Get function parameter names for interface purposes

Question

can anyone help me on how to retrieve function parameter names? For example:

var A = function(a, b, c) {};

I need to get the parameter name

Answer 1

The only way would be to retrieve the function as a string and use a RegExp to get the parameter names:

function test(a,b,c){/*function body*/}
//=> this should return 'a,b,c':
test.toString().replace(/(function.+\()(.+(?=\)))(.+$)/,'$2');