list_ext.dart

import 'package:test/test.dart';

extension ListExt<T> on List<T> {
  
  /// Remove an object from
  operator -(T other) async {
    this.remove(other);
    return this;
  }
  
  /// Remove all objects in array
  operator ~/(List<T> other) {
    other.forEach((e) => this.remove(e));
    return this;
  }
  
  bool all(bool Function(T) varificator) {
    for(T data in this) {
      if (!varificator.call(data)) return false;
    }
    return true;
  }
}

void main() {
  test("Test minus operator", () {
    List<String> data = ["A" , "B", "C", "D"];
    var newlist = data - "A";
    assert(!newlist.contains("A"));
  });
  
  test("Test Remove all object", () {
    List<String> data = ["A" , "B", "C", "D"];
    var newlist = data ~/ ["A", "B"];
    assert(!newlist.contains("A"));
    assert(!newlist.contains("B"));
  });
  
  test("Test all method", (){
    List<String> data = ["A" , "B", "C", "D"];
    var allSingleChar = data.all((e) => e.length == 1);
    assert(allSingleChar);
  });
}