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LFW211 JSNAD CH-9 LABS-1

Posts: 2
in LFW211 Class Forum

So, I have the solution of

  1. ee.once('tick', listener)

But can anyone explain why the following options do not work?

  1. ee.once('tick', listener())
  2.  

OR

  1. ee.once('tick', 
  2.   () => {
  3.     listener()
  4.   }
  5. )

Seems like most of the time I waste is dancing around silly syntax errors like this and I wish I understood when I'm permitted to pass an empty constructor to a function.

Comments

  • Posts: 160

    @samuelbernardy yes knowledge of syntax certainly helps, but it gets more familiar and therefore easier over time

    the format is:
    ee.once(name, listenerFunction)

    So your first one works because you're passing a function, the second one doesn't work because you're passing whatever listener returns (you're calling the function) which I expect in this case is undefined and so you'd see an error like "undefined is not a function"

    And the last case, must be a false negative for you because that will also work, you're passing a function which is called once tick event is emitted, and that function in turns calls the listener function.

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