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Object Primer - Cohesion

Tip : An object should be highly cohesive.

Cohesion is a measure of how much an item say for eg. a class or method, makes sense.
Objects with low cohesion are more likely to be changed.

A method is highly cohesive if it does one thing and only one thing.


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JavaScript - The this keyword

"this" is one of the most misunderstood construct in JavaScript.  To understand this first lets go through how to create a construction function in JavaScript.  A constructor function is a function which is used to create instances of objects in JavaScript.

You define a constructor function using the same notation that you use to define a normal JavaScript function.  The convention to follow is to capitalize the first letter of the function name.

This requirement is not enforced by the JavaScript language but it is a generally accepted practice and there are many benefits which we will shortly discuss.

Let's define a constructor function to hold our menu information.

function Menu() { }
So, in the above snippet you have a constructor function named Menu defined. At present this function doesn't do anything good.

Let's see how to invoke this function

var menu = new Menu();
Let's add some public properties to this function.
function Menu() { this.menuName = &q…