{{alias}}()
    Returns an accumulator function which incrementally computes a range.

    If provided a value, the accumulator function returns an updated range. If
    not provided a value, the accumulator function returns the current range.

    If provided `NaN`, the range is `NaN` for all future invocations.

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

    Examples
    --------
    > var accumulator = {{alias}}();
    > var v = accumulator()
    null
    > v = accumulator( -2.0 )
    0.0
    > v = accumulator( 1.0 )
    3.0
    > v = accumulator( 3.0 )
    5.0
    > v = accumulator()
    5.0

    See Also
    --------