A basic localStorage ORM

localStore.js

class LocalStore {
  constructor(storeName) {
    this.storeName = storeName;
    localStorage[storeName] = JSON.stringify([]);
  }

  getAll() {
    return JSON.parse(
      localStorage[this.storeName]
    );
  }

  setAll(mutatedStore) {
    localStorage[this.storeName] = JSON.stringify(mutatedStore);
  }

  getItemByIndex(index) {
    let storeObject = this.getAll();
    return storeObject[index];
  }

  setItemByIndex(index, mutatedItem) {
    let storeObject = this.getAll();
    let mutatedStoreObject = storeObject;
    mutatedStoreObject[index] = mutatedItem;
    this.setAll(mutatedStoreObject);
  }

  getItemsByProperty(propertyKey, matchingValue) {
    let storeObject = this.getAll();
    let results = storeObject.filter(item => {
      return item[propertyKey] === matchingValue;
    });
    return results;
  }

  setItemByProperty(propertyKey, matchingValue, modifiedItem) {
    let storeObject = this.getAll();
    let indexOfitemToModify = storeObject.findIndex(item => {
      return item[propertyKey] == matchingValue;
    });
    storeObject[indexOfitemToModify] = modifiedItem;
    this.setAll(storeObject);
  }

  addItem(item) {
    let storeObject = this.getAll();
    storeObject.push(item);
    this.setAll(storeObject);
  }

  removeItem(item) {
    let storeObject = this.getAll();
    storeObject.splice(
      storeObject.indexOf(item),
      1
    );
    this.setAll(storeObject);
  }

  delete() {
    localStorage.removeItem(this.storeName);
  }

  reset() {
    localStorage[this.storeName] = JSON.stringify([]);
  }
}