30-seconds-of-code/snippets/all.md

title, tags, expertise, cover, firstSeen, lastUpdated

title	tags	expertise	cover	firstSeen	lastUpdated
Test if all array elements are truthy	array	beginner	blog_images/touch-flower.jpg	2018-02-14T11:46:15+02:00	2020-10-18T20:24:28+03:00

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