// MISSION ARCHIVE //

CHALLENGE HALL

Select an anomaly, inspect the buggy logic, and submit your verified fix.

INSANE

+1000 XP

EventEmitter Listener Removal Splice Bug

A custom EventBus implementation uses array.indexOf followed by splice inside a loop. When a listener unregisters itself during event dispatch, subsequent listeners in the array are skipped! Fix the dispatch array traversal.

⏱ 20m limit ⚡ 0 Solves JAVASCRIPT

HUNT BUG →

INSANE

+1000 XP

Circular Reference JSON Sanitizer

A payload logger crashes with 'TypeError: Converting circular structure to JSON'. Implement a custom JSON stringifier replacer function that replaces circular node references with '[Circular]'.

⏱ 20m limit ⚡ 0 Solves JAVASCRIPT

HUNT BUG →

INSANE

+1000 XP

Currying Function Arity Pipeline

A functional programming curry utility stops accumulating arguments too early when empty calls occur. Build a robust curry function that continuously returns a curried function until fn.length arguments have been received.

⏱ 20m limit ⚡ 0 Solves JAVASCRIPT

HUNT BUG →

INSANE

+1000 XP

Immutable State Tree Reducer Mutation

A gaming state manager reducer performs deep updates by modifying properties directly on the existing state tree. In an immutable architecture, this breaks state time-travel. Refactor to return a clean new state object with updated branch values.

⏱ 20m limit ⚡ 0 Solves JAVASCRIPT

HUNT BUG →