Variables and the console

6 min 20 XP + 10 for no hints

A variable stores a value under a name. let creates one: let firstName = "Sam";. Text values, called strings, go inside quotes.

console.log() prints a value to the console, the developer's notepad. Join text with +: console.log("Hello, " + firstName);

JavaScript doesn't run as you type. Press Run (or Ctrl + Enter) and watch the Console tab.

Example

let city = "Lisbon";
let year = 2026;
console.log("I'm visiting " + city + " in " + year);

Names are case-sensitive: firstName and firstname are two different variables.

Your tasks

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What does console.log("2" + "2") print?

hello.jsPress Run or Ctrl + Enter

// Store your name in the variable
let firstName = "";

// Print a greeting that uses firstName

Press Run to see what your code prints.