What is javascript used for

What is javascript used for

CSS is used to control and customize the look of the web page, including the colors, fonts, etc. This attribute may be used with the INPUT and TEXTAREA elements. I believe that spending your time on these topics will  This document is an introduction to the JavaScript Programming Language for Strings have a length member which is used to determine the number of  Jan 31, 2019 In this ultimate beginners guide, you will get to know what are the potential uses of JavaScript and What is JavaScript Used For Today as of  Jun 26, 2019 This part of the tutorial is about core JavaScript, the language itself. [ [25, 55], [21, 56], [22, 58], [28, 56] ]. JavaScript void is often used when, inserting an expression into a web page may produce an unwanted side-effect. Now that JavaScript has “grown up,” the comparison is much more complicated. Python has procedural programming whereas Java-Script does not have. is using a semi colon at the end of a statement mandatory>. When we define our faithful function doSomething() in a page, its owner is the page, or rather, the window object (or global object) of JavaScript. What, then, is a JavaScript Library? And we  So, it's now possible to write JavaScript, for development. Best JavaScript Frameworks, Libraries and Tools to use in 2017. JavaScript is most commonly used as a client side scripting language. What you're doing is creating an object using a literal declaration and json notation. JavaScript can be embedded directly into HTML, implemented as a framework or library; Java can be used as a Java applet. The <script> element either contains script statements, or it points to   JavaScript can update and change both HTML and CSS. It is lightweight and most commonly used as a part of web pages, whose implementations allow  Nov 14, 2016 Doug Winnie describes how JavaScript is used by coders and programmers. It is used all over the  It's used by the other plugins to check for CSS transition support and to catch hanging transitions. JavaScript has a syntactic similarity to Java, much as Java has to C. A JavaScript statement is a command to a browser. Sep 4, 2018 JavaScript is a flexible and powerful programming language that is JavaScript can be used in both the front-end and back-end of web  This lesson introduces you to JavaScript, which allows you to put code For a world that was just getting used to the idea of the world wide web, this was a  Jun 29, 2019 JavaScript is a client-side as well as server side scripting language that can be inserted Which symbol is used for comments in Javascript? JQuery is referred to as a programming language, but in the opinion of the JQuery team, it Is a JavaScript library. But the problem with HTML is that it is completely static, providing no capabilities to implement logic. Learn what strict mode restricts and how it works. Instead of a webpage just being a plain page that has no interactivity, JavaScript is an implementation of the ECMAScript language standard and is typically used to enable programmatic access to computational objects within a host environment. . It is an untyped,  Things get a touch hairy when we pass a method (that uses this) as a parameter to be used  Feb 23, 2017 There is no difference between web JavaScript and Node. He'll discuss JavaScript in general and look JavaScript is a logic-based programming language that can be used to modify website content and make it behave in different ways in response to a user's actions. TypeScript sits in between these two extremes, thus balancing the risk. Java has long been used to power back-end technologies like Apache, JBoss, and WebSphere. The Name. React uses a special syntax called JSX which allows you to mix HTML with JavaScript. js is a progressive, incrementally-adoptable JavaScript framework for Scoped Slot warns when used inside of dynamic component on regular element. So in a nutshell, HTML, DHTML and Javascript are all programming languages that are used to make your web pages look and act the way we do. JavaScript is widely used and reaps both of the aforementioned benefits: These days, documentation and support for JavaScript comes in all shapes and sizes: books, podcasts, blog posts, email newsletters, forums, and more. That's true. Jun 21, 2019 JAVA AND JAVASCRIPT remain the most popular programming languages used by coders. It’s used for handling view layer for web and mobile apps. If you’re not sure what a JavaScript (or client-side) framework is, that’s a technology providing us the right tools to build a web application while also defining how it should be designed and how the code should be organized. The modulus operator behaves differently for special values: If the operands are numbers, regular arithmetic division is performed, and the remainder of that division is returned. , "text/javascript"). Jul 2, 2019 So there you go, your first step into the world of JavaScript. They are used by websites to carry out more complicated operations. Most of the functions and applications that make the Internet indispensable to modern life are coded in some form of JavaScript. It is better than Java in the applications that Java (fka Oak) was originally intended for. It is lightweight and most commonly used as a part of web pages, whose implementations allow client-side script to interact with the user and make dynamic pages. It was originally intended to do small tasks in webpages, tasks for which Java was too heavy and clumsy. Generally speaking, it is used to allow Website developers to create web pages that have some intelligence built in to them. In history, it hasn't been used as a development language. JavaScript is a programming language that can run inside nearly all modern web browsers. Additionally, if your JavaScript setting is set to 'Prompt', you may encounter a warning about downloading potentially dangerous scripts from a website that displays Google ads. Now, while HTML and DHTML are fundamental parts of your browser, Javascript, for various reasons can be turned off. The Online Coding & Design School With A The combination of client and server rendering is known as Isomorphic JavaScript. Note that the changes can only be seen by you and are not permanent. A library is a JavaScript file that contains a bunch of functions, and those functions accomplish some useful task for your webpage. The purpose of the command is to tell the browser what to do. It seems there are more JavaScript frameworks, libraries, and tools than there are developers. js. What Can the Attacker Do with JavaScript? Java is not, however, the same as JavaScript. What does “this” actually mean and how is it decided? This article tries to clear up the confusion and explain the answer in a clear fashion. js in terms of the language used. No, but its good practice and it allows you to write multiple statements on a line. There are 500 thousand usable packages on npmjs. Before it, sites were static HTML sites with formatting and no interactivity. Common uses for JavaScript include confirmation boxes, calls-to-action, and adding new identities to existing information. A common usage of JavaScript:Void(0) is with hyperlinks. JavaScript adds behavior to the web page where the web page is capable of responding to actions by your visitors without needing to load a new web page in order to process their request. JavaScript is a type of scripting language—coding languages used to automate website processes so web developers don’t have to individually program each instance of the process that appears on a page. to/2GZ0C46 Laptop that I use: https://amzn. In JavaScript’s case, it’s used specifically to create, add, and manage dynamic website content. Most of the internet browsers support JavaScript, which allows dynamic content to get displayed beautifully on web pages. The attacker can use injected scripts to change the content of the website or even redirect the browser to another web page, for example, one that contains malicious code. This means that JavaScript code is written into an HTML page. In JavaScript, closures are created every time a function is created, at function creation time. In modern implementations, JavaScript code may be either interpreted or compiled using a just-in-time (JIT) compiler. It can be used to create games, APIs, scrolling abilities and much more. JavaScript was initially pretty basic, and was used for things like alert boxes and menus that appeared when you hovered your mouse over elements on the page. JavaScript is a programming language used primarily by Web browsers to create a dynamic and interactive experience for the user. Can we use them for manipulating the DOM? Or, are people who use higher-order functions showing off? Are they over-complicating code for no good reason? I happen to think higher order functions are useful. It's like oxygen for the Web Developers, without JavaScript nearly all the websites will be  In this article, we discuss what JavaScript can be used for on the web, its downsides, and how to use it responsibly. The visual programming language Max, released by Cycling '74, offers a JavaScript model of its environment for use by developers. JavaScript is a scripting language that was designed for use within a web browser. Most JS frameworks these days are opinionated, meaning they have their own philosophy JavaScript is used primarily for programming the web browser (so-called “front-end” development). org is the easiest way to find information about your browser, and share it to your designer, developer, or support rep. Toggle a modal via JavaScript by clicking the button below . JavaScript renders web pages in an interactive and dynamic fashion. JavaScript is used in Web development to do such things as: Automatically change a formatted date; Cause a linked-to page to pop up in a new window; Cause text or an image to change during a mouse rollover; A JS file is used mainly to run client side JavaScript code on a webpage. Being familiar with classes is extremely helpful, as popular JavaScript libraries such as React make frequent use of the class syntax. In this free lesson from video2brain's course, Getting Started with JavaScript Programming, Joe Chellman explains what JavaScript is and what it does. When a user requests an  Jan 28, 2019 There are a number of different places where JavaScript can be used but the most common place to use it is in a web page. The placing of JavaScript in the above location differs in the timing of their execution. What is JavaScript ? JavaScript is a dynamic computer programming language. This can make your code cleaner, faster and more secure. It can be characterized as a prototype-based object-oriented scripting language that is dynamic, weakly typed and has first-class functions. Aurelia framework is the latest version of the JavaScript, which can be used to implement any interface. JavaScript uses function-based scoping as the variable can be accessed in the function. 1 million JavaScript projects. That's 2. JavaScript is a scripting language, that is, a lightweight programming language that is interpreted by the browser engine when the web page is loaded. JavaScript is one of the most versatile languages ever created  Jul 11, 2018 Each work hand-in-hand when it comes to building websites, but the focus of this blog post is on JavaScript and how it's used. LearnCodeOnline. The fact that the JavaScript interpreter is the browser engine itself accounts for some inconsistencies in the way your JavaScript-powered page might behave in different browsers. This free, open-source software is a wrapper around JavaScript. The internet is full of web design inspiration , including great examples of JavaScript being used to bring a website to life and provide great user experiences. JavaScript is not a compiled language, but it is a translated language. Example Javascript can be used to accept user feedback through online forms. Setting up JavaScript functionality. Unlike Array prototype methods like sort() and reverse() that are used on the array instance, Object methods are used directly on the Object constructor, and use the object instance as a parameter. Java-Script has; as statement terminator whereas python has a newline. It is used to enhance HTML pages and is commonly found embedded in HTML code. JavaScript is mostly used on web browsers and rely on HTML and CSS due to which it is not available globally. But that's an  Vue. Later on, you' ll Now, it can be used for JavaScript modules. Secondarily, it is used on the server side with Node, on the desktop side with Electron, and on the mobile side with React Native (as well as Cordova Enable JavaScript. Isomorphic means the application uses the same rendering engine on the client and the server, thus making it easier for developers to maintain markup templates. jQuery is used to easily write client-side JavaScript to navigate and manipulate a page and make asynchronous Ajax callbacks. JavaScript is a programming language commonly used on web pages (among other things). Cross-site Scripting may also be used to deface a website instead of targeting the user. Apr 25, 2017. JavaScript is used to add a dynamic component to the web page and make most elements on the page programmable. React was first created by Jordan Walke, a software engineer working for Facebook. JavaScript is an object-based scripting language which is lightweight and cross-platform. It is not related to the programming language Java. However, JavaScript has become much more than that. There was a time, though, that every web dev included jQuery just so they could select document object module (DOM) elements for simple innerHTML, and it made a noticeable impact on page-load times. jQuery was invented because browsers did things wildly differently, and the JavaScript API didn't have much to it. JavaScript is commonly placed into an HTML or ASP file and runs directly from the web page and today is the most popular programming language. JavaScript can be used to run on frontend whereas python is on server side programming or backend. Thus, it doesn't need to be compiled. JavaScript can be used to perform more advanced tasks such as printing the time and date, creating a calendar, or other tasks that are not possible in HTML. For example, you can use a special JavaScript construct called the onLoad event handler to trigger an action — play a little welcoming tune, perhaps — when the document is loaded onto a Web browser. Slideshows and other interactive components are typically done using JavaScript. Node. The scripting language is specified as a content type (e. Although Java and JavaScript have many external similarities such as name and syntax, the two languages follow different design principles. JavaScript is a young-for-its-age language. But JavaScript is a very capable language, and it is now being used in larger projects. Along the way, you saw a few code examples and learned how JavaScript fits in with the rest of the code on your website, amongst other things. JavaScript is used literally everywhere on the internet. JavaScript is a very powerful client-side scripting language. If we traveled back in time about five years or so, this would be a simple comparison: Java is a general purpose programming language, and JavaScript is used on websites to make them animated and interactive. Obfuscation can be used to hide business logic from the outside world, and it will drastically reduce the size of the file, so data transfers between server and client will be fast. ReactJS basically is an open-source JavaScript library which is used for building user interfaces specifically for single page applications. But these are two different tools for making it easier to implement JavaScript code. You should be familiar with the difference between primitives and objects [1]. com is a resource for the JavaScript community. Jun 29, 2016 Could JavaScript malware could become a bigger threat than Java? JavaScript is one of the 3 core technologies used to create content for  Let's have a look at some of the best front-end JavaScript frameworks that rules the app development industry and the pros & cons of each of the JS frameworks. JavaScript is generally used within HTML documents (like web pages) rather than as It is a good idea to double-check that JavaScript is still enabled if you notice problems displaying Google ads. The framework of Aurelia can extend the HTML for various purposes, including data binding. some folks in this thread have convinced me to regard spacebar alignments as an antipattern, because such alignments are very brittle, being easily broken by almost any refactor action (such as simple I shall expound on the preceding jQuery example: The use of $(this), which is jQuery’s syntax for the this keyword in JavaScript, is used inside an anonymous function, and the anonymous function is executed in the button’s click () method. The Java Runtime Environment (JRE) is what you get when you download Java software. JavaScript placed in the HEAD section of HTML will be executed when called whereas, JavaScript placed in the BODY section of HTML will be executed only when the page is loaded. Many of the features that were intended to make the language easy to use are troublesome for larger projects. We've begun with just theory, to start getting you used to why you'd use JavaScript  The HTML <script> Tag. This term is used to differentiate it from regular JavaScript, which is predominantly used on the client-side (also referred to as client-side JavaScript or CSJS for short). By using JavaScript:Void(0), you can eliminate the unwanted side-effect, because it will return the undefined primative value. In fact, I think they are one of the most important features of JavaScript as a language. Google Maps is a prime example that JS works with web apps. It was originally developed by Netscape as a means to add dynamic and interactive elements to websites. TypeScript is not a risky choice by any standard. . Javascript doesn't have structs, in the C sense. JavaScript is also being used widely in game development and Mobile application development. JavaScript 'use strict' triggers the JavaScript engines to throw errors for common poor coding practices and honest mistakes. In a nutshell, JavaScript is a dynamic scripting language supporting prototype based object construction. JavaScript was initially created as a browser-only language, but is now used in many other environments as well. It just creates an li element, sets the text of the element to the parameter, and appends the list item to the ul. Contrary to popular misconception, JavaScript is not "Interpreted Java" . Chapter 33 points you toward important resources. In the early days of the web, the language was used to create simple scripts that did handy things, like check to make sure you filled out all the "required" fields on a form before you hit submit. JavaScript is one of the most versatile languages ever created and can be used to code applications for the browser, desktop, phone or tablet using native JavaScript coding, or through frameworks that are built on top of the core JavaScript language. When a user requests an HTML page with JavaScript in it, the script is sent to the browser and it's up to the browser to do something with it. Also with JS technologies developers can create games, animated 2D/ 3D graphics, full-scale database apps. JavaScript is a dynamic computer programming language. JavaScript is used for relatively simple functions such as popping up new windows, or checking the information you type into a form to make sure it conforms to what the receiving database expects. JavaScript’s typeof is a complicated beast – it can be used for many things, but also has many quirks. But, hey, even  May 8, 2018 Have you ever wondered whether it's possible to do anything on the web without JavaScript? How many sites use progressive enhancement in  Today's WordPress developers need to understand a variety of JavaScript methods and frameworks. The JRE is the runtime portion of Java software, which is all you need to run it in your Web browser. What JavaScript can be used for The Hyper Text Transport Protocol, or HTTP , was designed to do exactly what the name implies, which is to transport HTML text across a network for viewing. Back-End Development. Apr 10, 2019 Design patterns in modern JavaScript development The singleton pattern isn't one of the most widely used ones, but we're starting here  Apr 9, 2018 JavaScript is the most popular programming language, used by 9. Java is interpreted Java. Examples of other HTML objects that you interact with using JavaScript include windows, text fields, images, and embedded Java applets. Jun 21, 2015 JavaScript is one of the most popular and dynamic programming languages used for creating and developing websites. I’ll call the function liMaker(). Internet Explorer Mozilla Firefox Google Chrome Opera Apple Safari Javascript is disabled in your web browser. You will find resources and examples Notice how the TypeScript defines the type of member variables and class method parameters. JavaScript can calculate JavaScript arrays are used to store multiple values in a single variable. The JRE consists of the Java Virtual Machine (JVM), Java platform core classes, and supporting Java platform libraries. JavaScript creates platforms that can engage a user and ensure that they remember your site and continue to revisit. If the dividend is Infinity or the divisor is 0, the result is NaN. JavaScript. The general structure for placing a JavaScript in the HEAD section is: Another major advance to JavaScript and Ajax is the JavaScript object library called jQuery. Isomorphic JavaScript is one of those fancy sounding computer science terms. The user's browser interprets the script, that is, analyzes and immediately executes it. A commonly used feature of JavaScript is the “this” keyword, but it is often also one of the most confused and misinterpreted features of the language. Checking whether a variable exists and has a value. As of May 2017, a quick search on GitHub reveals more than 1. Web Applications: As universal tool JavaScript also can be used for web application development. It is actually the next generation of the framework for developing far more robust websites. Typically, JavaScript is used for interface interactions. We've begun with just theory, to start getting you used to why you'd use JavaScript and what kind of things you can do with it. The Purpose of JavaScript Is to Solve This Problem. It’s the basis on which the entire layout is created. Jun 12, 2019 This post will cover what I have found to be the most-used JavaScript topics in my career. Check out our guide for all the details and differences. It is an interpreted programming language with object-oriented capabilities. HTML describes the page, including the text, graphics, etc. JavaScript is an interpreted language. JavaScript is a different language. But it is no more a subset of Java than Java is a subset of C. Next, I’m going to make a function that creates an li element, since I’ll be doing that more than once. https://courses. in What is JavaScript and where can we use it Desktop: https://amzn. For the 'used extensively' part, Jan 20, 2012 JavaScript's typeof is a complicated beast – it can be used for many things, but also has many quirks. g. How do we know what functions we can use? We could look at the JavaScript file, if it's short, or better, What browser am I using? What version is my browser? WhatsMyBrowser. Understanding prototypical inheritance is paramount to being an effective JavaScript developer. Generally speaking, it allows websites to have a bit of interactivity built into them; to allow websites to update individual parts of a webpage (instead of having to reload the entire page); JS is a file extension for a JavaScript source code file format. This post lists its use cases, points out problems and presents alternatives. onchange  Feb 22, 2019 JavaScript Tutorial - JavaScript is a very powerful client-side scripting language, introduced to “make webpages alive”. This article covers the most common methods you'll see in. The JavaScript Translator (embedded in the browser) is responsible for translating the JavaScript code for the web browser. JavaScript is used mainly for enhancing the interaction of a user with the webpage. This language is  I'm just starting out with JavaScript and to me, it seems like the Internet can't decide on loving or hating JS. Beyond that, Bootstrap’s core CSS will also add helpful styling to forms, tables, buttons, lists, and images, as well as fully functioning navigation bars, JavaScript often abbreviated as JS, is a high-level, interpreted programming language that . map(function(pair) { // array literal +  Oct 18, 2018 Learn what JavaScript is, what JavaScript is used for, and why we use JavaScript as a programming language. js is  May 10, 2016 You have probably heard of JavaScript, a programming language used to build this very web page and billions of other things in the internet. Strict mode improves JavaScript code by enforcing better programming practices and eliminating some of the language’s insecure and ill-advised features. JavaScript allows for you to create a sign-up form that takes people's basic information and then allows you to create a messaging option where they can talk to other people. JavaScript (JS) is front-end web development: nearly everything you interact with on a website is thanks to this script. Today, JavaScript has a unique position as the most widely-adopted browser language with full integration with HTML/CSS. It allows users to reduce visual clutter by using an object for a task rather than many. For example, a lot of sites still try to pop-up new windows against your wishes, or cover the content with advertising until you click a link to get rid of it. JavaScript is a high-level, interpreted programming language for computers. They are used here to demonstrate JavaScript's inherent functional nature. This is known as a static method. The component-based approach, well-defined lifecycle, and use of just plain JavaScript make React very simple to learn, build a professional web (and mobile applications), and support it. Unfortunately, there is a lot of  JavaScript is used literally everywhere on the internet. JavaScript injection is a process by which we can insert and use our own JavaScript code in a page, either by entering the code into the address bar, or by finding an XSS vulnerability in a website. How to Use JavaScript Injections. There are many, many things that it can be used for. to/2Goui9Q Wal Skip navigation Sign in JavaScript is a multipurpose programming language. HotMail being one big example. It’s used to build the side of the site that the user sees and interacts with. This is removed when translating to JavaScript, but used by the IDE and compiler to spot errors, like passing a numeric type to the constructor. JavaScript can be used for small projects, with simple functions such as carousels, image galleries, changing layouts, and responsive button presses. That's according to State of Developer Ecosystem  Jul 4, 2018 It is time that we have a quick look at some highlights from 2017 State of JavaScript report on the usage of JavaScript across different industries. This can be a bit confusing since Java also runs in your browser, but JavaScript is used to create client-side dynamic pages. A JavaScript function is a block of code designed to perform a particular task. It is widely used in sign-up forms to accept an individual's username and password. 7M developers. JavaScript, PHP and Perl are three of the most commonly-used programming languages on the Internet. React also allows us to create reusable UI components. js has become a launch pad for JavaScript-powered servers. At the same time, JavaScript allocates  Jun 3, 2012 I want to help JavaScript developers understand how JS engines work. 4M developers more than the next most-popular  Mar 11, 2019 How I used almost no JavaScript to build a modern web app. Edit: I'm not sure whether it's accurate to say that you're using json notation, or to say that javascript object literals and json follow the same pattern. Webstorm I haven't used a lot but I have used PHPStorm a ton, and it's a superset of that functionality. Here you can find instructions on how to enable (activate) JavaScript in five most commonly used browsers. ReactJS is just simpler to grasp right away. Both languages can be used on the server-side. In addition, JavaScript is frequently turned off in browsers because of security concerns, or because JavaScript is often used to annoy people rather than to improve their experience. But that doesn’t stop some sites from requiring it. JavaScript used in browsers and in Node. So there you go, your first step into the world of JavaScript. But JS changed that as the first client-side language. What browser am I using? What version is my browser? WhatsMyBrowser. In other words, you can make your webpage more lively and interactive, with the help of JavaScript. We can use Javascript in Selenium Webdriver. What is the Use of Strict in Javascript The usage of "use strict" in JavaScript indicates that the code should be executed in strict mode. A JavaScript function is executed when "something" invokes it (calls it). In JavaScript this always refers to the “owner” of the function we're executing, or rather, to the object that a function is a method of. It's like oxygen for the Web Developers, without JavaScript nearly all the websites will be as uncool as ever. Learn JavaScript or free with our easy to use input output machine. JavaScript is extensively used by the web developers to create various web applications and to add interactive features to them. It is often run in web browser applications to create things that work by themselves like a popup message or a live clock. JavaScript is an easy to learn and also powerful scripting language, widely used for controlling web page behavior. Whereas the other tools mentioned above provide granular insights on a page-by-page basis, DeepCrawl (disclousre: I work for DeepCrawl) can be used to render JavaScript across all of the different Why Typescript should be used in large-scale projects, and how you would implement it into a project that uses Node and Express. Server-side JavaScript (SSJS) refers to JavaScript that runs on server-side and is therefore not downloaded to the browser. In fact, they don't have a ton of similarities besides their names. By definition, “TypeScript is JavaScript for application Use special indent styles that remove the need for alignment, or carefully align using spaces with tooling that frequently fights such goals. org with almost 10 billion downloads every month. It takes very little effort to get used to if you are familiar with JavaScript, since it is not a completely different language, has excellent JavaScript interoperability support and it has seen a lot of adoption recently. LibreOffice, an office application suite, allows JavaScript to be used as a scripting language. A search box that accepts user inputs, based on which search results are rendered, makes use of Javascript. The grid is probably one of the most essential aspects of the framework. At run time, the browser decides whether (parts of) script code should be JIT-compiled for better performance. There are many languages that get “transpiled” to JavaScript and provide certain features. JavaScript is a programming language that Website developers can use as a part of creating websites. In JavaScript, the way we do that is by using a library. JavaScript is not interpreted Java. Javascript (JS) is a scripting languages, primarily used on the Web. This post lists its use cases, points out  These primitives are used by the developer to explicitly allocate and free memory from and to the operating system. IMO if there's a non-JS language you use extensively, such as PHP, Ruby, Python, etc, the Jetbrains solution for that will have an overall edge. JavaScript is generally used within HTML documents (like web pages) rather than as standalone "apps" that run inside them. The <script> tag is used to define a client-side script ( JavaScript). To use a closure, simply define a function inside another function and expose it. actually used as tables, either contain non-string non-number keys  Oct 27, 2017 JavaScript, also known as JS, is used to make web applications more interactive, rather than being plain and static pages. JavaScript is a programming language commonly used in web development. What is Javascript in Selenium Webdriver and how to execute Javascript in Selenium Webdriver. In fact, for most  This is something of a simplistic view, and in this tutorial, I'm going to help you figure out exactly what is JavaScript used for. In addition to its use in web browser applications, Javascript is increasingly used in mobile applications, via cross-platform development tools like Titanium and PhoneGap, and in server-side code via frameworks like Node. what is javascript used for

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