| # | title | topic | type | difficulty |
|---|---|---|---|---|
| 91 | The lazy singleton pattern | Patterns & Performance | Coding | Hard |
| 92 | Observer pattern with unsubscribe | Patterns & Performance | Coding | Medium |
| 93 | Prototype pattern: share the methods | Patterns & Performance | Coding | Medium |
| 94 | Mixin pattern: compose behaviors | Patterns & Performance | Coding | Medium |
| 95 | Fix the loop capture |
| Scope & Hoisting |
| Coding |
| Medium |
| 96 | Build the DOM's listener brain | DOM Events | Coding | Hard |
| 97 | Build makeStub | Testing Lifecycle | Coding | Easy |
| 98 | Build makeSpy | Testing Lifecycle | Coding | Medium |
| 99 | Build the lifecycle harness itself | Testing Lifecycle | Coding | Hard |