hasDuplicates javascript Code Snippet in 2024
arraybeginner
Last Updated: 22 July 2024
Checks if there are duplicate values in a flat array.
- Use
Set()to get the unique values in the array. - Use
Set.prototype.sizeandArray.prototype.lengthto check if the count of the unique values is the same as elements in the original array.
const hasDuplicates = arr => new Set(arr).size !== arr.length;
hasDuplicates([0, 1, 1, 2]); // true hasDuplicates([0, 1, 2, 3]); // false
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