• Introduction
• 1. Introduction to MobX
  • 1.1. Why MobX?
  • 1.2. The Gist of MobX
  • 1.3. Concepts & Principles
• 2. Core API
  • 2.1. observable
  • 2.2. @observable
  • 2.3. @computed
  • 2.4. autorun
  • 2.5. @observer
• 1. Advanced API
  • 3.1. autorunAsync
  • 3.2. createTransformer
  • 3.3. expr
  • 3.4. extendObservable
  • 3.5. fastArray
  • 3.6. isObservable(..)
  • 3.7. map
  • 3.8. modifiers
  • 3.9. observe
  • 3.10. tojson
  • 3.11. transaction
  • 3.12. untracked
  • 3.13. when
  • 3.14. extending mobx
  • 3.15. miscellaneous
• 1. Best Practices For Large Apps
  • 4.1. Defining data stores
  • 4.2. Writing (async) actions
  • 4.3. Organizing React components
• 1. How does MobX work?
  • 5.1. In depth explanation of MobX
• 1. Tips & Tricks
  • 6.1. DevTools
  • 6.2. ES5 / ES6 / TypeScript syntax
  • 6.3. Tracking state changes
  • 6.4. Performance considerations
• 7. Resources
• 8. Frequently Asked Questions
• Published with GitBook

MobX

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fastArray

Deprecated in 2.0, use observable(asFlat([])) instead

fastArray creates observable arrays, similar to observable([]) with two differences:

• The indices of arrays created by fastArray are not enumerable, so Object.keys(array) will always return an empty set.

This means that for .. in loops won't work on them (but normal for ;; loops will).

This reduces the overhead of adding new items to to an observable array significantly.

• Arrays created by using fastArray will apply the flat modifier by default; values added to the array will not be made reactive automatically.

fastArray will become the default behavior in the next major release. For more info on observable arrays, see: observable.