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How do I make an array with unique elements (remove duplicates) - JavaScript?
Let’s say the following is our array with duplicate elements −
var duplicateNumbers = [10, 20, 100, 40, 20, 10, 100, 1000];
We want the output to be −
[10, 20, 100, 40, 1000];
To display only the unique elements, use the concept of filter.
Example
Following is the code −
var duplicateNumbers = [10, 20, 100, 40, 20, 10, 100, 1000];
console.log("With Duplicates Values=");
console.log(duplicateNumbers);
var noDuplicateNumbersArray = duplicateNumbers.filter(function (value, index, array) {
return array.indexOf(value) === index;
}
);
console.log("Without Duplicates Values=")
console.log(noDuplicateNumbersArray);To run the above program, you need to use the following command −
node fileName.js.
Here, my file name is demo234.js.
Output
The output is as follows −
PS C:\Users\Amit\JavaScript-code> node demo234.js With Duplicates Values= [ 10, 20, 100, 40, 20, 10, 100, 1000 ] Without Duplicates Values= [ 10, 20, 100, 40, 1000 ]
Updated on 03-Oct-2020 15:07:15
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