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Home / Miscellaneous / Check if all array elements are unique

Check if all array elements are unique

Check if all array elements are unique

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;

// EXAMPLES
allUnique([1, 2, 3, 4]); // true
allUnique([1, 1, 2, 3]); // false

Source

https://www.30secondsofcode.org/js/s/all-unique

Miscellaneous

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  • Perform a shallow merge of two or more objects
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  • Combine all items in an array into a string

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