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Using Data Types in Javascript Tutorial 3

Using Data Types in Javascript Tutorial 3

 

String

You need to use string in double quotation. Here is an example of string

myVariable = "Khan" 

Number

No use of double quotes. Otherwise it will considered as string. Write number or decimal number without double or single quotes.

myVariable = 420 

Boolean

Boolean has only two crew members. True and False. In simple words Boolean is either true or fasle.

myVariable = true 

myVariable = false 

Always write Boolean without double or single quotes.

Array

Array is collection of variables. You can access each member easily.

var myArrayName = [1,'khan',343,"54",343]

How to access elements of array?

myArrayName[0];

Want to Read more about array

Object

A standalone entity, with properties and type. But in simple words it is a custom variable which more than one members.

var person={first_name:"khan", last_name:"babo" age:22, single:true}

Null

Null is a special value. It shows an empty or unknown value

var person = null

Undefined

If you don’t assign a value to a variable and print it. It will print out as null

var person

Infinity

Infinity represent the concept of an infinit number

var person = 32/0 

32 divided by zero is inifinity.