JavaScript Proxy, Reflect, Symbols, and property descriptors

Proxy, Reflect, and metaprogramming lessons

1. Symbol type

   Use Symbol values as unique property keys and understand symbol-based object protocols.

   Outcome: Avoid key collisions and recognize built-in protocols that rely on symbols.

   • JavaScript Symbol
   • symbol type
   • unique property keys
   Study Symbol type

2. Property descriptors

   Control writable, enumerable, and configurable property flags with Object.defineProperty.

   Outcome: Model object properties deliberately instead of relying only on assignment.

   • property descriptors
   • Object.defineProperty
   • property flags
   Study Property flags and descriptors

3. Getters and setters

   Create accessor properties that compute values, validate assignment, and keep public APIs stable.

   Outcome: Expose object APIs that behave like properties while running controlled logic.

   • JavaScript getters
   • JavaScript setters
   • accessor properties
   Study Property getters and setters

4. Private fields and encapsulation

   Use private fields and protected patterns to keep internal object state out of public access.

   Outcome: Protect internal state while keeping class APIs explicit.

   • JavaScript private fields
   • encapsulation
   • private properties
   Study Private and protected properties and methods

5. Proxy and Reflect

   Intercept object operations with Proxy traps and forward default behavior with Reflect methods.

   Outcome: Build wrappers for validation, logging, access control, and metaprogramming.

   • JavaScript Proxy
   • Reflect API
   • proxy traps
   Study Proxy and Reflect