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 the JavaScript have comparison and logical operators. When we compare element then we use comparison operators. Comparison operators are very important to implement any kind of application. Suppose we create a form then we check the “Email” field then we need to check ‘@’ and ‘.’ Symbol then we use the comparison operators. Comparison operators allows return ‘true’ or ‘false’. Given bellow the Comparison operators symbol: >, <, >=, <=, ===, and !== .
On the other hand, Logical operators are also important to compare between two or more element compare at a time. Given bellow the Logical operators symbol: &&, ||, and ! .
We can also work with Comparison and Logical Operators at a time or same line of code. Given bellow the example code and explain the code:
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<script type="text/javascript">
// JavaScript Comparison and Logical Operators
//create three object
var farhan = {firstName:"Farhan", lastName:"Sakib", age:25, eyeColor:"blue"};
var reza = {firstName:"Reza", lastName:"Karim", age:28, eyeColor:"black"};
var tofile = {firstName:"Tofile", lastName:"Ahmed", age:26, eyeColor:"blue"};
//compare betwn two persone
if (farhan["age"]<reza["age"]) {
console.log("Reza is older then farhan");
}
//match must and should two
if (farhan["age"]<reza["age"] && farhan["eyeColor"]!=reza["eyeColor"]) {
console.log("Deferrent eye color between farhan and sakib");
}
//match only one then excicute
if (farhan["eyeColor"]==tofile["eyeColor"] || farhan["age"]==tofile["age"]) {
console.log("There eye color are same !");
}
</script>
</body>
</html>
In this code we create three-person object and compare the parson property and print the message. Also, we use the logical Operators as well as we use the compare operator then if the condition is full fill then we print the output into console windows.
About Teacher
Comments
