Deact: A Web UI Framework inspired By React

Deact

A web UI framework inspired by React. An UI is built of components and components are built of DOM elements. Components can be stateless or stateful.

Getting started

The entrypoint of a Deact application is the deact() function. It requires a selector string and a function, that returns the root node of the application. The selector string is used to query a host element from the DOM.

All elements beneath the host element will be deleted and replaced by the provided root node.

A node can be a DOM element, a text or a component.

import 'package:deact/deact.dart';
import 'package:deact/deact_html52.dart';

void main() {
  deact(
    '#root',
    div(children: [txt('Hello World')]),
  );
}

In the example above, a div element with the text Hello World is added beneath the DOM element with the id root.

Components

If an application becomes more complex, it is advisable to separate the UI into smaller reusable chunks. Here, components come into play. A component is a function that returns a node. As a normal Dart function, a component can have parameters to configure the component.

import 'package:deact/deact.dart';
import 'package:deact/deact_html52.dart';

void main() {
  deact(
      '#root',
      fragment([
        coloredText('I am blue.', 'blue'),
        coloredText('I am red.', 'red'),
      ]));
}

DeactNode coloredText(String text, String color) => fc((_) {
      return div(style: 'color: $color', children: [txt(text)]);
    });

In this example a component with the name coloredText is introduced. The name itself is irrelevant for Deact and just helps to give the component a meaningful description.

To really create a component (in a Deact way), the function fc() has to be used. The only parameter of the fc() function is a builder function that has to return a node and accepts a ComponentContext. This is required to use component-specific functionality of Deact.

State

Local state

A component can have a state. To access the state of a component, the function state() of the ComponentContext is used. A state has a name and a type.

DeactNode statefulComponent() => fc((ctx) {
      final counter = ctx.state<int>('counter', 0);
      return div(onclick: (_) => counter.set((c) => c + 1), children: [txt('Counter: ${counter.value}')]);
    });

In the example above a state with the name counter and the initial value 0 is created. A state is represented by an instance of the State class. The actual value of a state can be accessed by the getter value. To set a new value for the state, the function set() or the setter value is used. Alternatively, when the value of a state is a more compley type and only parts of it should be updated, the function update()can be used. In both cases, the component and all its children will be rerendered after the state value was updated.

Global state

State created by the function state()is local to the component. If it is required to share state over multiple components, a GlobalStateProviderComponent can be used. A global state provider is a node and thus, it can be placed everywhere in the node hierarchy. Every component beneath a global state provider can access the state of the provider using the method globalState() of the ComponentContext to read or update it like a local state.

void main() {
  deact(
      '#root',
      (_) => globalState<int>(
          name: 'counter',
          initialValue: 0,
          children: [
            incrementor(),
            display(),
          ],
        ));
}

DeactNode incrementor() => fc((ctx) {
      final counter = ctx.globalState<int>('counter');
      return button(onclick: (_) => counter.set((c) => c + 1), children: [txt('Click me to increment to counter')]);
    });

DeactNode display() => fc((ctx) {
      final counter = ctx.globalState<int>('counter');
      return div(children: [txt('Counter: ${counter.value}')]);
    });

Above, a global state with name counter and the initial value 0 is introduced on the top level of the node hierarchy. The components incrementor and display are children of the provider. The component incrementor updates the state and the component display reads the state.

It is also possible to let a component implement the interface GlobalStateProvider. In this case, all local states of the compoenent is global to all its children.

Effects

An effect is a function, that may be called if

• a component is added to the node hierarchy
• a component is rerendered
• the state of a component has changed

A component can have multiple effects and for each effect, it can be configured on which event it will be triggered.

An effect can have a cleanup function. The cleanup is called depending how the corresponding effect is configured.

If the effect is called when the component was added to the node hierarchy, the cleanup will called, when the component was removed from the hierarchy. If the effect is called on every rerender or in succession to a state change, the cleanup will be called before the effect is called the next time.

DeactNode componentWithEffect() => fc((ctx) {
      final counter = ctx.state<int>('counter', 0);
      ctx.effect('myEffect', () {
          // do something...
          ...

          return () {
            // do some cleanup...
            ...
          };
      }, [counter]);

      ...
    });

In the example above, the effect myEffect is executed every time the state counter has changed. The effect depends on the state counter. The function return by the effect is the cleanup function. The cleanup is executed before the next time, the effect is executed.

If the effect depends on an empty list of states, the effect is only executed, when the component is added to the node hierarchy. The cleanup function is called, when the component is removed from the node hierarchy.

If nullis provided as the list of dependencies, the effect is executed every time the component rerenders. The cleanup is executed before the next time, the effect is executed (but not before the first time the effect is executed).

Examples for the usage of effects are

• executed HTTP requests
• acquire and release resources

References

A reference holds a reference to a value. A reference can be local or global. A reference persists until the component, which has created the reference is removed from the node hierarchy. Changing the reference value will NOT force the component to rerender.

Local references

A local reference is created by calling the ref() method of the ComponentContext. A reference has a name and an optional initial value. The value of the reference can be accessed by value memeber.

A special way to set the value of a reference is to provide the reference to the ref parameter of an element node.

DeactNode refs() => fc((ctx) {
      final inputRef = ctx.ref<InputElement?>('input');

      return fragment([
        button(
          onclick: (_) => inputRef.value?.focus(),
          children: [txt('Click me to focus the input element!')],
        ),
        input(ref: inputRef),
      ]);
    });

In this example, a reference to a InputElement is created. The initial value is null. The reference is provided as parameter to the input() function. When the underlying DOM element is created, it is assigned to value of the reference.

Global references

A global reference is introduced using the function globalRef() which creates an instance of a GloablRefProviderComponent component. All children of this component can access the global reference by calling the gloablRef<T>(String) method of the ComponentContext. The same rules of how to find a global state apply here.

void main() {
  deact(
      '#root',
      (_) => globalRef<int>(
          name: 'counter',
          initialValue: 0,
          children: [
            incrementor(),
            display(),
          ],
        ));
}

DeactNode incrementor() => fc((ctx) {
      final counter = ctx.globalRef<int>('counter');
      return button(
        onclick: (_) => counter.value = counter.value + 1,
        children: [txt('Click me to increment to counter')],
      );
    });

DeactNode display() => fc((ctx) {
      final counter = ctx.state<int>('counter', 0);
      ctx.effect('init', () {
        // listen to changes of the value of the 'counter' reference
        ctx.globalRef<int>('counter').onChange.listen((c) {
          // update the internal state of the display component.
          // this forces the component to be rerendered. but you
          // do some stuff, that do not force a rerender.
          counter.value = c;
        });
        return null;
      }, dependsOn: []);
      return div(children: [txt('Counter: ${counter.value}')]);
    }, key: 'display');

As you can see, a reference provices a stream of value change events.

It is also possible to let a component implement the interface GlobalRefProvider. In this case, all local references of the compoenent is global to all its children.

Installing

Use this package as a library

Depend on it

Run this command:

With Dart:

 $ dart pub add deact

With Flutter:

 $ flutter pub add deact

This will add a line like this to your package's pubspec.yaml (and run an implicit dart pub get):

dependencies:
  deact: ^1.2.0

Alternatively, your editor might support dart pub get or flutter pub get. Check the docs for your editor to learn more.

Import it

Now in your Dart code, you can use:

import 'package:deact/deact.dart';

example/README.md

Examples

helloworld

A very simple Deact application that display Hello World.

component

Show the usage of components.

effects

Shows the usage of effects.

globaelrefs

Shows the usage of global references.

globalstate

Shows the usage of global state.

helloworld

A simple Hello World application.

performance

A Deact implementation of the application as decribed at How to Benchmark React Components: The Quick and Dirty Guide

refs

Shows the usage of references.

state

Shows the usage of component local state.

Experimental

Deact has no stable release yet. Functionality is not yet complete. The API may change and maybe in a breaking way.

Actually, Deact is tested in an internal project.

If you will try Deact: Feedback is welcome!

Original article source at: https://pub.dev/packages/deact 

#flutter #dart #ui #react 

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How native is React Native? | React Native vs Native App Development

If you are undertaking a mobile app development for your start-up or enterprise, you are likely wondering whether to use React Native. As a popular development framework, React Native helps you to develop near-native mobile apps. However, you are probably also wondering how close you can get to a native app by using React Native. How native is React Native?

In the article, we discuss the similarities between native mobile development and development using React Native. We also touch upon where they differ and how to bridge the gaps. Read on.

A brief introduction to React Native

Let’s briefly set the context first. We will briefly touch upon what React Native is and how it differs from earlier hybrid frameworks.

React Native is a popular JavaScript framework that Facebook has created. You can use this open-source framework to code natively rendering Android and iOS mobile apps. You can use it to develop web apps too.

Facebook has developed React Native based on React, its JavaScript library. The first release of React Native came in March 2015. At the time of writing this article, the latest stable release of React Native is 0.62.0, and it was released in March 2020.

Although relatively new, React Native has acquired a high degree of popularity. The “Stack Overflow Developer Survey 2019” report identifies it as the 8th most loved framework. Facebook, Walmart, and Bloomberg are some of the top companies that use React Native.

The popularity of React Native comes from its advantages. Some of its advantages are as follows:

• Performance: It delivers optimal performance.
• Cross-platform development: You can develop both Android and iOS apps with it. The reuse of code expedites development and reduces costs.
• UI design: React Native enables you to design simple and responsive UI for your mobile app.
• 3rd party plugins: This framework supports 3rd party plugins.
• Developer community: A vibrant community of developers support React Native.

Why React Native is fundamentally different from earlier hybrid frameworks

Are you wondering whether React Native is just another of those hybrid frameworks like Ionic or Cordova? It’s not! React Native is fundamentally different from these earlier hybrid frameworks.

React Native is very close to native. Consider the following aspects as described on the React Native website:

• Access to many native platforms features: The primitives of React Native render to native platform UI. This means that your React Native app will use many native platform APIs as native apps would do.
• Near-native user experience: React Native provides several native components, and these are platform agnostic.
• The ease of accessing native APIs: React Native uses a declarative UI paradigm. This enables React Native to interact easily with native platform APIs since React Native wraps existing native code.

Due to these factors, React Native offers many more advantages compared to those earlier hybrid frameworks. We now review them.

#android app #frontend #ios app #mobile app development #benefits of react native #is react native good for mobile app development #native vs #pros and cons of react native #react mobile development #react native development #react native experience #react native framework #react native ios vs android #react native pros and cons #react native vs android #react native vs native #react native vs native performance #react vs native #why react native #why use react native

Wondering how to upgrade your skills in the pandemic? Here's a simple way you can do it.

Corona Virus Pandemic has brought the world to a standstill.

Countries are on a major lockdown. Schools, colleges, theatres, gym, clubs, and all other public places are shut down, the country’s economy is suffering, human health is on stake, people are losing their jobs and nobody knows how worse it can get.

Since most of the places are on lockdown, and you are working from home or have enough time to nourish your skills, then you should use this time wisely! We always complain that we want some ‘time’ to learn and upgrade our knowledge but don’t get it due to our ‘busy schedules’. So, now is the time to make a ‘list of skills’ and learn and upgrade your skills at home!

And for the technology-loving people like us, Knoldus Techhub has already helped us a lot in doing it in a short span of time!

If you are still not aware of it, don’t worry as Georgia Byng has well said,

“No time is better than the present”

– Georgia Byng, a British children’s writer, illustrator, actress and film producer.

No matter if you are a developer (be it front-end or back-end) or a data scientist, tester, or a DevOps person, or, a learner who has a keen interest in technology, Knoldus Techhub has brought it all for you under one common roof.

From technologies like Scala, spark, elastic-search to angular, go, machine learning, it has a total of 20 technologies with some recently added ones i.e. DAML, test automation, snowflake, and ionic.

How to upgrade your skills?

Every technology in Tech-hub has n number of templates. Once you click on any specific technology you’ll be able to see all the templates of that technology. Since these templates are downloadable, you need to provide your email to get the template downloadable link in your mail.

These templates helps you learn the practical implementation of a topic with so much of ease. Using these templates you can learn and kick-start your development in no time.

Apart from your learning, there are some out of the box templates, that can help provide the solution to your business problem that has all the basic dependencies/ implementations already plugged in. Tech hub names these templates as xlr8rs (pronounced as accelerators).

xlr8rs make your development real fast by just adding your core business logic to the template.

If you are looking for a template that’s not available, you can also request a template may be for learning or requesting for a solution to your business problem and tech-hub will connect with you to provide you the solution. Isn’t this helpful 🙂

Confused with which technology to start with?

To keep you updated, the Knoldus tech hub provides you with the information on the most trending technology and the most downloaded templates at present. This you’ll be informed and learn the one that’s most trending.

Since we believe:

“There’s always a scope of improvement“

If you still feel like it isn’t helping you in learning and development, you can provide your feedback in the feedback section in the bottom right corner of the website.

#ai #akka #akka-http #akka-streams #amazon ec2 #angular 6 #angular 9 #angular material #apache flink #apache kafka #apache spark #api testing #artificial intelligence #aws #aws services #big data and fast data #blockchain #css #daml #devops #elasticsearch #flink #functional programming #future #grpc #html #hybrid application development #ionic framework #java #java11 #kubernetes #lagom #microservices #ml # ai and data engineering #mlflow #mlops #mobile development #mongodb #non-blocking #nosql #play #play 2.4.x #play framework #python #react #reactive application #reactive architecture #reactive programming #rust #scala #scalatest #slick #software #spark #spring boot #sql #streaming #tech blogs #testing #user interface (ui) #web #web application #web designing #angular #coronavirus #daml #development #devops #elasticsearch #golang #ionic #java #kafka #knoldus #lagom #learn #machine learning #ml #pandemic #play framework #scala #skills #snowflake #spark streaming #techhub #technology #test automation #time management #upgrade

10 Top Web Development Frameworks for Assured Success of Your Project - PixelCrayons

Web development frameworks are a powerful answer for businesses to accomplish a unique web app as they play a vital role in providing tools and libraries for developers to use.

Most businesses strive to seek offbeat web applications that can perform better and enhance traffic to the site. Plus, it is imperative to have such apps as the competition is very high in the digital world.

Developers find it sophisticated to use the libraries and templates provided by frameworks to make interactive and user-friendly web applications. Moreover, frameworks assist them in increasing the efficiency, performance, and productivity of the web development task.

Before getting deep into it, let’s have a quick glance at the below facts and figures below that will help you comprehend the utility of the frameworks.

As per Statista, 35.9% of developers used React in 2020.
25.1% of developers used the Angular framework worldwide.
According to SimilarTech, 2,935 websites use the Spring framework, most popular among the News and Media domain.

What is a Framework?
A framework is a set of tools that paves the way for web developers to create rich and interactive web apps. It comprises libraries, templates, and specific software tools. Additionally, it enables them to develop a hassle-free application by not rewriting the same code to build the application.

There are two categories of frameworks: the back-end framework, known as the server-side, and the front-end framework, known as the client-side.

The backend framework refers to a web page portion that you can not see, and it communicates with the front end one. On the other hand, the front-end is a part of the web that users can see and experience.

You can understand by an example that what you see on the app is the front-end part, and the communication you make with it is the part of the back end.

Read the full blog here

Hence, depending on your web development application requirements, you can hire web developers from India’s best web development company. In no time, you will be amongst those who are reaping the results of using web development frameworks for the applications.

#web-development-frameworks #web-frameworks #top-web-frameworks #best-web-development-frameworks

Top 3 Golang Web Frameworks In 2021

Golang is one of the most powerful and famous tools used to write APIs and web frameworks. Google’s ‘Go’ otherwise known as Golan orders speedy running local code. It is amazing to run a few programming advancements rethinking specialists and software engineers from various sections. We can undoubtedly say that this is on the grounds that the engineers have thought that it was easiest to utilize Go. It is always considered as ago for web and mobile app development because it is ranked highest among all the web programming languages.

Top 3 Golang web frameworks in 2021:

1.Martini: Martini is said to be a low-profile framework as it’s a small community but also known for its various unique things like injecting various data sets or working on handlers of different types. It is very active and there are some twenty and above plug-ins which could also be the reason for the need for add-ons. It deals with some principles of techniques like routing, dealing, etc, basic common tricks to do middleware.

2.Buffalo: Buffalo is known for its fast application development services. It is a complete process of starting any project from scratch and providing end to end facility for back-end web building. Buffalo comes with the dev command which helps directly to experience transformations in front of you and redevelop your whole binary. It is rather an ecosystem used to create the best app development.

3.Gorilla: Gorilla is the largest and longest-running Go web framework. It can be little and maximum for any user. It is also the biggest English-speaking community that comes with robust web sockets features so you can attach the REST codes to the endpoints giving a third-party service like Pusher.

So, these are some web frameworks that can be used for Golang language. Each framework has its unique points which are only found in them but all of them are the best. IF your developer is in search of one this is where you can find the best.

#top 3 golang web frameworks in 2021 #golang #framework #web-service #web #web-development

React Starter Kit: Build Web Apps with React, Relay and GraphQL.

React Starter Kit — "isomorphic" web app boilerplate   

React Starter Kit is an opinionated boilerplate for web development built on top of Node.js, Express, GraphQL and React, containing modern web development tools such as Webpack, Babel and Browsersync. Helping you to stay productive following the best practices. A solid starting point for both professionals and newcomers to the industry.

See getting started guide, demo, docs, roadmap  |  Join #react-starter-kit chat room on Gitter  |  Visit our sponsors:

 

Hiring

Getting Started

• Follow the getting started guide to download and run the project (Node.js >= 8.16.2)
• Check the code recipes used in this boilerplate, or share yours

Customization

The master branch of React Starter Kit doesn't include a Flux implementation or any other advanced integrations. Nevertheless, we have some integrations available to you in feature branches that you can use either as a reference or merge into your project:

• feature/redux (PR) — isomorphic Redux by Pavel Lang (see how to integrate Redux) (based on master)
• feature/apollo (PR) — isomorphic Apollo Client by Pavel Lang (see Tracking PR #1147) (based on feature/redux)
• feature/react-intl (PR) — isomorphic Redux and React Intl by Pavel Lang (see how to integrate React Intl) (based on feature/apollo)
• feature/apollo-pure (PR) — Apollo devtools and TypeScript integration by piglovesyou (based on master)

You can see status of most reasonable merge combination as PRs labeled as TRACKING

If you think that any of these features should be on master, or vice versa, some features should removed from the master branch, please let us know. We love your feedback!

Comparison

	React Starter Kit	React Static Boilerplate	ASP.NET Core Starter Kit
App type	Isomorphic (universal)	Single-page application	Single-page application
Frontend
Language	JavaScript (ES2015+, JSX)	JavaScript (ES2015+, JSX)	JavaScript (ES2015+, JSX)
Libraries	React, History, Universal Router	React, History, Redux	React, History, Redux
Routes	Imperative (functional)	Declarative	Declarative, cross-stack
Backend
Language	JavaScript (ES2015+, JSX)	n/a	C#, F#
Libraries	Node.js, Express, Sequelize, GraphQL	n/a	ASP.NET Core, EF Core, ASP.NET Identity
SSR	Yes	n/a	n/a
Data API	GraphQL	n/a	Web API

Backers

♥ React Starter Kit? Help us keep it alive by donating funds to cover project expenses via OpenCollective or Bountysource!

 

How to Contribute

Anyone and everyone is welcome to contribute to this project. The best way to start is by checking our open issues, submit a new issue or feature request, participate in discussions, upvote or downvote the issues you like or dislike, send pull requests.

Learn More

• Getting Started with React.js
• Getting Started with GraphQL and Relay
• React.js Questions on StackOverflow
• React.js Discussion Board
• Flux Architecture for Building User Interfaces
• Enzyme — JavaScript Testing utilities for React
• Flow — A static type checker for JavaScript
• The Future of React
• Learn ES6, ES6 Features

Related Projects

• GraphQL Starter Kit — Boilerplate for building data APIs with Node.js, JavaScript (via Babel) and GraphQL
• Membership Database — SQL schema boilerplate for user accounts, profiles, roles, and auth claims
• Babel Starter Kit — Boilerplate for authoring JavaScript/React.js libraries

Support

• #react-starter-kit on Stack Overflow — Questions and answers
• #react-starter-kit on Gitter — Watch announcements, share ideas and feedback
• GitHub issues, or Scrum board — File issues, send feature requests
• appear.in/react — Open hours! Exchange ideas and experiences (React, GraphQL, startups and pet projects)
• @koistya on Codementor, or Skype — Private consulting

License

Copyright © 2014-present Kriasoft, LLC. This source code is licensed under the MIT license found in the LICENSE.txt file. The documentation to the project is licensed under the CC BY-SA 4.0 license.

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Author: kriasoft
Source Code: https://github.com/kriasoft/react-starter-kit
License: MIT License

#graphql #react