Re: Ternary operator patch
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- Subject: Re: Ternary operator patch
- From: Sean Conner <sean@...>
- Date: Sun, 9 Jun 2019 14:27:15 -0400
It was thus said that the Great steve donovan once stated:
> On Sun, Jun 9, 2019 at 5:23 AM JKB <bcs@hush.ai> wrote:
> > a = if b == 1 then x else y
>
> Anybody else really feeling the need for 'end' at the end?
>
> Is there any serious syntax/semantic reason why the if 'statement'
> cannot be an expression?
It feels weird to me.
What does the block return?
a = if b == 1 then
local x = foo()
x -- wold have to be valid I guess
else
local x = bar()
x + 5 -- this would be valid too I suppose
end
What about nested statements?
a,n = if b == 1 then
if c == 2 then
5
else
6
end
else
if c == 2 then
3,blimy()
else
wtf() -- does this return one or two values?
end
end
And a function rewritten with the proposed 'if as expr' syntax:
function request(location)
return if location.host == 'localhost' then
if location.selector == 'bookmarks' then
(require "CONF".bookmarks),0
elseif location.selector == 'history' then
'/tmp/gopher.log',0
else
nil,'error'
end
end
Eh ...
-spc