Programming Fundamentals/Introduction Examples JavaScript

Overview JavaScript, often abbreviated as JS, is a high-level, interpreted programming language. Alongside HTML and CSS, JavaScript is one of the three core technologies of the World Wide Web. JavaScript enables interactive web pages and therefore 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.Wikipedia: JavaScript JavaScript is one of the most popular current programming languagesTIOBE: Index, and is the primary programming language for front-end web development. JavaScript files have a .js file extension. JavaScript has been implemented in multiple platforms with different I/O commands. Several examples follow. Example Hello World – Console Log // This script displays "Hello world!". // // References: // https://www.digitalocean.com/community/tutorials/how-to-write-your-first-javascript-program console.log("Hello world!") Output Hello world! Discussion Each code element represents: // begins a comment console.log() writes to the JavaScript console output log "Hello world!" is the literal string to be displayed Hello World – Window Alert // This script displays "Hello world!". // // References: // https://www.digitalocean.com/community/tutorials/how-to-write-your-first-javascript-program alert("Hello world!") Output Hello world! Discussion Each code element represents: // begins a comment alert() calls the window alert function to display a message "Hello world!" is the literal string to be displayed Hello World – Document Write // This script displays "Hello world!". // // References: // https://www.w3schools.com/jsref/met_doc_write.asp document.write("Hello world!") Output Hello world! Discussion Each code element represents: // begins a comment document.write() writes output to the current document "Hello world!" is the literal string to be displayed JavaScript IDEs There are many free cloud-based and local IDEs available to begin coding in JavaScript. Check with your instructor or do your own research for recommendations. Cloud-Based IDEs Chapman.edu: Online JavaScript Interpreter CodeChef GDB Online Ideone paiza.IO PythonTutor repl.it Local IDEs Wikipedia: Brackets (text editor) Wikipedia: Visual Studio Code References Wikiversity: Computer Programming