What is Java Script ?
JavaScript is a popular programming language for developing interactive and dynamic web sites. It turned into at the start evolved inside the mid-1990s as a purchaser-facet scripting language for the internet. JavaScript lets in builders to add interactive elements to internet pages, together with animations, forms, and buttons that respond to user enter. It is also used at the server facet to create net packages and can be incorporated with different technology like Node.Js and databases to create full stack internet packages JavaScript is a flexible language broadly utilized in web development and by developers organization length and sources
Why JavaScript is Important :-
- Client-Side Interactivity: JavaScript enables the advent of interactive web pages which could respond to consumer movements in real-time. This enhances the user enjoy and makes websites greater enticing and interactive.
- Versatility: JavaScript may be used for both the front-give up and returned-end web improvement, making it a flexible language that can be used to construct complex net programs.
- Popularity: JavaScript is one of the maximum widely-used programming languages and has a huge network of developers and assets to be had. This method that it is easy to discover guide, analyze new capabilities, and locate answers to commonplace programming problems.
- Compatibility: JavaScript may be run on all most important net browsers, which means that builders can create web programs that work on more than one structures and gadgets.
- Integration: JavaScript may be included with other technology like HTML, CSS, and databases to create effective web applications which can perform complicated functions and duties.
How to use JavaScript in HTML ?
Create an HTML report: Start through developing an HTML report the usage of a textual content editor like Notepad, Sublime, or Visual Studio Code.
Link to the JavaScript report: To upload JavaScript on your HTML document, you may either write your code without delay into the HTML file the usage of the <script> tag or hyperlink to an outside JavaScript document the use of the <script src="document.Js"></script> tag.
Write JavaScript code: Once you've got related to the JavaScript document, you may start writing your code inner a <script> tag. You can write your code without delay in the HTML report or in a separate .Js report which you hyperlink to using the <script> tag.
Add JavaScript to HTML factors: You can use JavaScript to govern HTML factors by way of deciding on them the use of the report object and converting their houses. For example, you can use JavaScript to exchange the text content material of a <p> tag or to alternate the history shade of a <div> element.
Test your code: Once you've got written your JavaScript code, store your report and open it in a web browser to check your code. You can open the developer console in your browser to see any errors or debug your code.
Example :-
<!DOCTYPE html>
<html>
<head>
<title>JavaScript Example</title>
</head>
<body>
<h1>JavaScript Example</h1>
<p id="demo">This is a paragraph.</p>
<button onclick="changeText()">Click me</button>
<script>
// JavaScript code goes here
function changeText() {
document.getElementById("demo").innerHTML = "The text has been changed!";
}
</script>
</body>
</html>
Data Types in JavaScript:-
- String: A string is a sequence of characters enclosed in single or double quotes. Strings are used to represent text and can contain letters, numbers, and symbols.
- Number: A number can be an integer, a floating-point number, or a special numeric value like Infinity or NaN.
- Boolean: A boolean value can be either true or false. Boolean values are used for logical operations and conditions.
- Array: An array is an ordered list of values, which can be any type of data. Arrays are used to store collections of data.
- Object: An object is a collection of key-value pairs, where the keys are strings and the values can be any type of data. Objects are used to represent complex data structures.
- Null: Null is a special value in JavaScript that represents the absence of any object value.
- Undefined: Undefined is a special value in JavaScript that represents a variable that has been declared but not assigned a value.
- Symbol: Symbol is a new data type introduced in ECMAScript 6 that represents a unique identifier.