Test if all array elements are truthy

OSCC · JavaScript, Array · Oct 18, 2020

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

  • Use Array.prototype.every() to test if all elements in the collection return true based on fn.
  • Omit the second argument, fn, to use Boolean as a default.
const all = (arr, fn = Boolean) => arr.every(fn);
all([4, 2, 3], x => x > 1); // true
all([1, 2, 3]); // true

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