The Document Object Model (DOM) is a programming interface for HTML and XML documents. It represents the page so that programs can change the document structure, style, and content. The DOM represents the document as nodes and objects.
A Web page is a document. This document can be either displayed…
PWAs should be discoverable, installable, linkable, network independent, progressive, re-engageable, responsive, and safe.
Progressive Web Apps are web apps that use emerging web browser APIs and features along with traditional progressive enhancement strategy to bring a native app-like user experience to cross-platform web applications.
Currying is a transformation of functions that translates a function from callable as f(a, b, c) into callable as f(a)(b)(c).
Currying doesn’t call a function. It just transforms it.
Curried functions are higher-order functions that allow us to create specialized versions of original functions. Currying works thanks to closures, which retain the enclosing function scopes after they have returned.
A Callback function is a functionpassed into another function as an argument, which is then invoked inside the outer function to complete some kind of routine or action.
Here is a quick example:
The above example is the synchronous callback, as it is executed immediately.
Note, however, that callbacks are often used to continue code execution after an asynchronous operation has completed — these are called asynchronous callbacks. A good example is the callback functions executed inside a .then() block chained onto the end of a promise after that promise fulfills or rejects. This structure is used in many modern web APIs, such as fetch().