JavaScript Strict Mode | What is Strict Mode

The strict mode was introduced in ECMAScript 5 (ES5). It is a semantically stricter or restricted version of JavaScript language that produces errors for those mistakes that are handled silently otherwise. For example, in non-strict mode if you initialize a variable without declaring it using the var keyword (e.g. x = 5;), JavaScript interpreter will assume that you were referring to a global variable and if no such variable existed, it will automatically create one.

Also, features that are deprecated may also generate errors in strict mode. Hence, strict mode reduces bugs, improves security and overall performance of your application.

Enabling Strict Mode

To enable strict mode all you need to do is just add the string "use strict" at the beginning of your script, as shown in the following example:

Example

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="utf-8">
    <title>JavaScript Strict Mode</title>
</head>

<body>
    <script>
        "use strict";
    x = 5;
    console.log(x);
    </script>
    <p><strong>Note:</strong> The strict mode was introduced in ECMAScript 5 (ES5).</p>
</body>

</html>

If you add the "use strict" directive as the first line of your JavaScript program, strict mode applies to the entire script. But, you can also turn on strict mode only within a function, like this:

Example: 

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="utf-8">
    <title>JavaScript Enable Strict Mode inside the Function</title>
</head>

<body>
    <script>
        x = 5;
    console.log(x);
    
    function sayHello() {
        "use strict";
        str = "Hello World!";
        console.log(str);
    }
    sayHello();
    </script>
    <p><strong>Note:</strong> The strict mode was introduced in ECMAScript 5 (ES5).</p>
</body>

</html>

Note: The "use strict" directive is only recognized at the beginning of a script or a function. All modern browsers support "use strict" directive except Internet Explorer 9 and lower versions. Additionally, the browsers that don't support the "use strict" directive silently ignore it and parse the JavaScript in non-strict mode.

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JavaScript Strict Mode | What is Strict Mode

JavaScript Strict Mode - 7

Multi-paradigm is a term in computer programming that allows different styles of programming. That is the ability to structure code in different ways…

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What is JavaScript - Stackfindover - Blog

Who invented JavaScript, how it works, as we have given information about Programming language in our previous article ( What is PHP ), but today we will talk about what is JavaScript, why JavaScript is used The Answers to all such questions and much other information about JavaScript, you are going to get here today. Hope this information will work for you.

Who invented JavaScript?

JavaScript language was invented by Brendan Eich in 1995. JavaScript is inspired by Java Programming Language. The first name of JavaScript was Mocha which was named by Marc Andreessen, Marc Andreessen is the founder of Netscape and in the same year Mocha was renamed LiveScript, and later in December 1995, it was renamed JavaScript which is still in trend.

What is JavaScript?

JavaScript is a client-side scripting language used with HTML (Hypertext Markup Language). JavaScript is an Interpreted / Oriented language called JS in programming language JavaScript code can be run on any normal web browser. To run the code of JavaScript, we have to enable JavaScript of Web Browser. But some web browsers already have JavaScript enabled.

Today almost all websites are using it as web technology, mind is that there is maximum scope in JavaScript in the coming time, so if you want to become a programmer, then you can be very beneficial to learn JavaScript.

JavaScript Hello World Program

In JavaScript, ‘document.write‘ is used to represent a string on a browser.

<script type="text/javascript">
	document.write("Hello World!");
</script>

How to comment JavaScript code?

  • For single line comment in JavaScript we have to use // (double slashes)
  • For multiple line comments we have to use / * – – * /
<script type="text/javascript">

//single line comment

/* document.write("Hello"); */

</script>

Advantages and Disadvantages of JavaScript

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The essential JavaScript concepts that you should understand

As a JavaScript developer of any level, you need to understand its foundational concepts and some of the new ideas that help us developing code. In this article, we are going to review 16 basic concepts. So without further ado, let’s get to it.

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