Re: lists with nil play nice for Lua 5.2

[PA <petite.abeille@...>]

On Aug 01, 2007, at 13:30, Roberto Ierusalimschy wrote:

>   a = new.tuple(2, nil, "foo")
>   #a   -- not available; perhaps a"#" ???
>   a:insert("baz")   -- not available (tuples are immutable)
>   a(3)    -- yields "foo"
>   a()     -- yields 2, nil, "foo"
>   for i, v in a do ...    -- or something like this...

Another wacky implementation with support for 'unpack' of sort:

local Tuple = require( 'Tuple' )
local aTuple = Tuple( 2, nil, 'foo', nil )

print( #aTuple ) -- count
print( aTuple( 3 ) ) -- one value
print( aTuple( '*' ) ) -- all values

for anIndex, aValue in aTuple do -- enumerate
    print( anIndex, aValue )
end

> 4
> foo
> 2       nil     foo     nil
> 1       2
> 2       nil
> 3       foo

Attachment: Tuple.lua
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