MOCKSTACKS
EN
Questions And Answers

More Tutorials




Remove duplicates from an array in Javascript


The filter() method creates a new array of elements that pass the condition we provide. It will include only those elements for which true is returned. We can remove duplicate values from the array by simply adjusting our condition.

<script>
	var arr = ["apple", "mango", "apple",
			"orange", "mango", "mango"];

	function removeDuplicates(arr) {
		return arr.filter((item,
			index) => arr.indexOf(item) === index);
	}

	console.log(removeDuplicates(arr));
</script>

Output

["apple", "mango", "orange"]

This method sets a new object type with ES6 (ES2015) that allows you to create collections of unique values.

<script>
	var arr = ["apple", "mango", "apple",
			"orange", "mango", "mango"];

	function removeDuplicates(arr) {
		return [...new Set(arr)];
	}

	console.log(removeDuplicates(arr));
</script>

Output

["apple", "mango", "orange"]


Conclusion

In this page (written and validated by ) you learned about . What's Next? If you are interested in completing Javascript tutorial, we encourage you simply to start here: Javascript Tutorial.



Incorrect info or code snippet? We take very seriously the accuracy of the information provided on our website. We also make sure to test all snippets and examples provided for each section. If you find any incorrect information, please send us an email about the issue: mockstacks@gmail.com.


Share On:


Mockstacks was launched to help beginners learn programming languages; the site is optimized with no Ads as, Ads might slow down the performance. We also don't track any personal information; we also don't collect any kind of data unless the user provided us a corrected information. Almost all examples have been tested. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. By using Mockstacks.com, you agree to have read and accepted our terms of use, cookies and privacy policy.