{{alias}}( [out,] W )
    Returns an accumulator function which incrementally computes a moving
    minimum and maximum.

    The `W` parameter defines the number of values over which to compute the
    moving minimum and maximum.

    If provided a value, the accumulator function returns an updated moving
    minimum and maximum. If not provided a value, the accumulator function
    returns the current moving minimum and maximum.

    As `W` values are needed to fill the window buffer, the first `W-1` returned
    minimum and maximum values are calculated from smaller sample sizes. Until
    the window is full, each returned minimum and maximum is calculated from all
    provided values.

    Parameters
    ----------
    out: Array|TypedArray (optional)
        Output array.

    W: integer
        Window size.

    Returns
    -------
    acc: Function
        Accumulator function.

    Examples
    --------
    > var accumulator = {{alias}}( 3 );
    > var mm = accumulator()
    null
    > mm = accumulator( 2.0 )
    [ 2.0, 2.0 ]
    > mm = accumulator( -5.0 )
    [ -5.0, 2.0 ]
    > mm = accumulator( 3.0 )
    [ -5.0, 3.0 ]
    > mm = accumulator( 5.0 )
    [ -5.0, 5.0 ]
    > mm = accumulator()
    [ -5.0, 5.0 ]

    See Also
    --------