JavaScript Program to Remove Duplicates From Array

Example 1: Using indexOf() and push()

Output

[1, 2, 3]

In the above program, the duplicate elements are removed from array.

Here,

• The for...of loop is used to loop through all the elements of an arr array.
• The indexOf() method returns -1 if the element is not in the array. Hence, during each iteration, if the element equals -1, the element is added to uniqueArr using push().

Example 2: Using Set

Output

[1, 2, 3]

In the above program, Set is used to remove duplicate items from an array.

A Set is a collection of unique values.

Here,

• The array is converted to Set and all the duplicate elements are automatically removed.
• The spread syntax ... is used to include all the elements of the Set to a new array.