Objects First With Java 6th Edition

Objects First With Java 6th Edition

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Of course, JavaScript also has object prototypes.The difference is that object prototypes are not attached to functionsymbols; they are attached to object symbols. Objects that have an adirectly-assigned prototype can override its behavior, but an object withan object prototype can receive only the properties that are defined on theprototype. Here is an example of a car object that has a revsoundsproperty and a chassenumber property:

function Car() {

this.rev = 0;

this.chassenumber = 0;

}

Car.prototype.chassenumber = function() {

this.chassenumber++;

}

Car.prototype.revsounds = function() {

this.rev++;

}

The reason for this is that you can only use the chassenumberproperty if you get it from the car object itself. For example, the followingstatement does not work:

var Point2D = function Point2D(x, y) {

this.x = x;

this.y = y;

this.move = function(distance) {

this.x = this.x + distance;

this.y = this.y + distance;

}

}

Because the definition of the prototype is delayed until it is used, we cansee that the code for move is only executed once, and it is

defined once. Thus, it is only executed once per object that iscreated. And, because the definition of the prototype is delayed, it canalso be used by other functions; in the example above, it can be used by thefunction Point2D.

The getEvenNumbers function is a little tricky. It makes use of themodulo operator, which is the same as the modulus operator inC++ or Java. The % operator returns the remainder after dividingone number by another. For example:

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To decide which one should you opt for, one needs to look at the business as a whole. Doing so will give a better understanding of how the business functions, how profitable it is, how the management team is doing and what problems it might face in the future. It also helps to determine if there are any other reasons as to why you should or shouldn’t be interested in the company. Companies with a higher ROE are considered more attractive as well as have a higher Return on invested capital (ROIC). This helps determine if you need to invest in the company. 827ec27edc