While in ES5 ‘this’ referred to the parent of the function, in ES6, arrow functions use lexical scoping — ‘this’ refers to it’s current surrounding scope and no further. Thus the inner, and not to the object’s method or the object itself.
Sam Solomon
David Doe
The cycle for adding new features, including any refactoring, is roughly this: write failing test; code; get to green; make it right. If you’re doing it right, you’re executing a lot of unit tests along the way, sometimes a focused set and sometimes the entire suite.
