JavaScript Program to Remove Duplicate Array Elements

    RahulBy 1 Min ReadUpdated:

    An array is a data structure that contains a group of elements. Typically these elements are all of the same data type, such as an integer or string but in the case of JavaScript, we can store different types of elements. Using arrays you can organize data so that a related set of values can be easily sorted or searched.

    This tutorial described to you to remove duplicate array elements using JavaScript.

    Example

    Here is a sample JavaScript program to declare a static array with few default elements. Add some duplicate elements as well. After that, remove all the duplicate array elements.

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    // An example JavaScript program to remove duplicate values from an array
     
    function returnUnique(value, index, self) {
      return self.indexOf(value) === index;
    }
     
    // usage example:
    var arr = ['Green', 'Red', 100, 'Green', 20, '100'];
    var unique = arr.filter(returnUnique);
     
    console.log(unique); //

    Output:

    ["Green", "Red", 100, 20, "100"]

    In the above example, the value “Green” was defined twice in the array. As a result, you see only one instance of Green.

    You may be thinking about element 100. Here the first occurrence of the element 100 is an integer value and the second one is defined as a string. In short, both elements are treated as unique.

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