advance method
dynamic
advance()
Implementation
advance() {
head++;
try {
source.elementAt(head);
return true;
} on RangeError catch (e) {
eos = true;
return false;
}
}
advance() {
head++;
try {
source.elementAt(head);
return true;
} on RangeError catch (e) {
eos = true;
return false;
}
}