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36 lines
904 B
Markdown
36 lines
904 B
Markdown
# flatten
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Flattens the nested array given as an argument to the desired depth.
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It works the same as [Array.prototype.flat](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/flat) provided by default in JavaScript and returns the same type. However, its performance is superior.
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## Signature
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```typescript
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function flatten<T, D extends number = 1>(arr: T[], depth?: D): Array<FlatArray<T[], D>>;
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```
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### Parameters
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- `arr` (`T[]`): The array to flatten.
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- `depth` (`D`): The depth to flatten, which defaults to 1.
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### Returns
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(`Array<FlatArray<T[], D>>`) A new array that has been flattened.
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## Examples
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```typescript
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const array = [1, [2, 3], [4, [5, 6]]];
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const result1 = flatten(array);
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// Return [1, 2, 3, 4, [5, 6]]
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const result2 = flatten(array, 1);
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// Return [1, 2, 3, 4, [5, 6]]
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const result3 = flatten(array, 2);
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// Return [1, 2, 3, 4, 5, 6]
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```
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