georgesboris

Some sample code used for a creative coding workshop held at EBAC-SP on Sep 22, 2022.

georgesboris

//
// # Async Flutter Programming
//
// 1. Let's use our API class to fetch our users and list them.
// 2. Where should we trigger these requests?
// 3. Where should we store this state?
// 
// 4. Extra: Let's pretend "UserAvatar" is quite an expensive widget.
//    How would we refactor our code to make sure we don't re-build all "UserAvatar"s everytime
//    one of the user score changes?

georgesboris

import 'package:flutter/material.dart';

void main() {
  // where the magic happens
  Stack stack = Stack(title: "Magic ");
  print(stack._list);
  stack.push(1);
  stack.push(2);
  stack.push(3);
  print(stack._list);

georgesboris

class SingletonValueNoFactory {
  static SingletonValueNoFactory _instance;
  
  final dynamic value;
  
  SingletonValueNoFactory._internal(this.value);

  static SingletonValueNoFactory getInstance(value) {
    return _instance ??= SingletonValueNoFactory._internal(value);
  }

georgesboris

import { paths } from '../firebase-app'
import { FirebaseSync, firebaseSyncConnect } from '../firebase-sync'

const User = () => (
  <div>
    
    <FirebaseSync
      path={paths.user(props.userId)} />
    
    {user && (

georgesboris

const { applyAction } = require('../firebase-app');

// create our local database
let db = {};

// first user signs up and creates the first post
db = applyAction(createUser, createUserPayload, db);
db = applyAction(createPost, createPostPayload, db);
db = applyAction(updatePost, updatePostPayload, db);

georgesboris

require('firebase-app/rules')({
  rules: '/firebase-app/**/*.rules.js',
  filename: '/database.rules.json',
  actions: require('./actions/actions'),
  owners: require('./owners/owners'),
  paths: require('./paths/paths')
});

georgesboris

// first setup your mocha env as described on targaryen's docs.
// ...then:

const { paths, actions, getActionUpdates, applyAction } = require('../firebase-app');

describe('firebase-app userflow', () => {
  it('should be able to update post if is author', () => {
    
    const { updates } = getActionUpdates(updatePost, {
      post: 'post_1',

georgesboris

module.exports = {
  __setup__: 'actions',

  // notice we are defining the rules for a task with this ID.
  // this has nothing to do with paths. we may access this task payload as shown below.
  // here we're checking if the post we're updating was created by the authenticated user.
  updatePost: `newData.child('createdBy').val() == auth.uid`

};

georgesboris

module.exports = {
  __setup__: 'owners',

  // anyone can read our posts logs
  post: true

};