33 lines
892 B
Markdown
33 lines
892 B
Markdown
---
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title: Repeat generator
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tags: function,generator
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expertise: advanced
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author: chalarangelo
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cover: blog_images/white-flower.jpg
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firstSeen: 2020-10-11T17:05:48+03:00
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lastUpdated: 2020-10-11T17:05:48+03:00
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---
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Creates a generator, repeating the given value indefinitely.
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- Use a non-terminating `while` loop, that will `yield` a value every time `Generator.prototype.next()` is called.
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- Use the return value of the `yield` statement to update the returned value if the passed value is not `undefined`.
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```js
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const repeatGenerator = function* (val) {
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let v = val;
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while (true) {
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let newV = yield v;
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if (newV !== undefined) v = newV;
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}
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};
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```
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```js
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const repeater = repeatGenerator(5);
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repeater.next(); // { value: 5, done: false }
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repeater.next(); // { value: 5, done: false }
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repeater.next(4); // { value: 4, done: false }
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repeater.next(); // { value: 4, done: false }
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```
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