{{alias}}( str, n )
    Returns the first `n` UTF-16 code units of a string.

    Parameters
    ----------
    str: string
        Input string.

    n: integer
        Number of UTF-16 code units to return.

    Returns
    -------
    out: string
        Output string.

    Examples
    --------
    > var out = {{alias}}( 'beep', 1 )
    'b'
    > out = {{alias}}( 'Boop', 1 )
    'B'
    > out = {{alias}}( 'foo bar', 5 )
    'foo b'

    See Also
    --------