Remove duplicate values of the array in Javascript.

Learn how to remove the duplicate values in the array

Simple Way is using Set (which only contains unique value).

var array = [1,2,3,4,1,2,3];

var unique = [... new Set(array)] ;

//or 

var unique = Array.from (new Set(array) );

Another way is

var elements = [1,2,3,4,1,2,3];

var uniqueArray = elements.filter(function(element, currentIndex) {

      return elements.indexOf(element) == currentIndex;

});

The filter() method creates a new array with all elements that pass the test.

The indexOf() method returns the first index at which a given element can be found.

Consider we have an array elements = [1,2,3,1]

test case

element = 1, index = 0  

   elements.indexOf(1) == 0 // true

element = 2, index = 1

   elements.indexOf(2) == 1// true

element = 3, index = 2

    elements.indexOf(3) == 2// true

element = 1, index = 3

    elements.indexOf(1) == 3// false because the indexOf 1 is 0 so this test is failed , 1 is rejected 🙅‍♂️ .

You can read about set in details here.

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