{{alias}}( arr, searchElement[, fromIndex] )
    Returns the first index at which a given element can be found.

    Search is performed using *strict equality* comparison.

    Parameters
    ----------
    arr: ArrayLike
        Array-like object.

    searchElement: any
        Element to find.

    fromIndex: integer (optional)
        Starting index (if negative, the start index is determined relative to
        last element).

    Returns
    -------
    out: integer
        Index or -1.

    Examples
    --------
    // Basic usage:
    > var arr = [ 4, 3, 2, 1 ];
    > var idx = {{alias}}( arr, 3 )
    1
    > arr = [ 4, 3, 2, 1 ];
    > idx = {{alias}}( arr, 5 )
    -1

    // Using a `fromIndex`:
    > arr = [ 1, 2, 3, 4, 5, 2, 6 ];
    > idx = {{alias}}( arr, 2, 3 )
    5

    // `fromIndex` which exceeds `array` length:
    > arr = [ 1, 2, 3, 4, 2, 5 ];
    > idx = {{alias}}( arr, 2, 10 )
    -1

    // Negative `fromIndex`:
    > arr = [ 1, 2, 3, 4, 5, 2, 6, 2 ];
    > idx = {{alias}}( arr, 2, -4 )
    5
    > idx = {{alias}}( arr, 2, -1 )
    7

    // Negative `fromIndex` exceeding input `array` length:
    > arr = [ 1, 2, 3, 4, 5, 2, 6 ];
    > idx = {{alias}}( arr, 2, -10 )
    1

    // Array-like objects:
    > var str = 'bebop';
    > idx = {{alias}}( str, 'o' )
    3

    See Also
    --------