Re: sunday afternoon whishlist: append/stream operator

[Petite Abeille <petite_abeille@...>]

On Jun 1, 2010, at 9:27 PM, Oliver Schmidt wrote:

> What do you think?

Why Sunday?

What about __add?

E.g.:

local function Add( aList, aValue )
    if type( aValue ) == 'table' then
        for anIndex = 1, #aValue do
            aList[ #aList + 1 ] = aValue[ anIndex ]
        end
    else
        aList[ #aList + 1 ] = aValue
    end
    
    return aList
end

local function Stream( aList )
    local aList = aList or {}
    
    setmetatable( aList, { __add = Add  } )
    
    return aList
end

local aList = Stream()

aList = aList + { 'a', 'b', 'c'} + 'f' + { 'x', 'y' } + 'z'

for anIndex = 1, #aList do
    print( anIndex, aList[ anIndex ] )
end

> 1	a
> 2	b
> 3	c
> 4	f
> 5	x
> 6	y
> 7	z