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

The following function will return an array of parameter names of any function passed in.

function getParamNames(func) {
    var funStr = func.toString();
    return funStr.slice(funStr.indexOf('(')+1, funStr.indexOf(')')).match(/([^\s,]+)/g);
}

Example usage:

getParamNames(getParamNames) // returns ['func']
getParamNames(function (a,b,c,d){}) // returns ['a','b','c','d']