Hi Mathieu, On 2012-01-27 19:06, Mathieu Dupont wrote: > > Hi List, > Running the following code, variable "a" should not be modified > by my function, and stay (1,2), but it does get modified and > becomes (4,2) like the new variable "b" I am creating.
Tables are references. Using the “local” keyword, you generate a
local variable that still points to the original table. Instead,
you need to (deep) copy the table explicitly.
·································································
\starttext
\startluacode
function myFunc(arg)
local var = table.copy(arg)
var[1] = var[1] + 3
return var
end
local a = {1,2}
local b = myFunc(a)
context.type(table.serialize(a)) context[[\par\blank]]
context.type(table.serialize(b)) context[[\par\blank]]
\stopluacode
\stoptext \endinput
·································································
There’s also a function table.fastcopy(), see
<http://wiki.contextgarden.net/table_manipulation#table.fastcopy.28table_t.2C_.5Bboolean_meta.5D.29>
Hth, Philipp
> What is wrong with my code ?
> Thank you for any hint !
> Mathieu
>
> \starttext
>
> \startluacode
>
> function myFunc(arg)
> local var = arg
> var[1] = var[1] + 3
> return var
> end
>
> local a = {1,2}
>
> context("a = \\{")
> context(a[1])
> context(",\\;")
> context(a[2])
> context("\\}\\par")
> context("\\blank")
>
> local b = myFunc(a)
>
> context("a = \\{")
> context(a[1])
> context(",\\;")
> context(a[2])
> context("\\}\\par")
> context("\\blank")
>
> context("b = \\{")
> context(b[1])
> context(",\\;")
> context(b[2])
> context("\\}\\par")
>
> \stopluacode
>
> \stoptext
>
>
>
>
>
>
>
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>
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___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________
