Test path in object

readme.md

Instead of this:

if( person !== undefined && person.details !== undefined && person.details.city !== undefined )

Using this method you can use this:

if( person.testPath('details.city') )

testpath.js

Object.prototype.testPath = function(path){
  
  var pieces = path.split('.'),
      currPath = this,
      passed = true;
  
  pieces.forEach(function(val){
    if(currPath[val] === undefined){
      passed = false;
    } else {
      currPath = currPath[val];
    }
  });
  
  return passed;
  
};