6 Safe Refactorings for Untested Legacy Code
summary
Six concrete refactorings (inline, rename, extract, change-signature, distill/extract, extend/override) are demonstrated with TypeScript examples and VS Code shortcuts to safely change untested legacy code. Each move follows the pattern create new code, replace occurrences, remove old so edits never leave the repository broken; tools include TypeScript types and an extension for automated refactors; use F2 and extract/inline shortcuts to compose safe multi-step changes and expose pure logic for unit tests.
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chapters (12)
- 0:00Introduction to refactoring
- 1:02What is refactoring
- 4:59Legacy code challenges
- 6:25Core refactorings overview
- 7:30Inline refactoring
- 10:21Rename refactoring
- 14:55Extract refactoring
- 20:59Composing refactorings
- 21:21Change signature refactoring
- 25:35Distill and extract for testing
- 32:25Extend and override technique
- 40:09Summary and resources
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