Select the first elements of a tuple.

::tuple_first_n selects the first elements of Tuple and returns them with Selected. Thus Selected contains all elements of Tuple from the first element up to the ``n-th'' element of Tuple (including the ``n-th'' element). The index ``n'' is determined by the input parameter Index. Thus Index must contain a single integer value (if Index consists of a floating point number, this must represent an integer value without fraction). Indices of tuple elements start at 0, that means, the first tuple element has got the index 0.

::tuple_last_n, ::tuple_select, ::tuple_last_n, ::tuple_str_bit_select, ::tuple_concat

Operators not requiring licensing