private String replace(String source, int start, int end, String replacement) {
AssertMe.rho_assert(start <= source.length() /* - 1*/);
if (end < start) {
end = start + 1;
}
StringBuffer result = new StringBuffer(source.substring(0, start));
result.append(replacement);
result.append(source.substring(end));
return result.toString();
}
// create a new Array containing every element from index to the end
public RubyValue collect(int index) {
AssertMe.rho_assert(index >= 0);
final int size = array_.size() - index;
if (size < 0) {
return new RubyArray();
}
RubyArray a = new RubyArray(size);
for (int i = index; i < array_.size(); ++i) {
a.add(array_.get(i));
}
return a;
}