import { TObject } from "./dtypes";

export namespace dmarge {
  //Below is an example TypeScript function that takes two lists of objects and a key as input, and then merges the lists based on the value of the provided key.
  // Note that later fister item will be override by later items
  export function mergeListsByField(
    list1: TObject[],
    list2: TObject[],
    key: string
  ): TObject[] {
    const mergedList: TObject[] = [];
    const map: Map<any, TObject> = new Map();

    // Add objects from list1 to the map
    for (const obj of list1) {
      const keyValue = obj[key];
      map.set(keyValue, obj);
    }

    // Add objects from list2 to the map (overwrite if duplicate key)
    for (const obj of list2) {
      const keyValue = obj[key];
      map.set(keyValue, { ...map.get(keyValue), ...obj });
    }

    // Convert the map values back to a list
    mergedList.push(...map.values());

    return mergedList;
  }
}

// test
(() => {
  // dlog.obj(dmarge.mergeListsByField([{ key: 1, v: 'a' }, { key: 3, 'j': 2 }], [{ key: 1, 'j': 2 }, { key: 2, 'j': 2 }], 'key'))
})();