Introduction to Object-Oriented JavaScript - MDC Docs

Post by qqqq2010 » Wed, May 04, 2011, 4:57 PM UTC

giberson wrote: post #9

Under the section "The Property (object attribute)" the code segment has two curious lines. I expect the first cancels out the latter, making the latter useless. // in Person function this.gender = gender; // outer scope (gender will never be this value because it is overridden by the person constructor argument) Person.prototype.gender = 'Person Gender'; Am I correct, or does the prototype.gender line have some othe…

  function Person = function(gender) {
      this.gender = gender || 'neuter' //the sauce that defines a fallback
  }

Post by giberson » Wed, May 04, 2011, 7:26 PM UTC

qqqq2010 wrote: post #11

giberson wrote: post #9

Under the section "The Property (object attribute)" the code segment has two curious lines. I expect the first cancels out the latter, making the latter useless. // in Person function this.gender = gender; // outer scope (gender will never be this value because it is overridden by the person constructor argument) Person.prototype.gender = 'Person Gender'; Am I correct, or does the prototype.gender line have some othe…

It's ensuring a default value basically. If you instantiate a person without an argument and try to reference this.gender later, you'll throw a script error. This is just avoiding that. A way I'd prefer might look like this: function Person = function(gender) { this.gender = gender || 'neuter' //the sauce that defines a fallback }

Post by sjs » Sat, May 07, 2011, 2:07 AM UTC

voidr wrote: post #14

sjs wrote: post #12

Earlier quoted context omitted.

Please don't make us start saying "object used as a class".

The first step to learning JavaScript is to forget about class-ical OOP, you can't write good code if you start forcing class-ical concepts on JavaScript, it's a prototypical language encouraging people to treat it as something else is wrong.