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Check array only contains unique value javascript

You can check if an array contains only unique values in JavaScript by using a Set, which inherently only allows unique values.

Here’s how:

function isUnique(arr) {
    return new Set(arr).size === arr.length;
}

For example, calling isUnique([1, 2, 3, 4, 5]) will return true, but calling isUnique([1, 2, 3, 3, 5]) will return false.

javascript