- Call the provided function, fn, with up to n arguments, using Array.prototype.slice(0, n) and the spread operator (...).
//#Source https://bit.ly/2neWfJ2 const ary = (fn, n) => (...args) => fn(...args.slice(0, n)); const firstTwoMax = ary(Math.max, 2); console.log([[2, 6, 'a'], [8, 4, 6], ].map(x => firstTwoMax(...x)));
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ECMAScript 6 introduced String.prototype.includes:
const string = "foo"; const substring = "oo"; console.log(string.includes(substring));
includes doesn't have Internet Explorer support, though. In ECMAScript 5 or older environments, use String.prototype.indexOf, which returns -1 when a substring cannot be found:
var string = "foo"; var substring = "oo"; console.log(string.indexOf(substring) !== -1);
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