Inspect the names/values of arguments in the definition/execution of a JavaScript function

Question

I\'m looking to do the equivalent of Python\'s inspect.getargspec() in Javascript.

I do know that you can get the arguments list from a Jav

Answer 1

Sightly improved version of Jonathan Fingland's answer:

// Utility function to extract arg name-value pairs
function getArgs(args) {
    var argsObj = {};

    var argList = /\(([^)]*)/.exec(args.callee)[1];
    var argCnt = 0;
    var tokens;

    while (tokens = /\s*([^,]+)/g.exec(argList)) {
        argsObj[tokens[1]] = args[argCnt++];
    }

    return argsObj;
}

// Test subject
function add(number1, number2) {
    var args = getArgs(arguments);
    alert(args.toSource()); // ({number1:3,number2:4})
}

// Invoke test subject
add(3, 4);

Note: This only works on browsers that support arguments.callee.

(Also posted at How to get function parameter names/values dynamically from javascript)