29 lines
841 B
Markdown
29 lines
841 B
Markdown
---
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title: Flat iterator
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tags: array,iterator,generator
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expertise: advanced
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author: chalarangelo
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cover: blog_images/balloons.jpg
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firstSeen: 2022-03-09T05:00:00-04:00
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---
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Creates a generator that iterates over an iterable, flattening nested iterables.
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- Use recursion.
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- Use a `for...of` loop to iterate over the values of the given iterable.
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- Use `Symbol.iterator` to check if each value is an iterable. If it is, use the `yield*` expression to recursively delegate to the same generator function. Otherwise, `yield` the current value.
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```js
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const flatIterator = function* (itr) {
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for (let item of itr) {
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if (item[Symbol.iterator]) yield* flatIterator(item);
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else yield item;
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}
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};
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```
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```js
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const arr = [1, 2, [3, 4], [5, [6, [7], 8]], 9, new Set([10, 11])];
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[...flatIterator(arr)]; // 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11
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```
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