Introduction
Environment Setup
What is JavaScript vs ES-5 or ES-6
JavaScript Syntax
JavaScript Comments
JavaScript Use Strict
JavaScript Variables
JavaScript Reserved Words
JavaScript Scope
JavaScript Data Types
JavaScript Function
Function overloading not possible in JavaScript
JavaScript Arrow Function
JavaScript Numbers
JavaScript Number Methods
JavaScript String
JavaScript String Methods
JavaScript if else and else if
JavaScript Comparison and Logical Operators
JavaScript Arrays
JavaScript Sorting Arrays
JavaScript Array Iteration Methods
JavaScript for loop
JavaScript Let keyword
JavaScript Const
JavaScript Objects
JavaScript Object Methods
JavaScript ES5 Object Methods
JavaScript Object Accessors
JavaScript Math Object
JavaScript Random
JavaScript this Keyword
JavaScript Date Objects and Date Formats
JavaScript Classes
JavaScript While Loop
JavaScript Break and Continue
JavaScript Switch Statement
JavaScript JSON
Error handling in JavaScript
In this part we will discuss the JavaScript data type. When we decliner the variable then we assign the value, this value is must and should some data type. JavaScript have six primitive data type like string, integer, Boolean, null, undefined etc. when we declare the variable to contain the value then we use the “var” keyword. Now given bellow the code and explain the code:
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<script type="text/javascript">
//int data type
var myInt=10;
console.log(myInt);
//string data type
var myStr1="Farhan Sakib";
console.log(myStr1);
var myStr2='Reza Karim';
console.log(myStr2);
//bool data type
var a=true;
var b=false;
console.log(a);
console.log(b);
//object data type
var person = {
firstName : "Reza",
lastName : "Karim",
age : 29,
eyeColor : "black"
};
console.log(person.firstName + " is " + person.age + " years old.");
</script>
</body>
</html>
In this code we will show the int data type bool data type string data type also object data type. Object contain at a time many properties. This property will be int, string or others data type. We can see person is an object and this person contain the string and int data type at a time.
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