javascript concat instead of add code example

Example 1: javascript push and concat

//push() adds element in the end of array
// concat() also the same, but if the element is array, that element will probably separate elements of itself in the end of the array

Example 2: how the concat function works javascript

var arr = [1, 2, 3, 4];
var arr2 = [5, 6, 7, 8];

const both = arr.concat(arr2);

console.log(both);
//[1, 2, 3, 4, 5, 6, 7, 8]