Accordion

• Parsing: Transforming a JSON-formatted string into a native JavaScript object. JSON.parse(jsonString);
• Stringification: Converting a JavaScript object into a JSON-formatted string, commonly used for data transmission or storage. JSON.stringify(object);

The slice() method in JavaScript is used to extract a section of an array, returning a new array containing the selected elements. The slice() method does not mutate (change) the original array; instead, it returns a new array containing the extracted elements.

The splice() method in JavaScript is used to add, remove, or replace elements within an array. Unlike slice(), which creates a shallow copy and does not alter the original array, splice() modifies the original array in place and returns an array containing the removed elements.

A first-order function is a function that doesn’t accept another function as an argument and doesn’t return a function as its return value. i.e, It's a regular function that works with primitive or non-function values.

A Service worker is basically a script (JavaScript file) that runs in the background, separate from a web page and provides features that don't need a web page or user interaction. Some of the major features of service workers are Rich offline experiences(offline first web application development), periodic background syncs, push notifications, intercept and handle network requests and programmatically managing a cache of responses.

IndexedDB is a low-level API for client-side storage of larger amounts of structured data, including files/blobs. This API uses indexes to enable high-performance searches of this data.

Web storage is an API that provides a mechanism by which browsers can store key/value pairs locally within the user's browser, in a much more intuitive fashion than using cookies. The web storage provides two mechanisms for storing data on the client; local storage and session storage.

A cookie is a piece of data that is stored on your computer to be accessed by your browser. Cookies are saved as key/value pairs. For example, you can create a cookie named username as below: document.cookie = "username=John";

Cookies are used to remember information about the user profile(such as username). It basically involves two steps,

• When a user visits a web page, the user profile can be stored in a cookie.
• Next time the user visits the page, the cookie remembers the user profile.

Promises are used to handle asynchronous operations, especially in languages like JavaScript, which often work with non-blocking operations such as network requests, file I/O, and timers. When an operation is asynchronous, it doesn't immediately return a result; instead, it works in the background and provides the result later. Handling this in a clean, organized way can be difficult without a structured approach. Promises are used to:

• Handle asynchronous operations.
• Provide a cleaner alternative to callbacks.
• Avoid callback hell.
• Make code more readable and maintainable.

Promise.all is a promise that takes an array of promises as an input (an iterable), and it gets resolved when all the promises get resolved or any one of them gets rejected.