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<script type="text/javascript"> | |
/* | |
Walking through this page as a tutorial on how Javascripts object model works: | |
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Details_of_the_Object_Model#Class-Based_vs._Prototype-Based_Languages | |
*/ | |
//Function for Employee creates a constructor for Employee objects | |
function Employee() { | |
this.name = ""; | |
this.dept = "General"; | |
this.title = ""; | |
} | |
//Manager is going to inherit from Employee and add a reports property | |
function Manager() { | |
Employee.call(this); | |
this.reports = []; | |
//Setting the title property that Employee setup | |
this.title = "Manager"; | |
} | |
//***I am unsure what this does.*** | |
Manager.prototype = Object.create(Employee.prototype); | |
//Create an instance of an object using the Manager constructor | |
var mintedManager = new Manager(); | |
document.write(mintedManager.title); | |
</script> |
I think I can see reasons to mix new
and object.create
but I think it's a bit confusing to do that. Generally I like to use one or the other, I prefer Object.create and object literals. For example you can have a similar prototype chain with this code:
var employeeProto = {
name: "",
dept: "General",
title: ""
};
function newManager() {
var manager = Object.create(employeeProto);
manager.title = "Manager";
return manager;
}
var mintedManager = newManager();
document.write(mintedManager.dept);
@hypomodern I thanked you on twitter too, but publicly (on this gist that will probably die someday in a gist purge) thank you!
@keller, thanks! Your object literal example makes a lot more sense to me given how its used in this example. It's helpful to understand the options!
"It feels to me like it's trying to trick devs into thinking it's like classical inheritance, which they successfully do trick devs into being confused" I've really really been feeling this as I'm learning about this. I'd actually started looking into it after reading a bit about classes in es6 and wondering what was making them work.
Alternatively you could do something like:
But this is slightly different, it sets the new
Employee
object as the actual prototype.