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  2. Array Method Examples
  3. concat Examples

concat ExamplesΒΆ

The general syntax for this method is:

arrayName.concat(otherArray1, otherArray2, ...)

This method adds the elements of one array to the end of another. The new array must be stored in a variable or printed to the screen, because concat does NOT alter the original arrays.

Example

 1let arr = [1, 2, 3];
 2let otherArray = ['M', 'F', 'E'];
 3let newArray = [];
 4
 5newArray = arr.concat(otherArray);
 6console.log(newArray);
 7
 8newArray = otherArray.concat(arr);
 9console.log(newArray);
10
11console.log(arr.concat(otherArray, arr));
12
13console.log(arr);

Output

[1, 2, 3, 'M', 'F', 'E']
[ 'M', 'F', 'E', 1, 2, 3 ]
[ 1, 2, 3, 'M', 'F', 'E', 1, 2, 3 ]
[1, 2, 3]