This is destructuring (a new feature in ES6, the upcoming version of JavaScript). There's a great in-depth read on how it works here: http://www.2ality.com/2015

This is destructuring (a new feature in ES6, the upcoming version of JavaScript). There's a great in-depth read on how it works here: http://www.2ality.com/2015/01/es6-destructuring.html http://www.2ality.com/2015/01/es6-destructuring.html