Function tap

tap<T>(callback): OperationFunction<T, T>
Invokes a callback for each element in the source.
Type Parameters
- T
  Type of items in the source.
Parameters
- callback: CallbackFunction<T>
  Callback function to invoke for each element.
Returns OperationFunction<T, T>
Operation that invokes a callback for each element in the source.
Example
```
const result = tap<number>((x) => console.log(x))([1, 2, 3]);
// Logs:
// 1
// 2
// 3
console.log([...result]); // [1, 2, 3]
```
- Defined in operations/tap/tap.ts:37