Check if array has many matches

JavaScript, Array · Jul 11, 2021

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

Use Array.prototype.filter() in combination with fn to find all matching array elements.
Use Array.prototype.length to check if more than one element match fn.

const hasMany = (arr, fn) => arr.filter(fn).length > 1;

hasMany([1, 3], x => x % 2); // true
hasMany([1, 2], x => x % 2); // false

Written by Angelos Chalaris

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