Free practice · multiple-choice · medium
Practice
Choose controlled collection changes
Which practices make collection updates safer to review? Select all that apply.
Collection contract
Choose access by the relationship the data represents
- List
- Ordered items accessed by index or iteration
- Dictionary
- Values accessed by stable keys
- Boundary
- Empty, one-item, and several-item states
- Mutation
- One deliberate, traceable change
- Reconciliation
- Expected size, keys, counts, and totals
Lists use ordered positions; dictionaries use meaningful keys. Both need shape, missing-data, mutation, and boundary checks.