Re: Moving key & values from one table to another

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

On Mar 01, 2006, at 22:17, Chris wrote:

> Are there any tricks to insert all the keys and values of one table 
> into
> another?
>
> For example:
>
> t = {}
> t.a = "a"
> t.b = "b"
> t.c = "c"
>
> u = { unpack(t), d="d", e="e" }
>
> I know you can't use unpack except on numbered index values.   Is my 
> only
> choice a table.foreach with an insert of each value from `t' into `u'?

Ahhh... the lure of one liners... 8^)

local aMap = LUMap( { a = "a", b = "b", c = "c" } )
local aMapCopy = aMap:copy():putAll( { d = "d", e = "e" } )

print( "aMap", aMap )
print( "aMapCopy", aMapCopy )

> aMap     { a = a, c = c, b = b }
> aMapCopy { a = a, c = c, b = b, e = e, d = d }

And as others have pointed out, you will have to write your own code 
for this level of "convenience". Which is somewhat unfortunate as such 
operations are arguably quiet common.

Perhaps you might be interested by Reuben Thomas 'Standard Library 
Proposal':

http://lua-users.org/wiki/StandardLibraryProposal
http://lua-users.org/wiki/StandardLibraries

Cheers

--
PA, Onnay Equitursay
http://alt.textdrive.com/