Function union

union<T, P>(arr: T, array: P): [...T, ...P]
Returns every element that exists in any of the two arrays once

Example
```
union([1, 2, 3], [4, 3, 2]); // [1,2,3,4]
```
Type Parameters
- T extends unknown[]
- P extends unknown[]
Parameters
- arr: T
- array: P
Returns [...T, ...P]
- Defined in array/union/index.ts:8

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