insert..Root.String.insertInserts a copy of the sequence of characters in the range [first, last) before element pointed by w.
Parameters: StringIterator w, StringIterator first, StringIterator last
Return value: reference to this String
NativeCallable, Callable
auto a.=("----");
auto b.=("||");
a.insert(a.begin().+(2), b.begin(), b.end());
log(a);
--||--