Snippet

Bi-Directional State Delegation via Generator Yield Star Expressions

The yield* operator establishes full two-way communication channels to sub-generators, delegating .next() inputs directly into the nested iterator and capturing its final return expression value.

snippet.js

javascript

function* subProcess() {
  const received = yield 'READY';
  return `PROCESSED: ${received}`;
}
 
function* mainController() {
  const result = yield* subProcess();
  yield `FINAL: ${result}`;
}
 
const iterator = mainController();
console.log(iterator.next().value); // 'READY'
console.log(iterator.next('INPUT_DATA').value); // 'FINAL: PROCESSED: INPUT_DATA'

nodejs

Breakdown

function* subProcess()

Defines a sub-generator function capable of consuming external inputs via yield.

const result = yield* subProcess();

Delegates control flow to subProcess and assigns its eventual return value upon completion.

console.log(iterator.next('INPUT_DATA').value);

Passes a value through mainController into subProcess, advancing execution to the next yield.

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Bi-Directional State Delegation via Generator Yield Star Expressions

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