Say we want a random number from 5-15 (including both 5 and 15 as possible results). Functions declared this way will have access to any public or prototype variables.I'll explain this formula: Math.floor(Math.random() * (myMax - myMin + 1) + myMin)

Can be accessed by any function or method and can call reference or change any Private variable.ĭeclare with ‘’ or ‘’. To understand this, let’s take a look at a simple example: Objects allow you to define a variable and then set any number of properties on that variable.

To begin with we need to explain how Objects work in Javascript. If you are familiar with any Class-based OO language, prototyping might seem a weird concept at first, but it offers as much power, and often much more flexibility in programming style than other methods. We use nested functions a concept called Prototyping to accomplish the same thing as languages with Class structures. Instead of using Classes to create objects, every function in JavaScript can effectively act as a class. JavaScript differs slightly from the standard Class OO structure. We would have properties like brand name, screen size, etc and Methods like turn on/off, change channel, etc. This Class would define our television’s methods and properties. Since all televisions more or less work the same, there is no reason to redefine many attributes of our television in order to make a new one. We might have a Television Class, for instance. Every function in a class ideally works with variables and other functions internal to that Class.Ĭlass structure, and objects in general, work well because they work like real life objects. In terms of structure, we have Classes then inside of this Class we have functions and variables, and inside each of these functions we have more variables.

Put simply, Classes in these languages allow us to quickly create objects with the same properties and methods without having to redefine all of these properties and methods.

If you are familiar with C, Java, VB, php or any similiar language, you are probably familiar with the Class structure of those languages. This is the eighth in a series that will introduce you to the JavaScript language.Īlmost every modern programming language has some method of writing Object Oriented (OO) code.

Java script basics