Show HN: Can you still read code? 155 JavaScript questions as a game

155 JavaScript questions that look easy and aren't. Use your brain, choose an answer, learn why.

function sayHi() { console.log(name); console.log(age); var name = 'Lydia'; let age = 21; }

sayHi();

ALydia and undefinedBLydia and ReferenceErrorCReferenceError and 21Dundefined and ReferenceError

Pick one. It counts as your answer in the game.

Know what the code does.

Agents write most of the code now, faster than anyone can review it. So we write less, read less, and slowly forget things we used to know.

Put the agent aside for a few minutes. Each question is a few lines of JavaScript with one right answer and a short explanation: a small workout for your memory and your mental model of the language.

The questions and explanations come from Lydia Hallie's javascript-questions (opens in a new tab), used under the MIT licence.

Feel free to add a question (opens in a new tab). The app is open source.