Re: Iterators vs Lambdas
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- Subject: Re: Iterators vs Lambdas
- From: Philipp Janda <siffiejoe@...>
- Date: 2013年9月11日 15:59:18 +0200
Am 10.09.2013 19:37 schröbte Philipp Janda:
I prefer the first variant (iterators), but you can easily provide both:
Implement the iterator version and use something like this
[...]
to implement the callback version.
Here is the other way around:
do
local function co_body( args, f )
f( table.unpack( args, 1, args.n ) )
end
function make_it_func( f )
return function( ... )
local args = { n = select( '#', ... )+1, ... }
args[ args.n ] = coroutine.yield
return coroutine.wrap( co_body ), args, f
end
end
end
(Callback function assumed to be last parameter -- we need a temporary
table anyways).
Example:
local function foreach( t, f )
for k,v in pairs( t ) do f( k, v ) end
end
local mypairs = make_it_func( foreach )
for k,v in mypairs( { 1, 2, a = "a" } ) do
print( k, v )
end
==>
1 1
2 2
a a
Philipp