What’s the easiest most memorable way to find duplicates in a JavaScript array?

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What’s the easiest most memorable way to find duplicates in a JavaScript array?

@cassie3 → + 1,000Aug 11.2022

If I have a JavaScript array such as:

var example = ["a", "b", "b", "c", "d"];

How do I check if there’s a duplicare string in this array?

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JavaScript

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score 0 · Accepted Answer

If ES6 can be used:
Because a Set's values have to be unique, you could put the array in a Set object and compare the size of the Set against the array's length:


 function checkIfDuplicateExists(arr) {
 return new Set(arr).size !== arr.length
 }
 
 var example = ["a", "b", "b", "c"];
 var example2 = ["a", "b", "c"];
 
 console.log(checkIfDuplicateExists(example)); // true
 console.log(checkIfDuplicateExists(example2)); // false

What’s the easiest most memorable way to find duplicates in a JavaScript array?

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