Understanding ECMAScript 6 by Nicholas C. Zakas

Author:Nicholas C. Zakas
Language: eng
Format: epub, mobi
Published: 2016-10-06T09:28:44+00:00

Delegating Generators

In some cases, combining the values from two iterators into one is useful. Generators can delegate to other generators using a special form of yield with a star (*) character. As with generator definitions, where the star appears doesn’t matter, as long as the star falls between the yield keyword and the generator function name. Here’s an example:

function *createNumberIterator() { yield 1; yield 2; } function *createColorIterator() { yield "red"; yield "green"; } function *createCombinedIterator() { yield *createNumberIterator(); yield *createColorIterator(); yield true; } var iterator = createCombinedIterator(); console.log(iterator.next()); // "{ value: 1, done: false }" console.log(iterator.next()); // "{ value: 2, done: false }" console.log(iterator.next()); // "{ value: "red", done: false }" console.log(iterator.next()); // "{ value: "green", done: false }" console.log(iterator.next()); // "{ value: true, done: false }" console.log(iterator.next()); // "{ value: undefined, done: true }"

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