frankiehayward
10/9/2019 - 2:34 PM

all

This snippet returns true if the predicate function returns true for all elements in a collection and false otherwise. You can omit the second argument fn if you want to use Boolean as a default value.

all.js
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const all = (arr, fn = Boolean) => arr.every(fn);

all([4, 2, 3], x => x > 1); // true
all([1, 2, 3]); // true