Dive Into Refactoring

Hi, my name is Alexander Shvets, I'm the creator of this website. After two years of work, I'm happy to present to you my course on refactoring, which will make you a better programmer. I have been programming since I was 13. Windows didn't even have a Start button back then. Since that time, I have worked at five companies, learned a half a dozen programming languages and launched several successful projects. In this course, I will share my knowledge with you and teach you to: - See the difference between beautiful and ugly code. - Improve ugly code, even where you thought it was impossible. - Change the code in such a way that it doesn't break other parts of your program. You will love the course if you have ever felt like this cat here (https://refactoring.guru/images/content-public/refactoring-cat.mp4) sitting in front of a broken build. BookmarkTitle:......Page 2 Copyright......Page 3 Preface......Page 5 Code Smells......Page 6 Bloaters......Page 7 Long Method......Page 9 Large Class......Page 13 Primitive Obsession......Page 16 Long Parameter List......Page 20 Data Clumps......Page 23 Object-Orientation Abusers......Page 26 Switch Statements......Page 27 Temporary Field......Page 30 Refused Bequest......Page 33 Alternative Classes with Different Interfaces......Page 36 Change Preventers......Page 39 Divergent Change......Page 40 Shotgun Surgery......Page 43 Parallel Inheritance Hierarchies......Page 46 Dispensables......Page 49 Comments......Page 51 Duplicate Code......Page 54 Lazy Class......Page 59 Data Class......Page 61 Dead Code......Page 64 Speculative Generality......Page 66 Couplers......Page 69 Feature Envy......Page 70 Inappropriate Intimacy......Page 73 Message Chains......Page 76 Middle Man......Page 79 Other Smells......Page 81 Incomplete Library Class......Page 82 Refactoring Techniques......Page 84 Composing Methods......Page 85 Extract Method......Page 88 Inline Method......Page 92 Extract Variable......Page 95 Inline Temp......Page 99 Replace Temp with Query......Page 101 Split Temporary Variable......Page 105 Remove Assignments to Parameters......Page 108 Replace Method with Method Object......Page 111 Substitute Algorithm......Page 115 Moving Features between Objects......Page 118 Move Method......Page 121 Move Field......Page 125 Extract Class......Page 128 Inline Class......Page 132 Hide Delegate......Page 135 Remove Middle Man......Page 139 Introduce Foreign Method......Page 142 Introduce Local Extension......Page 146 Organizing Data......Page 150 Self Encapsulate Field......Page 154 Replace Data Value with Object......Page 158 Change Value to Reference......Page 162 Change Reference to Value......Page 165 Replace Array with Object......Page 168 Duplicate Observed Data......Page 171 Change Unidirectional Association to Bidirectional......Page 176 Change Bidirectional Association to Unidirectional......Page 179 Replace Magic Number with Symbolic Constant......Page 183 Encapsulate Field......Page 187 Encapsulate Collection......Page 191 Replace Type Code with Class......Page 195 Replace Type Code with Subclasses......Page 200 Replace Type Code with State/Strategy......Page 205 Replace Subclass with Fields......Page 210 Simplifying Conditional Expressions......Page 214 Decompose Conditional......Page 217 Consolidate Conditional Expression......Page 220 Consolidate Duplicate Conditional Fragments......Page 223 Remove Control Flag......Page 226 Replace Nested Conditional with Guard Clauses......Page 228 Replace Conditional with Polymorphism......Page 232 Introduce Null Object......Page 237 Introduce Assertion......Page 241 Simplifying Method Calls......Page 244 Rename Method......Page 247 Add Parameter......Page 250 Remove Parameter......Page 253 Separate Query from Modifier......Page 256 Parameterize Method......Page 259 Replace Parameter with Explicit Methods......Page 262 Preserve Whole Object......Page 265 Replace Parameter with Method Call......Page 268 Introduce Parameter Object......Page 271 Remove Setting Method......Page 274 Hide Method......Page 276 Replace Constructor with Factory Method......Page 279 Replace Error Code with Exception......Page 283 Replace Exception with Test......Page 286 Dealing with Generalization......Page 289 Pull Up Field......Page 292 Pull Up Method......Page 295 Pull Up Constructor Body......Page 299 Push Down Method......Page 302 Push Down Field......Page 306 Extract Subclass......Page 309 Extract Superclass......Page 314 Extract Interface......Page 317 Collapse Hierarchy......Page 321 Form Template Method......Page 324 Replace Inheritance with Delegation......Page 328 Replace Delegation with Inheritance......Page 332 Afterword......Page 336