{{alias}}( z )
    Returns the imaginary component of a double-precision complex floating-point
    number.

    Parameters
    ----------
    z: Complex128
        Complex number.

    Returns
    -------
    im: number
        Imaginary component.

    Examples
    --------
    > var z = new {{alias:@stdlib/complex/float64/ctor}}( 5.0, 3.0 );
    > var im = {{alias}}( z )
    3.0

    See Also
    --------