RE: Mapping values from one table to another
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- Subject: RE: Mapping values from one table to another
- From: "Jerome Vuarand" <jerome.vuarand@...>
- Date: 2007年3月12日 20:15:30 -0400
Greg Bakker wrote:
> { 1, 2, 3 } => { {name="something1", value=1},
> {name="something2", value=2}, {name="something3", value=3} }
>
> Currently I'm using
>
> function map(f, v, ...)
> if v then
> return f(v), map(f, ...)
> end
> end
>
> function func(v) return {name="something"..v, value=v} end
>
> a = { 1, 2, 3 }
> b = { map(func, unpack(a)) }
>
> which is probable stack abuse. Is there a canonical approach; maybe a
> better way is to use a loop and insert-at-end?
You can use a simple loop:
function map(f, a)
local b = {}
for k,v in pairs(a) do
b[k] = f(v)
end
return unpack(b)
end