fdb

fdb.ts

// ($lt, $lte, $gt, $gte, $in, $nin, $ne, $exists, $regex)
// $or, $and, $not, $where
function extractValue(object: any) {
  const filterArray = [];
  for (const key in object) {
    filterArray.push(`${key};${object[key]}`);
  }
  const filterSort = filterArray.sort();
  return filterSort.toString();
}

export abstract class Collection<T> {
  constructor(name: string) {
    this.name = name;
  }
  private name!: string;
  private collection: T[] = [];

  create(item: T): Promise<boolean> {
    const before = this.collection.length;
    const after = this.collection.push(item);
    return Promise.resolve(before < after);
  }

  update(condition: any, item: T): Promise<T> {
    const filter = extractValue(condition);
    const [data] = this.collection
      .map((v, i) => {
        return { v, i };
      })
      .filter((data) => {
        return extractValue(data.v).includes(filter);
      });
    this.collection[data.i] = item;
    return Promise.resolve(this.collection[data.i]);
  }

  delete(condition: any): Promise<T[]> {
    const filter = extractValue(condition);
    const data = this.collection
      .map((v, i) => {
        return { v, i };
      })
      .filter((data) => {
        return extractValue(data.v).includes(filter);
      });

    data.forEach((item) => {
      this.collection.splice(item.i, 1);
    });
    return Promise.resolve(this.collection);
  }

  findOne(condition: any): Promise<T> {
    const filter = extractValue(condition);
    const [item] = this.collection.filter((v) => {
      return extractValue(v).includes(filter);
    });
    return Promise.resolve(item);
  }

  find(condition?: any): Promise<T[]> {
    const filter = extractValue(condition);
    const item = this.collection.filter((v) => {
      return extractValue(v).includes(filter);
    });
    return Promise.resolve(item);
  }
}

interface User {
  id?: string;
  name: string;
}

class UserCollection extends Collection<User> {}
const db = new UserCollection("user");

console.log('create', await db.create({ id: "0", name: "agus" }));
console.log('create', await db.create({ id: "1", name: "toni" }));
console.log('update',await db.update({ name: "agus", id : "0" }, { name: "budi", id: "0" }));
console.log('findOne',await db.findOne({ id: "0" }));
console.log('findAll',await db.find());
console.log('delete',await db.delete({ id: "0"}));
console.log('findAll',await db.find());