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 strict keyword name as “use strict”. This is use for follow the rule and regulation of the JavaScript code. This keyword is very important role play in our code. Basically, if we don’t declare the variable in JavaScript then we can assign also we print the value. But when we use the “use strict” keyword above the JavaScript code then the JavaScript strictly follow the role of the programming. And our code didn’t loosely code it become a strong type code. Now given bellow the “use strict” example code and explain the code:
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<script type="text/javascript">
//not declear just assgin also not use the "use strict" keyword .
myValue=25;
console.log("With out use use strict keyword: "+myValue);
</script>
<script type="text/javascript">
// "use strict" code
"use strict";
var myValueTwo=25;
console.log("use use strict keyword: "+myValueTwo);
//not declear just assgin this code should not work.
myValueThree=25;
console.log("use use strict keyword: "+myValueThree);
</script>
</body>
</html>
In this code we see the how to work “use strict” keyword. Once we declare top the JavaScript code “use strict” keyword then we must and should follow the role and regulation otherwise it throws the exception or error in our code.
About Teacher
Comments
