JavaScript removes duplicate elements from an array

This example shows how JavaScript removes duplicate elements from an array. Share with you for your reference. The specific analysis is as follows:

This JS code is used to remove duplicate elements from the array, such as: ['apple', 'orange', 'peach', 'apple', 'strawberry', 'orange'] deduplication and return: s ['apple', 'orange', 'peach', 'strawberry']

function removeDuplicates(arr) {

    var temp = {};

    for (var i = 0; i < arr.length; i++)

        temp[arr[i]] = true;

    var r = [];

    for (var k in temp)

        r.push(k);

    return r;

}

//Usage

var fruits = ['apple', 'orange', 'peach', 'apple', 'strawberry', 'orange'];

var uniquefruits = removeDuplicates(fruits);

//print uniquefruits ['apple', 'orange', 'peach', 'strawberry'];

The following code can be verified in the browser

Remove duplicate elements from an array.  <br>

<pre>     var fruits = ['apple', 'orange', 'peach', 'apple', 'strawberry', 'orange'];

</pre>

Note 'orange' is duplicate in fruits array. Click to remove duplicate elements from fruits array:<br>

<button onclick="check()">Remove Duplicate</button>

<script>

function removeDuplicates(arr) {

    var temp = {};

    for (var i = 0; i < arr.length; i++)

        temp[arr[i]] = true;

    var r = [];

    for (var k in temp)

        r.push(k);

    return r;

}

function check() {

    var fruits = ['apple', 'orange', 'peach', 'apple', 'strawberry', 'orange'];

    var uniquefruits = removeDuplicates(fruits);

    alert(uniquefruits);

}

</script>

I hope this article is helpful for you to design javascript program.