{{alias}}( value )
    Returns the data type of a complex number object.

    If provided an argument having an unknown or unsupported type, the function
    returns `null`.

    Parameters
    ----------
    value: any
        Input value.

    Returns
    -------
    out: string|null
        Data type.

    Examples
    --------
    > var v = new {{alias:@stdlib/complex/float64/ctor}}( 1.0, 2.0 );
    > var dt = {{alias}}( v )
    'complex128'
    > dt = {{alias}}( 'beep' )
    null

    See Also
    --------