Building User Interfaces with Pure Functions and Function Composition in React

  • This idea is so important in React that React 0.14 introduced Stateless Functional Components which allows the code above to be written as normal functions (and which we’ll cover more in depth later in the course).
  • Perhaps one of my favorite things about React is it’s given me a light introduction to functional programming (FP) and a fundamental piece of FP are pure functions.
  • splice is not a pure function since each time we invoke it passing in the same arguments, we get a different result.
  • Well the main reason is React’s render method needs to be a pure function and because it’s a pure function, all of the benefits of pure functions now apply to your UI as well.
  • Another reason is that it’s a good idea to get used to making your functions pure and pushing “side effects” to the boundaries of your program.

👋 I’m Tyler. I’m a Google Developer Expert and a partner at React Training where we teach React online, in person, and build OSS like React Router.
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Animations In React.js – Duncan maina – Medium

Animations In React.js  #javascript

  • ReactCSSTransitionGroup requires three elements to work.A ReactCSSTransitionGroup elementAt least one item to render outCss to specify the animation type.The ReactCSSTransitionGroup element wraps the content that you want to appear with css transitionName=”example” …transition options… { items } /ReactCSSTransitionGroupThis element must be initiated with a transitionName, which tells react which css animation to render out.
  • The transitionName gets translated to a class name that you select in css, followed by the transition property..example-appear { opacity: { opacity: 1; transition: opacity 2s ease-in;}In this example the element will fade in from the background starting at an opacity of 0.01 to an opacity of 1 in two seconds.React.js allows you to set animations to elements in your react application with ReactCSSTransitionGroup api.
  • This allows other developers to get an idea of the exact state of the program at any given time.ReactCSSTransitionGroup works well for simple css animations but other options exist for more complex animations ie: animations that involve motion.
  • It also contains many of the popular animations styles such as: bouceOut, bounce, bounceIn, fadeIn , fadeOut , flip , headShake , jello, rotateOut , rotateOutDownLeft , rotateOutDownRight , rubberBand , { bounce } from ‘react-animations’;import { StyleSheet, css } from ‘aphrodite’;const styles = StyleSheet.create({ bounce: { animationName: bounce, animationDuration: ‘1s’ }})try them out at : for a full list of animations and instructions on usage see Motion: a javascript library that handles the physics of component animation and provides an easy to use api for accessing those animations.
  • find more information here: Nash Vail also wrote a great tutorial on motion that can be found here: defaultStyle={{x: 0}} style={{x: spring(10)}} {interpolatingStyle = div style={interpolatingStyle} /}/MotionReact Flip Move: react flip move is a library that allows you to animate flips for your react components.

Css Animations in react.js are handled through the ReactCSSTransitionGroup Api. It provides a way to perform css when components enter or leave the DOM. ReactCSSTransitionGroup requires three…
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JavaScript Design Patterns – Meryl Dakin – Medium

JavaScript Design Patterns  #softwaredesignpatterns #mvc #react #javascript #reactjs

  • The gif below shows the interaction among these.MVC DemonstrationThe Controller (animalsController) updates the View (animalList)The View (animalForm) delivers User input to the ControllerThe Controller updates the Model (Animal) of changes based on User inputThe Model notifies the Controller of the changes so the Controller can update the View (animalList)MVC ComponentsModel- The model works with the database and API’s to call for and structure the data for the app.
  • It informs the Controller of the current state of the data so the Controller can serve that information to the View.View- The view is the user interface of the app.
  • When the Model gets user data, it can change the state of the app and pass the new state back to the Controller.Controller- The controller is the go-between from Model and View.
  • Component Architecture of ZooBookIn React, the components act like Views on steroids.The Components all represent a rendered piece of the website, but they also do the work of maintaining state and logic (without a state management tool like Redux).
  • — Thinking in React, React.js DocsComponent DemonstrationThe layers we have are performing the following roles:Presentational Components:App: Renders the NavBar and ZooContainerNavBar: Renders links around the site and the site titleZooForm: Renders form for User inputZooList: Renders container for animals to be appended into a listAnimal: Renders each animal in ZooList“Smart” Component (maintains state):ZooContainer: This layer is special.

As a developer with experience in Rails and vanilla JavaScript but new to React.js, the most intimidating shift is going from Model-View-Controller architecture to Component architecture. This post…
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JavaScript: Why is React framework so popular?

#JavaScript: Why is the #ReactJS framework so popular?

  • In 2015 and 2016, a lot of the JavaScript recruitment requirements that I worked on, required developers to have experience in the Angular framework.
  • Although Google’s framework is still very popular, a lot of the more recent requirements have asked for experience with React instead.
  • In recruitment, we see a lot of trends and jobs in the tech sector that require experience with the latest framework or methodology of the month.
  • From the developer’s point of view

    According to Mark Brown from , the widespread adoption of React is down to the merits of one-way data flow, component hierarchies and simple explicit renders, making the task simpler and the code more predictable.

  • From the employer’s point of view

    According to , the reason why employers are switching to the framework is:

    “We’re seeing the benefits of React.js on a growing number of projects, large and small, while at the same time we continue to be concerned about the state and future of other popular frameworks like AngularJS.

At Corvus Recruitment we want to help you start doing something you love. We listen to what jobseekers & employers want tailoring our service to suit.
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React’s Components — The Building Blocks of React.js

React’s Components — The Building Blocks of React.js  #react #javascript #reactjs

  • There are a lot of things to think about when creating a component, but one important thing to remember is is to keep components small.It is pretty easy to create a component.First, component names always be capitalized.
  • In the below example, the component names are Welcome App.
  • The App component renders Welcome three times.In this particular example, the DOM renders the App component, which is made up of the Welcome component.
  • One thing that is important in knowing React.js components is this: All React components must act like pure functions with respect to their props.
  • Components can not modify their own props.Props is one way in which data is stored in React.

Components should be considered or looked at as the building blocks of React.js. Conceptually, they are similar to JavaScripts’ functions. There are a lot of things to think about when creating a…
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SVG in React – Etleap

If you want to use SVG in #ReactJS, here's a handy guide:

  • This component uses SVG to display the circular progress bar and works just like any other React component.
  • The reason we opted for SVG in this case was that creating a circular progress bar in CSS is tricky.
  • The essential SVG markup required to render the progress bar is very simple:

    We need two circles, one for the dark background, and one for the lighter progress display.

  • SVG should not be a replacement for all graphical user elements, but can be used to more easily achieve tricky UI effects where CSS falls short.
  • That being said, CSS is catching up with SVG and has seen support for several filters, masks, and even custom clip paths.

React.js is a great library for creating user interfaces consisting of components. In the browser React is used to output DOM elements like divs, sections and.. SVG! The DOM supports SVG elements, so there is nothing stopping us from outputting it inline directly with React. This allows for easy creation of SVG components that are…
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Free React Fundamentals Course Updated for React v15.5 – WordPress Tavern

Free React Fundamentals Course Updated for React v15.5  via @wptavern #WordPress #reactjs

  • If you’re looking for ways to expand your ReactJS knowledge, the free React Fundamentals course from ReactTraining.com has been updated for the latest React v15.5 release.
  • In the React Fundamentals course students will get an introduction to the React ecosystem and will learn how to set up a React component with NPM, Babel, and Webpack.
  • Complete beginners may struggle, so the course author recommends students enter with a basic understanding of HTML, CSS, and JavaScript.
  • Last year’s State of JavaScript survey results showed React as the clear winner among front-end frameworks in terms of developer interest and satisfaction.
  • In addition to React Training’s fundamentals course, Codeacademy has two free courses for learning React.js and Wes Bos has a free course to help students get started with React.js, Redux, and React Router.

If you’re looking for ways to expand your ReactJS knowledge, the free React Fundamentals course from ReactTraining.com has been updated for the latest React v15.5 release. The 48-lesson course takes approximately 287 minutes to complete. It was designed for a wide range of professionals, including backend engineers new to JavaScript, Bootcamp graduates and front-end developers who want to expand their skill sets, and JavaScript developers coming from other frameworks.
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