removeContexts method
Implementation
void removeContexts(int letRemain) {
if (_contexts.length > letRemain) {
_contexts = _contexts.skip(_contexts.length - letRemain).toSet();
}
}
void removeContexts(int letRemain) {
if (_contexts.length > letRemain) {
_contexts = _contexts.skip(_contexts.length - letRemain).toSet();
}
}