Hello World

JavaScript, often abbreviated as JS, is a programming language that is one of the core technologies of the World Wide Web, alongside HTML and CSS.

If you want to be a web developer, JavaScript is a must.

Let's start with a classic "Hello World".

console.log('Hello World!')

The console object provides access to the debugging console. And console.log() is used for general output of logging information.

Comments

Similar to C, JavaScript has 2 types of comments.

/*
 This is a block comment.
 */

// This is a line comment.

Comments are used to write programmers' notes that is to be ignored by the compiler or interpreter. As you see there, a line comment starts with double slashes //, and a block one is wrapped by /* ... */.

Template Literals

Template literals are literals delimited with backtick (`) characters, allowing for multi-line strings, string interpolation with embedded expressions.

let a = 10;
let b = 32;
console.log(`Hello, ${a+b}.`) // Hello, 42.

Code Challenge

Try to modify the code provided in the editor to make it print Hello, JavaScript! I'm doing web now!.