javascript notebook

Subjects covered include:

Getting started with JavaScript

JavaScript Variables

Built-in Constants

Comments

Console

Datatypes in JavaScript

Strings

Date

Date Comparison

Comparison Operations

Conditions

Arrays

Objects

Arithmetic (Math)

Bitwise operators

Constructor functions

Declarations and Assignments

Loops

Functions

Functional JavaScript

Prototypes, objects

Classes

Namespacing

Context (this)

Setters and Getters

Events

Inheritance

Method Chaining

Callbacks

Intervals and Timeouts

Regular expressions

Cookies

Web Storage

Data attributes

JSON

AJAX

Enumerations

Map

Timestamps

Unary Operators

Generators

Promises

Set

Modals - Prompts

execCommand and contenteditable

History

Navigator Object

BOM (Browser Object Model)

The Event Loop

Strict mode

Custom Elements

Data Manipulation

Binary Data

Template Literals

Fetch

Scope

Modules

Screen

Variable coercion/conversion

Destructuring assignment

JavaScript is often abbreviated as JS, is a high-level, interpreted programming language that conforms to the ECMAScript specification. It is a language that is also characterized as dynamic, weakly typed, prototype-based and multi-paradigm.

Alongside HTML and CSS, JavaScript is one of the three core technologies of the World Wide Web. JavaScript enables interactive web pages and thus is an essential part of web applications. The vast majority of websites use it, and all major web browsers have a dedicated JavaScript engine to execute it.

As a multi-paradigm language, JavaScript supports event-driven, functional, and imperative (including object-oriented and prototype-based) programming styles. It has APIs for working with text, arrays, dates, regular expressions, and the DOM, but the language itself does not include any I/O, such as networking, storage, or graphics facilities, relying for these upon the host environment in which it is embedded.

Initially only implemented client-side in web browsers, JavaScript engines are now embedded in many other types of host software, including server-side in web servers and databases, and in non-web programs such as word processors and PDF software, and in runtime environments that make JavaScript available for writing mobile and desktop applications, including desktop widgets.

The terms Vanilla JavaScript and Vanilla JS refer to JavaScript not extended by any frameworks or additional libraries. Scripts written in Vanilla JS are plain JavaScript code.

Although there are similarities between JavaScript and Java, including language name, syntax, and respective standard libraries, the two languages are distinct and differ greatly in design; JavaScript was influenced by programming languages such as Self and Scheme.

JavaScript has become one of the most popular programming languages on the Web. However, many professional programmers initially denigrated the language due to the perceived target audience of Web authors and other such "amateurs".[ The advent of Ajax returned JavaScript to the spotlight and brought more professional programming attention. The result was a proliferation of comprehensive frameworks and libraries, improved JavaScript programming practices, and increased usage of JavaScript outside Web browsers, as seen by the proliferation of Server-side JavaScript platforms.

In January 2009, the CommonJS project was founded with the goal of specifying a common standard library mainly for JavaScript development outside the browser.

With the rise of single-page applications and JavaScript-heavy sites, it is increasingly being used as a compile target for source-to-source compilers from both dynamic languages and static languages.

JavaScript was initially developed in 1996 for use in the Netscape Navigator Web browser. In the same year Microsoft released an implementation for Internet Explorer. This implementation was called JScript due to trademark issues. In 1997, the first standardized version of the language was released under the name ECMAScript in the first edition of the ECMA-262 standard.