Check if array has only one match

JavaScript, Array · Jul 4, 2021

Checks if an array has only one value matching the given function.

const hasOne = (arr, fn) => arr.filter(fn).length === 1;
hasOne([1, 2], x => x % 2); // true
hasOne([1, 3], x => x % 2); // false

Written by Angelos Chalaris

I'm Angelos Chalaris, a JavaScript software engineer, based in Athens, Greece. The best snippets from my coding adventures are published here to help others learn to code.

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