cylindrical-lantern-6201

readme.md

cylindrical-lantern-6201

Created with <3 with dartpad.dev.

main.dart

void main() {
  print(add << null << 1);
  print(add << 1 << null);
  print(add << 1 << 2);
}

int add(int a, int b) => a + b;

extension IfNotNull<R, T extends Object> on R Function(T)? {
  R? operator <<(T? input) {
    var self = this;
    if (self == null || input == null) return null;
    return self(input);
  }
}

extension IfNotNull2<R, S extends Object, T extends Object> on R Function(S, T)? {
  R? Function(T)? operator <<(S? input) {
    var self = this;
    if (self == null || input == null) return null;

    return (T next) => self(input, next);
  }
}