Spread (for arrays) was added with ES6. This just adds that kind of thing for objects (ES2017). let a = [1, 2, 3]; Math.max(...a); // 3 If you use that op

Spread (for arrays) was added with ES6. This just adds that kind of thing for objects (ES2017). let a = [1, 2, 3]; Math.max(...a); // 3 If you use that operator in parameters, it's rest (i.e. variadic stuff). function sum(...numbers) { return numbers.reduce((a, b) => a + b, 0); } sum(1, 2, 3, 4, 5); // 15