assertIndexes method
Implementation
void assertIndexes() {
if (ixFirst == null) ixFirst = 0;
if (ixLast == null) ixLast = array.length - 1;
if (ixLast <= ixFirst) {
ixLast = ixFirst + 1;
}
if (ixFirst < 0 || ixFirst > array.length - 1) ixFirst = 0;
if (ixLast > array.length - 1 || ixLast < 0) ixLast = array.length - 1;
}