Build more powerful JavaScript code

Nice, short overview.

I use OO JS by preference, including class inheritance when appropriate. (Though I've done little with class inheritance in a while, as I've not done any large applications in JS in several years.)

I find it easier to manage and understand the code, if a little more verbose,
to place the methods *outside* the constructor. For example:

    function CObject() { 
        this.count = 0;
        this.number = 1;

        this.sayCount = CO_sayCount;
        this.addCount = CO_addCount; 
    } 

    function CO_addCount() {
        this.count++; 
    }; 

    function CO_sayCount() {
        alert(this.count); 
    };

    var myObject1 = new CObject(); 
    var myObject2 = new CObject(); 
    myObject1.sayCount(); 
    myObject2.sayCount(); 
    myObject1.addCount(); 
    myObject1.sayCount(); 
    myObject2.sayCount(); 

See my other reply for comments on inheritance.

- SamR

You mention that using prototype allows class inheritance (if in a primitive form). You don't say how. It's simply by assigning a new prototype object of the parent class to the new class' prototype instance:

function myClass() {
this.newMethod = MC_newMethod;
}
myObject.prototype = new parentClass();
myObject.prototype.attribute1 = "default value";

Any new methods defined in myClass then extend or override those in the prototype.

The default values for the prototype may then be assigned to it directly, as shown above.

By default (i.e., if no specific prototype object is assigned) the class prototype is an Object.

- SamR