JavaScript generators, async iterators, and for await...of

Generator and async iterator lessons

1. Iterable protocol foundation

   Review Symbol.iterator, iterator objects, next(), done, value, and for..of before using generators.

   Outcome: Understand the protocol that generator objects implement.

   • JavaScript iterables
   • Symbol.iterator
   • iterator protocol
   Study Iterables

2. Generator functions

   Create generator functions with function*, pause execution with yield, and consume generated values.

   Outcome: Generate values lazily without building intermediate arrays.

   • JavaScript generators
   • generator function
   • function star JavaScript
   Study Generators

3. Yield and generator control

   Pass values into generators with next(value), delegate with yield*, and stop or throw into a generator.

   Outcome: Control two-way communication between caller code and generator code.

   • yield JavaScript
   • yield star
   • generator next throw return
   Study Generators

4. Async iterators

   Implement Symbol.asyncIterator and consume asynchronous values with for await...of loops.

   Outcome: Process asynchronous data sources one value at a time.

   • async iterators
   • Symbol.asyncIterator
   • for await of
   Study Async iteration and generators

5. Async generators

   Use async function* with await and yield to model paginated data, streams, and delayed sequences.

   Outcome: Build stream-style asynchronous APIs with clear iteration syntax.

   • async generators
   • async function star
   • JavaScript streams
   Study Async iteration and generators