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
JavaScript have “let” keyword like “var” keyword. But many deference between var and let keyword. Var keyword accessible to ta global of the scope but other side let keyword only accessible their block. However, one the other hand var keyword attach the window property so programmer can access the variable out of the programming but let keyword only access from the program. Now given bellow the example code and explain the code:
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<script type="text/javascript">
function StartVar(){
//using var keyword
for(var i=0;i<=5;i++){
console.log("Inside Value of i: "+i);
}
console.log("Out side Value of i: "+i);
}
StartVar();
function StartLet(){
//using let keyword
for(let i=0;i<=5;i++){
console.log("Inside Value of i: "+i);
}
console.log("Out side Value of i: "+i);
}
StartLet();
</script>
</body>
</html>
In this code we show the var and let keywords how to work. Let keyword work only the inside of the scope and var keyword work out side of the scope. Also, window property attaches the var keyword value but let keyword can’t attach. So let keyword is more secure then var keyword.
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