> And everything because you want to write:
>
> map( filter( t, is_odd ), function( _, v ) print( v ) end )
>
> instead of:
>
> for i,v in ipairs( t ) do
> if is_odd( i ) then
> print( v )
> end
> end
It's maybe a little silly to use a map for side effects - for that you'd probably want to use a loop. Assuming you want to actually transform the values in some way, say to square them, your example might look like this:
local new_table = {}
for i, v in ipairs(t) do
if is_odd(i) then
table.insert(new_table, v * v)
end
end
Which I would write like this:
local odd_items = ifilter(is_odd, ipairs(t))
local new_table = imap(function(i, v) return v * v end, ipairs(odd_items))
Note that all functions are flexible in that:
* You can choose whether you iterate using pairs or ipairs (or a custom iterator)
* You can choose to return either a key-value table or an array (by choosing map or imap)
