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hasDuplicates javascript Code Snippet in 2024

arraybeginner

Last Updated: 20 April 2024

Checks if there are duplicate values in a flat array.

  • Use Set() to get the unique values in the array.
  • Use Set.prototype.size and Array.prototype.length to 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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