There are three ways to add elements to a JavaScript array.

There are three ways to add elements to a JavaScript array.

1. With the push() method, you can add one or more elements to the end of an array and it will return the new length of the array. For example:

var arr = [1, 2, 3];
arr.push(4); // [1, 2, 3, 4]

1. By using the unshift() method, you can add one or more elements to the beginning of an array and it will return the new length of the array. For example:

var arr = [2, 3, 4];
arr.unshift(1); // [1, 2, 3, 4]

1. The concat() method is used to merge two or more arrays and return a new array. You can use the concat() method to merge the elements to be added into a new array, and then replace the original array with the new array. For example:

var arr = [1, 2];
var newArr = arr.concat(3); // [1, 2, 3]