Javascript
Is a high-level, interpreted programming language that is commonly used for web development. It is an essential part of web applications, enabling interactive features and dynamic content on websites.
What it is used for:
- Client-side: JavaScript is used to create interactive web pages that can process user input and send requests to the server.
- Server-side: JavaScript is used to create server-side applications that can process requests and send data to the client.
- Desktop and mobile applications: JavaScript is used to create desktop and mobile applications that can work offline and use system resources.
Basic concepts of JavaScript:
- Variables: JavaScript is dynamically typed, which means that variables do not have a fixed type and can store data of any type.
- Functions: JavaScript has first-class functions, which means that they can be passed as arguments to other functions and returned from functions.
- Objects: JavaScript has an object-oriented model, which means that that data and functions can be grouped into objects.
- Arrays: has built-in support for arrays, allowing you to work with collections of data.
- Events: has support for events, allowing you to handle user actions and other events.
Popular JavaScript libraries and frameworks:
- jQuery -> a library for simplifying work with HTML and CSS.
- React -> a library for creating user interfaces.
- Angular -> a framework for creating web applications.
- Vue.js -> a framework for creating web applications.
- Node.js -> a framework for creating server-side applications.
JavaScript code example:
// variable
let name = 'Ivan';
// function
function sayHello(name) {
console.log(`Hello, ${name}!`);
}
// object
let person = { name: 'Ivan', age: 30 };
// array
let colors = ['red', 'green', 'blue'];
// event
document.addEventListener('click', function() {
console.log('Click!');
});
JavaScript also has various operators such as:
- Comparison operators (==, ===, !=, !==)
- Logical operators (&&, ||, !)
- Assignment operators (=, +=, -=, *=, /=, %=)
- Increment and decrement operators (++, --)
JavaScript has the following features:
- Closure
- Hoisting
- this
- Async/await
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