function composition core interview pattern Pattern
Pattern hubs are for building transferable solving frames. Learn the recognition signals first, then drill state definition, update rules, and edge explanation until the pattern feels stable.
Pattern brief
Recognize first
Look for correct right-to-left application of functions.
Solve rhythm
State the active state and invariant first, explain how each update preserves them, then pressure-test with counterexamples.
Most common miss
Applying functions from left to right instead of right to left.
Recognition signals
- Look for correct right-to-left application of functions.
- Check if the candidate handles empty arrays as identity functions.
Solve flow
- 1. Define the active state/window.
- 2. Update state while preserving invariants.
- 3. Validate with edge-heavy examples.
Common misses
- Applying functions from left to right instead of right to left.
Recommended Ladder
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