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allUnique javascript Code Snippet in 2022

arraybeginner

Last Updated: 26 November 2022

Checks if all elements in an array are unique.

  • Create a new Set from the mapped values to keep only unique occurrences.
  • Use Array.prototype.length and Set.prototype.size to compare the length of the unique values to the original array.
const allUnique = arr => arr.length === new Set(arr).size;
allUnique([1, 2, 3, 4]); // true allUnique([1, 1, 2, 3]); // false

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