Delegated yield (yield star, yield *) in generator functions

by

Delegating to another generator means the current generator stops producing values by itself, instead yielding the values produced by another generator until it exhausts it. It then resumes producing its own values, if any.

For instance, if secondGenerator() produces numbers from 10 to 15, and firstGenerator() produces numbers from 1 to 5 but delegates to secondGenerator() after producing 2, then the values produced by firstGenerator() will be:

1, 2, 10, 11, 12, 13, 14, 15, 3, 4, 5


function* firstGenerator() {
    yield 1;
    yield 2;
    // Delegate to second generator
    yield* secondGenerator();
    yield 3;
    yield 4;
    yield 5;
}

function* secondGenerator() {
    yield 10;
    yield 11;
    yield 12;
    yield 13;
    yield 14;
    yield 15;
}

console.log(Array.from(firstGenerator()));

More Related Contents:

  1. When should I use a return statement in ES6 arrow functions
  2. ECMAScript 6 arrow function that returns an object
  3. One-liner to take some properties from object in ES 6
  4. “Uncaught SyntaxError: Cannot use import statement outside a module” when importing ECMAScript 6
  5. Using Node.js require vs. ES6 import/export
  6. Convert a string to a template string
  7. ES6 destructuring function parameter – naming root object
  8. What is the motivation for bringing Symbols to ES6?
  9. How to destructure into dynamically named variables in ES6?
  10. What is “function*” in JavaScript?
  11. ECMAScript 2015: const in for loops
  12. Create object from array
  13. How to generate range of numbers from 0 to n in ES2015 only?
  14. Error Duplicate Const Declaration in Switch Case Statement
  15. ES6 Dynamic class names
  16. ES6 array map doesn’t return anything: ReactJS
  17. Why React Hook useState uses const and not let
  18. ECMAScript 6 class destructor
  19. then() callback firing before promise is resolved in node.js [duplicate]
  20. ECMAScript 6: what is WeakSet for?
  21. Are HTMLCollection and NodeList iterables?
  22. How can I mock the imports of an ES6 module?
  23. spread operator vs array.concat()
  24. Replace element at specific position in an array without mutating it
  25. Promises, pass additional parameters to then chain
  26. String interpolation on variable
  27. Why should forEach be preferred over regular iterators?
  28. Re-export default in ES 6 modules
  29. gulp babel, exports is not defined
  30. Why will ES6 WeakMap’s not be enumerable?

Leave a Comment