These are not new ES6 features. I think you can get a really good explanation from the you don't know js serie. https://github.com/getify/You-Dont-Know-JS/blob

These are not new ES6 features. I think you can get a really good explanation from the you don't know js serie. https://github.com/getify/You-Dont-Know-JS/blob/master/this%20%26%20object%20prototypes/ch3.md https://github.com/getify/You-Dont-Know-JS/blob/master/this%... The whole serie of book is worth it and free to read on github