- Use the spread operator (...) to append partials to the list of arguments of fn.
//#Source https://bit.ly/2neWfJ2 const partialRight = (fn, ...partials) => (...args) => fn(...args, ...partials); const greet = (greeting, name) => greeting + ' ' + name + '!'; const greetJohn = partialRight(greet, 'John'); console.log(greetJohn('Hello'));
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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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