Check Monotonic Array

Write a Python function `is_monotonic(arr)` that checks whether a given array is monotonic. An array is considered monotonic if it is either entirely non-increasing or non-decreasing.

#### Function Signature
```python [main.nopy]
def is_monotonic(arr: list) -> bool:
```

#### Input
- `arr`: A list of integers.

#### Output
- Returns `True` if the array is monotonic, otherwise `False`.

#### Examples
```python [main.nopy]
is_monotonic([6, 5, 4, 4])  # Output: True
is_monotonic([1, 2, 2, 3])  # Output: True
is_monotonic([1, 3, 2])     # Output: False
is_monotonic([1, 1, 1])     # Output: True
```

#### Constraints
- The input list can be empty or contain a single element, in which case it is considered monotonic.

def is_monotonic(arr):
    """
    Determine if the given array is monotonic.

    Args:
        arr (list): The input list of integers.

    Returns:
        bool: True if the array is monotonic, False otherwise.
    """
    # Placeholder for the solution
    pass

Press Shift+Enter or click Run to execute.

Intermediate lists functions

More challenges to try

Find Item with Maximum Frequency Extract Strings by Length Calculate Cylinder Surface Area Find First Digit Count True Booleans Divisible by Own Digits Count Positive Numbers Drop the first n elements from a sequence Find Minimum Tuple Value Count Number Occurrences