There are methods to add elements to the array using push method and concat method.

The array push method adds element at the end of an array and returns its new length.



Syntax :- array.push(item1, item2, ..., itemX)

Below is the example code :

var arr = [
    one,
    two,
    Three
];

// append new value to the array
arr.push(four);

// append multiple values to the array
arr.push(five, six);

// display all values
for (var i = 0; i < arr.length; i++) {
    console.log(arr[i]);
}

The array concat method also adds an element at the end of an array but it returns a new array unlike push method that returns the modified array.

Syntax:-array1.concat(array2, array3,..., arrayX)

Below is the example code:

var ar1 = [1, 2, 3];
var ar2 = [4, 5, 6];

var ar3 = ar1.concat(ar2);

console.log(ar1);
console.log(ar2);
console.log(ar3);