On 2/13/2018 10:16 PM, Otared Kavian wrote:
On 13 Feb 2018, at 17:38, Hans Hagen <pra...@wxs.nl> wrote:

[…]

context.goto( "Index", { "ref:index" })

\def\foo#1#2{....}

context.foo("a","b")

\def\foo[#1][#2]{....}

context.foo( { "a" }, { "b" } )

etc

Hi Hans,

Thanks for your attention, your quick response and the hints, especially 
regarding the definition of a command with brackets.

Indeed, as you may see with the following modified example,
        context.goto("Index",{"ref:index"})
generates an error, maybe because of a delimiter issue with the definition of 
\goto.
However, after defining a \MyGoTo command with delimiters being explicitely 
brackets, then
        context.MyGoTo({"Index"},{"ref:index"})
works fine, as well as
        local s,t = "Index","ref:index"
        context.MyGoTo({s},{t})
so that my problem is solved…

Best regards: OK
%% begin test-lua-reference.tex
\setupinteraction[state=start]
\def\MyGoTo[#1][#2]{\goto{#1}[#2]}
\starttext

\startchapter[title={Ward},reference={ch:ward}]

\startluacode
        context.index("Knuth")
        context.index("Ward")
        context("Read Knuth and see also the ")
        local s,t = "Index","ref:index"
        context.MyGoTo({s},{t})
--      context.goto("Index",{"ref:index"}) -- this does not work
\stopluacode

you need to use

context["goto"]("Index",{"ref:index"}) -- this does not work

because "goto" is a reserved lua word

you can't say foo.if or foo.end either

\input ward.tex

\stopchapter

\starttitle[title={Index}]
\startluacode
        local s,t = "ref:","index"
        context.pagereference({"ref:index"})
\stopluacode
\placeindex
\stoptitle

\stoptext
%% end test-lua-reference.tex
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