Untechnically speaking: Arrow functions preserve the `this` in their declaration point, whereas regular functions change `this` if they're called as methods.
class Foo {
thisCouldBeAnything() {return this}
thisIsDefinitelyFoo = () => this
}
new Foo().thisCouldBeAnything.call('use me')
// 'use me'
new Foo().thisIsDefinitelyFoo.call('unused')
// Foo
Since the intention is often to keep `this` to refer to the class, people have been binding every single method in the class constructor, but this is no longer necessary thanks to arrow functions.
