Re: orif
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- Subject: Re: orif
- From: Sean Conner <sean@...>
- Date: 2015年8月14日 20:05:17 -0400
It was thus said that the Great Sean Conner once stated:
> It was thus said that the Great Soni L. once stated:
> > (Copypasted from
> > https://gist.github.com/SoniEx2/99882fa8d5a0740339b0#the-orif-idea )
> >
> > The orif Idea
> > =============
> >
> > orif (possible operators: `|if`, `orif`, `or if`, ...) is a construct that
> > allows if statements with **explicit** fall-through.
>
> It's an interesting idea, but I'm still unsure if I like the name "orif"
> or not. I don't really like it, but I can't come up with a better name.
>
> But, if it's a switch with a fallthrough case you are missing (and
> frankly, I really haven't missed it that much in Lua), what about the
> following?
>
> -- ----------------------------
> -- You need this function
> -- ----------------------------
>
> function switch(key,case,otherwise)
> otherwise = otherwise or function() return nil end
>
> if not case[key] then
> return otherwise(case,key)
> else
> return case[key](case,key)
> end
> end
Here's a better (smaller, faster) function that does the same thing:
-- --------------------------------------------------
-- License: GPL, LGPL, MIT, BSD. Pick your poison.
-- --------------------------------------------------
function switch(key,case,otherwise)
return (key[case] or otherwise or function() return nil end)(case,key)
end
-spc