Hello World

console.log('Hello World!'); // Output: Hello World!

Let’s break this down:

1. console.log(): console is a global object provided by JavaScript environments such as web browsers or Node.js. The log method is a function on the console object that is used to print output. This output is typically sent to the standard output (stdout) which in a web browser is the JavaScript console.
2. 'Hello World!': This is a string literal, which is a series of characters surrounded by single quotes (') or double quotes ("). In this case, the string literal contains the text Hello World!.
3. console.log('Hello World!'): When this statement is executed, it will send the string Hello World! to the standard output. If this is a web browser, it would typically appear in the JavaScript console.
4. // Output: Hello World!: This is a comment in the code. In JavaScript and TypeScript, any text following // on a line is a comment, and it does not affect the execution of the code. It is used here to indicate the expected output of the console.log statement.

So, in summary:

• console.log('Hello World!'); is a line of TypeScript/JavaScript code that outputs the string 'Hello World!' to the console.
• // Output: Hello World! is a comment that documents the expected output of the previous line of code.