JavaScript Program To Insert Item In An Array - Programiz

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JavaScript Program to Insert Item in an Array

To understand this example, you should have the knowledge of the following JavaScript programming topics:

  • JavaScript Array splice()
  • JavaScript for loop
  • JavaScript Array

Example 1: Add Item to Array Using splice()

// program to insert an item at a specific index into an array function insertElement() { let array = [1, 2, 3, 4, 5]; // index to add to let index = 3; // element that you want to add let element = 8; array.splice(index, 0, element); console.log(array); } insertElement();

Output

[1, 2, 3, 8, 4, 5]

In the above program, the splice() method is used to insert an item with a specific index into an array.

The splice() method adds and/or removes an item.

In the splice() method,

  • The first argument specifies the index where you want to insert an item.
  • The second argument (here 0) specifies the number of items to remove.
  • The third argument specifies the element that you want to add to an array.

Example 2: Add Item to Array Using for Loop

// program to insert an item at a specific index into an array function insertElement() { let array = [1, 2, 3, 4]; // index to add to let index = 3; // element that you want to add let element = 8; for (let i = array.length; i > index; i--) { //shift the elements that are greater than index array[i] = array[i-1]; } // insert element at given index array[index] = element; console.log(array); } insertElement();

Output

[1, 2, 3, 8, 4]

In the above program,

  • The for loop is used to iterate through the array elements.
  • The element is added to the given index.
  • All the elements whose index is greater than the given index are shifted one step to the right.

Also Read:

  • JavaScript Program to Add Element to Start of an Array
  • JavaScript Program to Append an Object to An Array

Tag » Add Element Array Js