[javascript] Local storage in Angular 2

Here is an example of a simple service, that uses localStorage to persist data:

import { Injectable } from '@angular/core';

@Injectable()
export class PersistanceService {
  constructor() {}

  set(key: string, data: any): void {
    try {
      localStorage.setItem(key, JSON.stringify(data));
    } catch (e) {
      console.error('Error saving to localStorage', e);
    }
  }

  get(key: string) {
    try {
      return JSON.parse(localStorage.getItem(key));
    } catch (e) {
      console.error('Error getting data from localStorage', e);
      return null;
    }
  }
}

To use this services, provide it in some module in your app like normal, for example in core module. Then use like this:

import { Injectable } from '@angular/core';

@Injectable()
export class SomeOtherService {

  constructor(private persister: PersistanceService) {}

  someMethod() {
    const myData = {foo: 'bar'};
    persister.set('SOME_KEY', myData);
  }

  someOtherMethod() {
    const myData = persister.get('SOME_KEY');
  }
}

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