Example 1: Add Element to Array Using unshift()
// program to add element to an array
function addElement(arr) {
// adding new array element
arr.unshift(4);
console.log(arr);
}
const array = [1, 2, 3];
// calling the function
// passing array argument
addElement(array);
Output
[4, 1, 2, 3]
In the above program, the new element is added to the array variable using the unshift() method.
The unshift() method adds a new element at the beginning of an array.
Example 2: Add Element to Array Using splice()
// program to add element to an array
function addElement(arr) {
// adding element to array
arr.splice(0, 0, 4);
console.log(arr);
}
const array = [1, 2, 3];
// calling the function
addElement(array);
Output
[4, 1, 2, 3]
In the above program, the splice() method is used to add a new element to an array.
In the splice() method,
- The first argument is the index of an array where you want to add an element.
- The second argument is the number of elements that you want to remove from the index element.
- The third argument is the element that you want to add to the array.
Example 3: Add Element to Array Using Spread Operator
// program to add element to an array
function addElement(arr) {
// adding element to array
arr = [4, ...arr];
console.log(arr);
}
const array = [1, 2, 3];
// calling the function
addElement(arr);
Output
[4, 1, 2, 3]
In the above program, the spread operator ... is used to add a new element to the beginning of an array.
arr = [4, ...arr]; takes first element as 4 and the rest elements are taken from array.
Example 4: Add Element to Array Using concat()
// program to add element to an array
function addElement(arr) {
// adding element to array
arr = [4].concat(arr);
console.log(arr);
}
const array = [1, 2, 3];
// calling the function
addElement(array);
Output
[4, 1, 2, 3]
In the above program, the concat() method is used to add a new element to an array.
The concat() method combines two arrays into one.
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