How to remove duplicates from a list with lists in Dart / Flutter?
.toSet().toList() doesn't work.
For Example:
List one = [
[
[6, 51],
[2, 76]
],
[
[6, 51],
[2, 76]
],
[
[5, 66],
[4, 96]
]
]
Would be:
List two = [
[
[6, 51],
[2, 76]
],
[
[5, 66],
[4, 96]
]
]
I hope this works. Also import 'dart:convert';
List two =
one.map((f) => f.toString()).toSet().toList()
.map((f) => json.decode(f) as List<dynamic>).toList();
You can take advantage of properties of Set.
List two = one.toSet().toList();
Not incredibly efficient, but this could work
void main() {
List<List<List<int>>> one = [
[
[6, 51],
[2, 76]
],
[
[6, 51],
[2, 76]
],
[
[5, 66],
[4, 96]
]
];
print(one);
print(one.removeDuplicates());
}
extension ListExtension<T> on List<T> {
bool _containsElement(T e) {
for (T element in this) {
if (element.toString().compareTo(e.toString()) == 0) return true;
}
return false;
}
List<T> removeDuplicates() {
List<T> tempList = [];
this.forEach((element) {
if (!tempList._containsElement(element)) tempList.add(element);
});
return tempList;
}
}
