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
Constant look like a ‘var’ or ‘let’ variables but when const value once assign this value never be change. Const only have an option to help with to efficiency how your program run and manages your memory on the computer because you have some data or you have a variable in your program but you know its value never going to be change. The computer can be smart how to know the value never be change. When we use the const then computer know this is constant so the value never changes. This const keyword we use function or object not only variables. Now given bellow the constant example code and explain the code:
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<script type="text/javascript">
// Use let keyword
let a=50;
console.log("With out again assine show the a value :" +a);
a=100;
console.log("Again assine show the a value :" +a);
// Use const keyword
const b=50;
console.log("With out again assine show the b value :" +b);
//This assgin is invelid!
b=100;
console.log("Again assine show the b value :" +b);
</script>
</body>
</html>
We can see the ‘let’ variable to reassign the value and also print the value but constant variables first assign value then prints but when we re assign the value into the constant variable it can’t assign it’s invalid. So constant variable value we can’t reassign the value.
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