extract function arguments

function-arguments.js

var parameterCommentsPattern = /((\/\/.*$)|(\/\*[\s\S]*?\*\/)|\s+)/mg;
function getParameters(func) {
  var text = Function.prototype.toString.call(func)
    .replace(parameterCommentsPattern, '');
  
  if (text === 'function(){[nativecode]}') {
    throw new Error('Cannot extrapolate parameters from bound and native functions');
  }
  
  var params = text
    .slice(text.indexOf('(') + 1, text.indexOf(')'))
    .split(',')
    .filter(Boolean);

  if (params.length !== func.length) {
    throw new Error('Failed to extrapolate parameters properly');
  }
  
  return params;
}
var someFunc = function(a,b,/*c*/d){};
console.log(getParameters(someFunc));