[erlang-questions] if-elseif-else trick

Donald Steven t6sn7gt@REDACTED
Wed Feb 20 14:16:41 CET 2019

I don't think:


yielding ?else ->

is much of an improvement.

Why not just allow the keyword else as a synonym for true when its usage 
would improve the readability? (At times, "true" reminds me of trying to 
read (SAT-like) sentences like: "Whenever he couldn't think of whether 
or not he might have forgotten to turn the light on or off, or not.")

On 2/19/2019 6.23 AM, Mikael Pettersson wrote:
> On Tue, Feb 19, 2019 at 8:37 AM Viktor Söderqvist <viktor@REDACTED> wrote:
>> The point of the ?elseif syntax trick is that it lets you write the
>> nested case above as the flat structure:
>> f() ->
>>      ?'if'(g1())   -> a;
>>      ?elseif(g2()) -> b;
>>      ?elseif(g3()) -> c;
>>      ?else         -> d.
> So you've reimplemented LISP's COND.  Please just do it properly in
> the Erlang parser (I belive 'cond' is already a reserved word), and
> write an EEP for it.
> FWIW, my code tends to be CASE heavy largely to avoid the inherent
> problems of Erlang's limited guard expressions and butt-ugly "if".
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