET x=10
20 LET y=20
30 DIM a(x)
40 DIM b(y)
50 DIM c(x+y)
60 FOR i=1 TO x
70 LET c(i)=a(i)
80 NEXT i
90 FOR i=1 TO y
100 LET c(x+i)=b(i)
110 NEXT i
120 FOR i=1 TO x+y
130 PRINT c(i);", ";
140 NEXT i