filterNull<U> method
Implementation
Iterable<T> filterNull<U>([ TFuncMapper<T, U?>? funcMapper ]) {
Iterable<T> iter;
if (funcMapper == null) {
iter = this.where((x) => x != null);
}
else {
iter = this.where((x) => funcMapper(x) != null);
}
//return this.where((x) => x != null).map<T>((x) => x!);
return iter.map<T>((x) => x!);
}