I think the problem has to do with object oriented programming and classes. Like when you have an Apple that inherits from Fruit, witch later starts looking li

I think the problem has to do with object oriented programming and classes. Like when you have an Apple that inherits from Fruit, witch later starts looking like a Banana. With prototype you do not have that problem as you copy-paste code instead of couple code. When you rename a variable and have to search more then one function or file, then there are bigger problems with your design, because you are basically using a global variable, even though it's praised as a module. Now does your refactor tool also fix documentation and other peoples code that depends on yours ? function Person(name) { var person = this; person.name = name; } var person = new Person("Jon Doe"); alert("Welcome " + person.name); person.name = "Harry Houdini"; // ES6 example: var messages = people.map( person => person.name += " is a rock star" )