RE: Mapping values from one table to another

["Jerome Vuarand" <jerome.vuarand@...>]

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