ML SystemPart 1: Core ConceptsChapter 4
CH.04 ~20 min
Modern JS
ES15, Immutability, and Arrow Functions.
ES15ImmutabilityFunctional
- Apply ES15 features in React development.
- Implement immutability patterns for state management.
- Use higher-order array methods to transform UI data.
01 JavaScript Standards & Immutability Viz
Definition
Immutability
The principle that data structures should not be modified directly. Instead, new copies with the desired changes are created.
| Feature | Description |
|---|---|
| const vs let | Prefer const for all references; use let only when reassignment is strictly necessary. |
| Arrow Functions | Compact syntax that inherits 'this' from the lexical scope. |
| Destructuring | Extracting properties from objects or arrays directly into variables. |
02 High-Order Transformations
Avoid Direct Mutations
Directly modifying a state object (e.g., clicks.left = 1) will fail to trigger a re-render because React's shallow comparison won't detect the change.
Key Takeaways
- 1Use 'const' by default to ensure reference stability.
- 2Never mutate state directly; always create a new copy.
- 3Higher-order functions are essential for rendering lists and filtering data in React.
CH.04
Chapter Complete
Chapter Progress
Reading
Exercise
Interact with the visualization
Quiz
System Efficiency Quiz
Test your understanding of caching, message queues, and communication protocols.
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