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29 lines
844 B
Markdown
29 lines
844 B
Markdown
# xorBy
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Computes the symmetric difference between two arrays using a custom mapping function.
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The symmetric difference is the set of elements which are in either of the arrays,
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but not in their intersection, determined by the result of the mapping function.
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## Signature
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```typescript
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function xorBy<T, U>(arr1: T[], arr2: T[], mapper: (item: T) => U): T[];
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```
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### Parameters
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- `arr1` (`T[]`): The first array.
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- `arr2` (`T[]`): The second array.
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- `mapper` (`(item: T) => U`): The function to map array elements to comparison values.
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### Returns
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(`T[]`): An array containing the elements that are present in either `arr1` or `arr2` but not in both, based on the values returned by the mapping function.
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## Examples
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```typescript
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// Returns [{ id: 1 }, { id: 3 }]
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xorBy([{ id: 1 }, { id: 2 }], [{ id: 2 }, { id: 3 }], x => x.id);
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```
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