isekai_wiki_app/lib/extension/map.dart

import 'package:get/get.dart';

extension MapExtension<K, T> on Map<K, T> {
  T getWithSetCallback(K key, T Function() callback) {
    if (containsKey(key)) {
      return this[key]!;
    } else {
      var data = callback();
      this[key] = data;
      return data;
    }
  }
}

extension RxMapExtension<K, T> on RxMap<K, T> {
  T getWithSetCallback(K key, T Function() callback) {
    if (containsKey(key)) {
      return this[key]!;
    } else {
      var data = callback();
      this[key] = data;
      return data;
    }
  }
}