Original browser-local quiz

Guess the programming language.

Read the code, choose a language, then inspect the tell. Recognition is not mastery, so every answer explains the intended clue.

Language ID

No timer. No account. No leaderboard. The score stays in this page and disappears when you leave.

Question 01 / 08Read the code. Find the tell.

Score 00 / 08

Code.sampleUTF-8

fn double(items: &[i32]) -> Vec<i32> {
    items.iter().map(|n| n * 2).collect()
}

Choose the languageOne answer

Select one answer. The explanation appears here.

What it measures

Recognition, not mastery.

Each sample contains at least one intended language-specific clue. Real code can still be ambiguous. The explanation makes the answer key visible so you can challenge the question instead of trusting a hidden score.

Every sample and explanation was written from scratch for the current project. This is not a copy or restoration of the former site's quiz.