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From: Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups: comp.lang.javascript
Subject: Re: An "if" without "if"
Date: Sun, 03 Jul 2016 11:07:51 +0100
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ram@zedat.fu-berlin.de (Stefan Ram) writes:

> Scott Sauyet <scott@sauyet.com> writes:
>>Stefan Weiss wrote:
>>>I have some doubts about the wisdom of introducing arrow functions and
>>>default arguments to a class before covering basics like if-else
>>>branching, but there may be a valid reason for this. 
>>Another very interesting work which proceeds the same way is Reg 
>>Braithwaite's _JavaScript Allongé_, either the original edition [1] or 
>>the ES6 one [2].
>
>   In the meantime, my course has finished, and I have learned
>   that for the goal of my beginner's course, which is to learn
>   event handling with JavaScript, I do not need neither
>   parameters nor default values nor the keyword »function«,
>   so, in the next course, I'll just explain parameterless
>   arrows only. For example, I'll explain
>
> ()=> 1
>
>   and slightly later I'll explain blocks, like, for example, in
>
> f = ()=> { console.log( "a" ); return 3; }
>
>   . Then, near the end of the short (18 hours) course,
>   I can show code like the following:
>
> onClick = () => span.classList.toggle( "off" );
>
> span = window.document.getElementById( "number" );
>
> window.document.getElementById( "brackets" ).
> addEventListener( "click", onClick );

Avoiding parameters seems like an odd choice:

  window.document.getElementById( "brackets" ).
  addEventListener( "click",
      (span => {return () => span.classList.toggle( "off" );})(
          window.document.getElementById( "number" ))
  );

-- 
Ben.