https://github.com/appsup-dart/firebase_compute

https://github.com/appsup-dart/firebase_compute

dart firebase reactive-programming

Last synced: 3 months ago
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• Host: GitHub
• URL: https://github.com/appsup-dart/firebase_compute
• Owner: appsup-dart
• License: bsd-3-clause
• Created: 2017-03-07T13:22:36.000Z (over 8 years ago)
• Default Branch: master
• Last Pushed: 2017-12-11T16:08:14.000Z (over 7 years ago)
• Last Synced: 2025-01-30T01:14:32.693Z (5 months ago)
• Topics: dart, firebase, reactive-programming
• Language: Dart
• Size: 11.7 KB
• Stars: 2
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE

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README

        
# firebase_compute

[![Build Status](https://travis-ci.org/appsup-dart/firebase_compute.svg?branch=master)](https://travis-ci.org/appsup-dart/firebase_compute)

Library for doing reactive computations with firebase.

## Usage

A simple, yet powerful usage example!

Given a Firebase instance containing events in a calendar, the following code will print the next appointment.

    import 'package:firebase_compute/firebase_compute.dart';

    import 'package:firebase_dart/firebase_dart.dart';

    import 'dart:async';

    

    main() async {

      var ref = new Firebase("https://my-project.firebaseio.com");

    

      var data = new DynamicReference(ref); // create a reactive version of a firebase reference

    

      data

          .child("calendar").child("events")    // reference the subtree at /calendar/events

          .orderByChild("startTime").limitToFirst(1) // order by child startTime and limit to first result

          .startAt(new ReactiveDateTime.now().toIso8601String())  // start at the current time

          .firstChild() // move to the first child

          .val()

          .asStream().forEach((v)=>print("your next appointment is at ${v["startTime"]}: ${v["description"]}"));

    

      ref.child("calendar").child("events").push({

        "startTime": new DateTime.now().add(new Duration(hours: 4)).toIso8601String(),

        "description": "hairdresser"

      });  // will print "your next appointment is at ... : hairdresser"

    

      await new Future.delayed(new Duration(seconds: 2));

    

      ref.child("calendar").child("events").push({

        "startTime": new DateTime.now().add(new Duration(seconds: 10)).toIso8601String(),

        "description": "doctor"

      });  // will print "your next appointment is at ... : doctor"

    

      // after 10 seconds will print "your next appointment is at ... : hairdresser"

    

    

    

    }

## Features and bugs

Please file feature requests and bugs at the [issue tracker][tracker].

[tracker]: https://github.com/appsup-dart/firebase_compute/issues