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Kristian Woods
23,414 Pointscan you use the es6 arrow syntax and use the bind() method to force the context of "this"?
can you use the es6 arrow syntax and use the bind() method to force the context of "this"?
Steven Parker
231,275 PointsThat's not good practice, and it works only because the object name happens to be "book".
But "this" will work no matter what name is given to the object.
2 Answers
Steven Parker
231,275 PointsIf you want to use "bind", "apply" or "call", then you need a conventional function. Arrow functions don't define "this", so you don't have an opportunity to supply a new one.
For more details, see the MDN page on Arrow Functions.
Chris Shaw
26,676 PointsArrow functions don't define "this", so you don't have an opportunity to supply a new one.
Just to clarify, arrow functions bind context using a concept known as lexical this. Technically, arrow functions do define this from the parent context but it is done implicitly compared to bind, apply and call which are explicit.
Steven Parker
231,275 PointsThe MDN explanation is that the enclosing scope is used because the arrow function does not have it's own "this". But otherwise, we're saying the same thing. The important factor is that their behavior is significantly different from conventional functions in this regard.
kat bal
590 Points" Steven Parker
That's not good practice, and it works only because the object name happens to be "book".
But "this" will work no matter what name is given to the object."
@Steven: Thanks for the explanation!
kat bal
590 Pointskat bal
590 PointsQuestion: on the tutorial, the tutor put (this.title) but when i put (book.title) it works as well. Any explanation on that?
// new instance book: //
const book = new Vue ({ el: '#book', data: { title: "The Sirens of Titan", message: "Kurt Vonnegut", name: "This is a summary of the Sirens of Titan!!" }, methods: { sayHello: function(){ alert(book.title); } } });