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- Subject: Re: [Proposal] Lua-y lambda syntax
- From: "Soni L." <fakedme@...>
- Date: Thu, 27 Apr 2017 14:59:41 -0300
On 2017-04-27 02:33 PM, Egor Skriptunoff wrote:
On Thu, Apr 27, 2017 at 5:43 PM, Soni L. <firstname.lastname@example.org
So, out of all syntax proposals for lambas, I'm surpised nobody
thought of this beauty.
You see, we have `local x = function(a,b,c) return thing end`
1. It's a syntax error to use `function(a,b,c) =thing end`, even
if the REPL accepts `=` as an alias for `return`.
2. Do we need `end` if we restrict it to a single expression?
Combine these 2, and the simplest solution seems to be:
local x = function(a,b,c) = thing
AND we can still get multiple returns:
local x = function(a,b,c) = select(1,a,b,c)
print(x(1, 2, 3)) --> 1, 2, 3
The idea is, function(a,b,c) starts a plain old function. If the
next token is a =, this has to be a lambda. Otherwise it has to be
There's no ambiguity here since the proposed syntax is currently a
syntax error. It also looks very much like Lua.
The following looks nice:
local swap = function(a,b) = b,a
local swap = (function(a,b) = b), a
You need to use select() if you want multiple return values. It's a
But what does the following nested lambda
local x = function(a,b) = function() = a, b
local x = function(a,b) = (function() = a, b)
local x = function(a,b) = (function() = a), b
(OT: Sorry for accidentally replying wrong. Some thunderbird update
changed the behaviour of the "reply" button so instead of defaulting to
reply-to-list I need to actually click the reply-to-list button, which
I'm not used to doing.)
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