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[JS] Answer the second part of "this" question (#200) 

* Adds the second part of this question originally stated in the h5bp version.

* Correct grammar
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Rob Levin 2019-06-02 10:50:07 -07:00 committed by Yangshun Tay
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@ -84,6 +84,10 @@ There's no simple explanation for `this`; it is one of the most confusing concep
For an in-depth explanation, do check out his [article on Medium](https://codeburst.io/the-simple-rules-to-this-in-javascript-35d97f31bde3).
#### Can you give an example of one of the ways that working with this has changed in ES6?
ES6 allows you to use [arrow functions](http://2ality.com/2017/12/alternate-this.html#arrow-functions) which uses the [enclosing lexical scope](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions#No_separate_this). This is usually convenient, but does prevent the caller from controlling context via `.call` or `.apply`—the consequences being that a library such as `jQuery` will not properly bind `this` in your event handler functions. Thus, it's important to keep this in mind when refactoring large legacy applications.
###### References
* https://codeburst.io/the-simple-rules-to-this-in-javascript-35d97f31bde3