What format are answers?

JSON form: strings use double quotes, arrays/objects keep JSON structure, undefined is shown explicitly.

What level is it for?

Anyone who knows variables, arrays and objects; it moves from arithmetic to map/filter/reduce.

Where is progress stored?

Only in local localStorage, never uploaded; full backup/restore is available.

LEARNING GAME

JavaScript Output: 1000 Gamified Expression and Array Cards

Turn JS output into cards: read an expression or array method, predict the result mentally, then reveal; 20 cards per level. It covers map/filter/reduce, slice/sort, objects/JSON and logic.

0Due today

0New cards

0Day streak

0Lv.1 · 0/100

Progress is stored locally in localStorage and is lost if you clear storage. Reviews use 1/3/7/14/30/60/120-day intervals.