allUnique javascript Code Snippet in 2025
arraybeginner
Last Updated: 19 January 2025
Checks if all elements in an array are unique.
- Create a new
Setfrom the mapped values to keep only unique occurrences. - Use
Array.prototype.lengthandSet.prototype.sizeto 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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