Reverse Array Up to Position

Write a Python function `reverse_array_upto_k(arr, k)` that takes a list `arr` and an integer `k` as input and returns a new list where the first `k` elements of the array are reversed, while the rest of the array remains unchanged.

#### Example Usage
```python [main.nopy]
reverse_array_upto_k([1, 2, 3, 4, 5, 6], 4)  # Output: [4, 3, 2, 1, 5, 6]
reverse_array_upto_k([4, 5, 6, 7], 2)       # Output: [5, 4, 6, 7]
reverse_array_upto_k([9, 8, 7, 6, 5], 3)    # Output: [7, 8, 9, 6, 5]
```

#### Constraints
- `k` will always be a positive integer.
- `k` will not exceed the length of the array.
- The input array will not be empty.
def reverse_array_upto_k(arr, k):
    """
    Reverse the first k elements of the array.

    Args:
        arr (list): The input list of elements.
        k (int): The number of elements to reverse from the start.

    Returns:
        list: A new list with the first k elements reversed.
    """
    # Placeholder for the solution
    pass
Intermediate listsfunctions
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