add values to array using for loop in javascript code example

Example 1: putting a loop into an array javascript

function test() {
    var sub_array = [];
    var super_array = [];
    for (var i = 1; i <= 3; i++) {
        sub_array.push(i);
        super_array.push(sub_array.slice(0));
    }
    alert(super_array);
}

Example 2: how to insert data in array via for loop js

function add(new_element){
	let arr = [1,2,3,4,5];
	for(let i=0;i<arr.length;i++)
	{
		arr.push(new_element);
	}

	return arr;
}

console.log(add("a"));