json - How do I define a javascript function as a variable from a variable -

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i'm trying create callback function in response jsonp request in node.

i receive callbackname string, , have object (lets var obj = {a : "b"}) need return following :

callbackname({a : "b"});

i tried concatenating strings - got 

"callbackname([object object])";

i tried json.stringify got:

"callbackname({\"a\":\"b"});"

which close - it's stringy. there way want?

update

the code i'm using - in aws lambda function (turns out rather significant!)

    context.succeed(request.callback + "(" + json.stringify(obj) + ");");

as mentioned below - lambda expects object in succeed, calls json.stringify on.

any ideas on how proceed?

if understand question, need this:

var obj = {a:"b"}; var callbackname = "callback";  var scope = {};  scope.callback = function(e) {     return function() {         console.log(e);     } }  settimeout( scope[callbackname](obj), 1000 );

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