How can I add elements of an array not the array itself?

Question

I have an first array and the second array with elements I want to add to the first array

arr1 = [ 1, 2, 3 ];
arr2 = [ 4, 5, 6 ];

arr1.push(arr2);  // [ 1, 2, 3, [ 4, 5, 6]]  but i need [ 1, 2, 3, 4, 5, 6 ]

How can I do it?

[concat](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/concat) is likely what you want to use — smcd, Dec 06 '20 at 18:28
[Duplicate](https://google.com/search?q=site%3Astackoverflow.com+js+merge+two+arrays) of [JavaScript: How to join / combine two arrays to concatenate into one array?](https://stackoverflow.com/a/3975179/4642212). — Sebastian Simon, Dec 06 '20 at 18:36

score 4 · Accepted Answer · answered Dec 06 '20 at 18:28

4

Either, modify the array and use .concat:

arr1 = arr1.concat(arr2)

arr1.push(...arr2)

answered Dec 06 '20 at 18:28

Aplet123

score 0 · Answer 2 · edited Dec 06 '20 at 19:25

0

You can do it with spread operator:

arr1 = [...arr1, ...arr2];

edited Dec 06 '20 at 19:25

Donald Duck

answered Dec 06 '20 at 18:32

Yoann Bdl

2 Answers2