hasMany

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