Basic-To-Advanced-JavaScript/Variables/app.js at main · MaazWebDev/Basic-To-Advanced-JavaScript · GitHub

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//Javascript ready made function use to pop up message on screen

alert("Hello World");

//What are Variables ? Variables are use to store different types of data

//There are 8 types of data :

//1.String Data which is in double or single qoute (e.g "Hello",'World')

//2.Number Data which is not in double or single but in numbers (e.g 20,3000)

//3.Boolean True 0r False Value Only

//4.Null

//5.Undefined Made Variable but no value is assigned

//6.Function

//7.Array

//8.Object

// Var :

var greetings = "Hello World" //String

var noOfStudents = 20 //Number

var isClassGoingOn = true //True

var noOfStudentPass ; //Undefined

// alert(greetings);

console.log(greetings);

console.log(noOfStudents);

console.log(isClassGoingOn);

console.log(noOfStudentPass);

//Rule Of Making Variables :

// 1. Variable should not start with numbers (e.g 1stVariable)

// 2. Variable should not have space in variable name (e.g my variable)

// 3. Variable should not use any special character except dollar and underscore (e.g my_variable)

// 4. Variable should not be on name of javascript keyword (e.g array,loop)

// 5. Best option for variable name is to write variable name is camelcase (e.g myVariableJs)

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