Conditional and Data Restructuring Clinic

Attempt these tasks before opening feedback. Preserve initial predictions, diffs, commands, actual results and assistance. Reuse valid lab evidence; extra lesson drills are repair or optional depth.

P11: Consolidate lazily

Implement eligible using a lazy combined predicate. Compare with constructing a list of predicate results first.

P12: Choose a dispatch boundary

Compare a hierarchy, function table and closed match for a stable variant set receiving frequent new operations.

P13: Specify a parameter object

Define DateRange endpoint, time representation and alias rules. Separate added validation from structural wrapping.

P14: Move with a facade

Move a calculation behind a new module boundary while an external caller uses the old import. State removal criteria.

P15: Budget a refactor

Choose a small observed problem, a candidate move, a keep alternative and a stop condition.

Use the behavior contracts and offline labs. For a named gap, consult the Refactoring book index and module reading guide.