Question

Let’s say you have

var funct=function(a,b){
    return a+b;
};
console.log(funct);

Is there any way you can get the names of the arguments (a and b) from funct? If you are with in the function do you have any access to them? I know “arguments” gives you an array-like object, but is there anything that gives you a map-like or object-like representation of the arguments so that you can get their names when the function was declared?

Answer 1

One way is to turn the function into a string and parse it out

var funct=function(a,b){
    return a+b;
};
var re = /\(([^)]*)/;
var daArgs = funct.toString().match(re)[1].split(/,\s?/);
console.log(daArgs);

jsFiddle

Still have no clue why you would need it.