xros

Future<int> sumStream(Stream<int> stream) async {
  int sum = 0;
  await for (var i in stream) {
    sum += i;
  }
  return sum;
}
 
Future<int> sumStream2(Stream<int> stream) =>
    stream.reduce((previous, element) => previous + element);

xros

// generics class (very re-usable)
class Stack<T>{
  final List<T> _items = [];
  
  void push(T item) {
    _items.add(item);
  }
  
  T pop() => _items.removeLast();
  

xros

// simple copyWith method 
class Credentials {
  const Credentials({this.email = '', this.password = ''});
  final String email;
  final String password;

  Credentials copyWith({String? email, String? password}) {
    return Credentials(
      email: email ?? this.email,
      password: password ?? this.password,

xros

// .fromJson , .toJson example in Dart
// .fromJson convert a Map Object to an Instance
// .toJson convert an Instance to a Map Object
class Person {
  Person({required this.name, required this.age});
  String name;
  int age;

  factory Person.fromJson(Map<String, Object> json) {
    final name = json['name'];

xros

import 'dart:io';
/*
 * An implementation of shopping cart and checkout in Dart
 *
 */

class Product {
  const Product({required this.id, required this.name, required this.price});
  final int id;
  final String name;

xros

class Person {
  const Person(this.name, this.age);
  final String name;
  final int age;

  factory Person.fromJson(Map<String, Object> json) {
    final name = json['name'];
    final age = json['age'];

    if (name == null) {

xros

import 'dart:math';
/*
We can use abstract classes to define an interface that can be implemented by subclasses

Very powerful: decouples code that uses an interface from its implementation

printArea() doesn't need to know that Sqaure and Circle even exist.

only needs a Shape argument with an area property
*/

xros

# retrieve webelement
input = driver.find_element_by_xpath("//*[@name='fieldname']")
# set attribute from js script referencing webelement found in python code
driver.execute_script("arguments[0].setAttribute('value', 'new value!')", input);
# or
driver.execute_script("arguments[0].setAttribute('value', arguments[1])", input, 'new value!');

# Code for File Upload
file_input = driver.find_element_by_id("uploadBtn")
file_input.send_keys("/absolute/path/to/file")

xros

-480p - Run tenfoot in 480p rather than 1080p
-720p - Run tenfoot in 720p rather than 1080p
-accountrecovery - Perform account recovery
-all_languages - show longest loc string from any language
-bigpicture - Start in Steam Big Picture mode
-cafeapplaunch - Launch apps in a cyber cafe context
-candidates - Show libjingle candidates for local connection as they are processed
-ccsyntax - Spew details about the localized strings we load
-community - Set the community URL
-complete_install_via_http - Run installation completion over HTTP by default

xros

server {
    listen  80;
    server_name  www.example.com;
    rewrite ^ http://example.com$request_uri? permanent; #301 redirect
}

server {
    listen  80;
    server_name  example.com;