簡易テーブル

JsonTable.js

class JsonTable {
  constructor(data = {}, isSafetyMode = true) {
    this.data = data;
    this.isSafetyMode = isSafetyMode;
  }
  insert(id, obj) {
    if(this.data[id]) {
      throw new Error(`IDがすでに存在する: ${id}`);
    }
    this.data[id] = this.copyIfNeeded(obj)
  }
  findById(id) {
    const result = this.data[id];
    return this.copyIfNeeded(result);
  }
  findAll() {
    return this.copyIfNeeded(Object.values(this.data))
  }
  copyIfNeeded(obj) {
    if(!this.isSafetyMode) {
      return obj;
    }
    return JSON.parse(JSON.stringify(obj))
  }
}