Cofounded Host Collective (DiscountASP.net). Cofounded Player Axis (Social Gaming). Computer Scientist and Technology Evangelist with 20+ years of experience with JavaScript!
What is the purpose of trying to access this.event on the 5th line? If this.event was a value declared in the parent scope, the fat arrow would actually save you. The implication of using EventEmitter2 would be so that you can access arguments from the callback of the events.on method (ie. args passed inside the callback).
Cofounded Host Collective (DiscountASP.net). Cofounded Player Axis (Social Gaming). Computer Scientist and Technology Evangelist with 20+ years of experience with JavaScript!
So you can use the arrow function to get access to the parent context and still access the element you have attached the listener to... Please don't stop using this just because you don't know how a lib works.
Arrow functions solve ONE of the problems with
this
.Here's a reference to
this
that you can't arrow function your way out of.nothis
also does more than removethis
. It lets you use arrow functions and also argument destructuring. Both of which are not options otherwise.What is the purpose of trying to access
this.event
on the 5th line? Ifthis.event
was a value declared in the parent scope, the fat arrow would actually save you. The implication of usingEventEmitter2
would be so that you can access arguments from the callback of theevents.on
method (ie. args passed inside the callback).The code is correct. This is how their API is written. I need the
this
from thefunction
inside theevents.on
method, not the parent scope.It works the same way jQuery's
this
context works here:You can't write an arrow function for these.
Actually,
jQuery
calls the callback of theelement
'sthis
passed into it viaapply
andcall
. Check it out: code.jquery.com/jquery-3.3.1.jsIn jquerys events
this
is the same asevent.delegateTarget
: api.jquery.com/event.delegateTarget/So you can use the arrow function to get access to the parent context and still access the element you have attached the listener to... Please don't stop using
this
just because you don't know how a lib works.