Test if all array elements are falsy

OSCC · JavaScript, Array · Oct 21, 2020

Checks if the provided predicate function returns false for all elements in a collection.

  • Use Array.prototype.some() to test if any elements in the collection return true based on fn.
  • Omit the second argument, fn, to use Boolean as a default.
const none = (arr, fn = Boolean) => !arr.some(fn);
none([0, 1, 3, 0], x => x == 2); // true
none([0, 0, 0]); // true

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