{{alias}}( str, len[, ending] )
    Truncates a string to a specified length.

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

    len: integer
        Output string length.

    ending: string (optional)
        Custom ending. Default: '...'.

    Returns
    -------
    out: string
        Truncated string.

    Examples
    --------
    > var str = 'beep boop';
    > var out = {{alias}}( str, 5 )
    'be...'

    > out = {{alias}}( str, 5, '|' )
    'beep|'

    See Also
    --------