Deshaun  Olson

Deshaun Olson

1594054680

F# Fabulous - Beyond MVU Basics | The Xamarin Show

This week, James is joined once again with designer and architect of F# Don Syme and Fabulous maintainer Timothé Larivière. They are back to talk more in-depth about building Xamarin mobile apps with F# and Fabulous. This approach combines functional programming and MVU style of development create a lovely environment for build apps.

Time Codes:
00:00 Recap of Fabulous

03:00 Fabulous + ML from Faisal Waris

05:40 Architect of a Fabulous App

15:30 Contact App Walkthrough

25:00 Custom Controls and Styling

#xamarin

What is GEEK

Buddha Community

F# Fabulous - Beyond MVU Basics | The Xamarin Show
Lia  Haley

Lia Haley

1589715360

Introduction to Fabulous a F# MVU Framework for Xamarin | The Xamarin Show

This week, James is joined by friends of the show by the designer and architect of F# Don Syme and Microsoft MVP and Fabulous maintainer Timothé Larivière. They are here to show off how F# and Fabulous create an awesome way to build cross-platform apps with Xamarin. Leveraging functional programming and MVU style of development create a lovely environment for build apps. Tune in for a full crash course!

Subscribe channel now: Xamarin Developers - https://www.youtube.com/watch?v=TX959tx72qo

#xamarin #fabulous #mvu #fsharp

Gaurav Singh

1609755091

Xamarin Forms Training Institute | Xamarin Forms Development Classes | Xamarin Training

In this Xamarin Online course, you will learn each and every topic with the help of hands-on labs. This program includes a hands-on live project with the implementation of recommended design patterns and practices. The learning path for this program is given below:
Xamarin Training objective
At the completion of this course, attendees will be able to;

  1. Understand Xamarin architecture
  2. Understand Xamarin .Android, Xamarin. iOS fundamentals
  3. Understand Xamarin. Forms fundamentals
  4. Build UI with XAML and code
  5. Work with images, display data beautifully and create interactive lists
  6. Implement multi-page apps with navigation, tabs, master/detail pages
  7. Store and retrieve data from a variety of sources like file system, SQLite database and RESTful services
  8. Implement MVVM pattern

#xamarin training #xamarin course #xamarin forms course #xamarin online course #xamarin forms training #xamarin training course

Deshaun  Olson

Deshaun Olson

1594054680

F# Fabulous - Beyond MVU Basics | The Xamarin Show

This week, James is joined once again with designer and architect of F# Don Syme and Fabulous maintainer Timothé Larivière. They are back to talk more in-depth about building Xamarin mobile apps with F# and Fabulous. This approach combines functional programming and MVU style of development create a lovely environment for build apps.

Time Codes:
00:00 Recap of Fabulous

03:00 Fabulous + ML from Faisal Waris

05:40 Architect of a Fabulous App

15:30 Contact App Walkthrough

25:00 Custom Controls and Styling

#xamarin

How to Design Login Page using Xamarin Forms C# | Login Form | Sign In UI Design

#xamarin
#aspdotnetexplorer
https://www.youtube.com/watch?v=2tehSdX897E

#xamarin forms #xamarin forms bangla tutorials for beginners #xamarin forms tutorials for beginners #xamarin #xamarin.forms #xamarin.forms ui

Cayla  Erdman

Cayla Erdman

1599907200

Fabulous: Functional App Development | Xamarin Blog

his is a guest blog by Timothé Larivière. Timothé is the maintainer of Fabulous and a Microsoft MVP. You can find him on Twitter @Tim_Lariviere.

Fabulous App Development

Fabulous is an open-source framework for building mobile & desktop apps using functional programming (FP) with F#, a .NET functional-first programming language. It is available on GitHub at https://github.com/fsprojects/Fabulous.

Applications built with Fabulous use the MVU design pattern (Model-View-Update, also known from the origin The Elm Architecture). These app also use declarative views written directly in F#.

This may already feel familiar to you if you have played with frameworks like React-Redux, Flutter, or SwiftUI.

Object-oriented programming (OOP) is widely used today. However, in this post, we will elaborate on how FP can also be an awesome tool for building apps.

_A few apps made with Fabulous for Xamarin.Forms, from left to right: FabulousWeatherFabulousContacts and _FabulousPlanets

Image FabulousWeatherImage FabulousContacts

Fundamentals of MVU

Note: We will see MVU as defined by Elm, which is the definition used by many F## libraries.

The upcoming MAUI will integrate a different variant of it.

Before diving in, let’s expand on what the MVU pattern is and how it differs from more traditional MVVM apps.

Image of MVU

Credits: Beginning Elm (https://elmprogramming.com)

The idea is to have a state (also called Model) that is immutable and can only be changed through messages (Msg) that are processed by the update function. Those messages are then sent when users interact with the application or when external factors happen. Such as async request completes, push notifications, and switching between dark and light modes. Each time the state is updated, Fabulous will ask for the matching UI state and will transition between them transparently.

MVU provides several advantages over MVVM:

  • Immutable state

In MVVM, the ViewModel (which holds the state) is mutable and is usually changed in multiple methods in reaction to what happens. When the app grows bigger, make extra effort and be careful when adding new changes to not break existing behaviors unknowingly. In MVU, the immutability of the app state ensures that it won’t ever be changed outside of the dedicated update function, without a dedicated message. This makes it very simple to add new features without worrying about breaking something.

  • Centralization & explicitness
  • The structure of MVU is really simple and enforces explicitness.
  • The state can only be initialized in the init function and changed in the update function only for declared Msgs, the UI can only be declared in the view function.
  • This makes it really easy to welcome new developers to the codebase and makes debugging a lot easier.
  • If it breaks, there’s only one place.
  • No concurrency issues
  • The user navigates, data gets loaded, animations end, … Reacting to one event is easy, but when you need to handle multiple events at the same time, it becomes tricky.
  • This can lead to obscur errors, very hard to understand and sometimes impossible to reproduce.
  • Fabulous helps you avoid this kind of problem by applying concurrent messages one after the other.
  • Also, Fabulous lets you monitor its MVU loop so you can know what happened in which order.
  • Easy to replay that one corner case!
  • Ease of testing
  • A best practice in FP is to write functions that only depend on their parameters and not on the global context, much like static methods.
  • Those functions are called pure and are really easy to test, for the same parameters you’ll always get the exact same output.
  • With MVU, the initupdate and view functions are pure by default. Meaning you can unit test them super easily, including your UI!
  • You can see an example here.

#developers #xamarin.forms #app development #f# #fabulous #mobile applications #mobile apps #mvu