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32 lines
1.1 KiB
Markdown
32 lines
1.1 KiB
Markdown
# partition
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Splits an array into two groups based on a predicate function.
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This function takes an array and a predicate function. It returns a tuple of two arrays:
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the first array contains elements for which the predicate function returns true, and
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the second array contains elements for which the predicate function returns false.
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## Signature
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```typescript
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function partition<T>(arr: T[], isInTruthy: (value: T) => boolean): [truthy: T[], falsy: T[]];
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```
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### Parameters
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- `arr` (`T[]`): The array to partition.
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- `isInTruthy` (`(value: T) => boolean`): A predicate function that determines whether an element should be placed in the truthy array. The function is called with each element of the array.
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### Returns
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(`[T[], T[]]`): A tuple containing two arrays: the first array contains elements for which the predicate returned true, and the second array contains elements for which the predicate returned false.
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## Examples
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```typescript
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const array = [1, 2, 3, 4, 5];
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const isEven = x => x % 2 === 0;
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const [even, odd] = partition(array, isEven);
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// even will be [2, 4], and odd will be [1, 3, 5]
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```
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