index_of()

Gets the index at which the first occurrence of value is found.

Implementation

Args: array: List to search. value: Value to search for. from_index: Index to search from. Returns: Index of found item or -1 if not found.

Example

index_of([1, 2, 3, 4], 2)

Expected output: 1

Alternative usage:

index_of([2, 1, 2, 3], 2, from_index=1)

Expected output: 2

Source Code

                        def index_of(array: List[T], value: T, from_index: int = 0) -> int:
    length = len(array)
    start = from_index if from_index >= 0 else max(length + from_index, 0)
    for i in builtins.range(start, length):
        if array[i] == value:
            return i
    return -1
                    