JavaScript Array concat()
Examples
Join two arrays:
const arr1 = ["Cecilie", "Lone"];
const arr2 = ["Emil", "Tobias", "Linus"];
const children = arr1.concat(arr2);
Join three arrays:
const arr1 = ["Cecilie", "Lone"];
const arr2 = ["Emil", "Tobias", "Linus"];
const arr3 = ["Robin"];
const children = arr1.concat(arr2, arr3);
Try it Yourself »
More examples below.
Definition and Usage
The concat() method concatenates (joins) two or more arrays.
The concat() method returns a new array, containing the joined arrays.
The concat() method does not change the existing arrays.
Syntax
array1.concat(array2, array3, ..., arrayX)
Parameters
| Parameter | Description |
| array1,... | Required. The array(s) to be concatenated. |
Return Value
| Type | Description |
| An array | The content from the joined arrays. |
More Examples
Concatenate strings and numbers:
const arr1 = ["Cecilie", "Lone"];
const arr2 = [1, 2, 3];
const arr3 = arr1.concat(arr2);
Concatenate nested arrays:
const arr1 = [1, 2, [3, 4]];
const arr2 = [[5, 6], 7, 8];
const arr3 = arr1.concat(arr2);
Try it Yourself »
Browser Support
concat() is an ECMAScript1 (ES1) feature.
ES1 (JavaScript 1997) is fully supported in all browsers:
| Chrome | IE | Edge | Firefox | Safari | Opera |
| Yes | Yes | Yes | Yes | Yes | Yes |
