Discussion on: Which Array Function When?

Nice article! Everyone seems to forget my two favorite functions though, some and every

If you've ever written something like

const items= [1, 9, 4, 2, 42];

// checks if any item in the array matches the predicate
var hasAnyBigItems = items.some(item => item > 10));

// checks if every item in the array matches the predicate
var allPositive = items.every(item => item > 0);

If you ever find yourself checking the length property after items.filter(), you can likely use some or every to do the same thing without the array generation penalty.