Introduction to React Motion Tutorial

  • React Motion is an animation library loved within the React community.
  • Just like React, state dictates when your React components will render, and likewise, state dictates the animations in React motion.
  • To start with React Motion, we’ll want to import 2 libraries: – – will be used to wrap around our component and is a function which controls the speed in which a number will animate from its beginning value to the ending value.
  • Now all you need to animate the Forecast component into and off of the screen is to change the state’s value, and as its changed, and will animate the properties back and forth.
  • Today we looked at React Motion, one of the many animation libraries out there, but one that works particularly well with React.

React Motion is an animation library loved within the React community. I have to say that having some experience with libraries like GSAP, it isn’t the easiest to comprehend, but its power comes from the ability to directly tie animations to your state.
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react-compound-slider — React compound slider | Next level slider component 🎰 #ReactJS

react-compound-slider — React compound slider | Next level slider component 🎰   #ReactJS

  • To install and save in your dependencies, run: – – This library takes a compound component approach to creating sliders that separates the data/logic from presentation.
  • The components use the function as child components pattern.
  • By taking this approach it also frees you up to render whatever markup you want to customize your slider.
  • In general slider components are composed of a relatively positioned outer div with elements absolutely positioned inside by a percentage.
  • In this library the , , and components are used as children to the component and they let you tap into a stream of values and percentages that you can then use to render your own components.

react-compound-slider – React Compound Slider | Next Level Slider Component :slot_machine:
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Deep dive into observed Components with React.js and FrintJS

  • Higher-order componentThe API of the observe higher-order component (HoC) is quite simple:import React from ‘react’;import { observe } from ‘frint-react’;function MyComponent(props) { return div…/div;}const ObservedComponent = default ObservedComponent;It receives a function (that we called fn above), where you can generate your props that will be ultimately passed to your target…
  • Generating props synchronouslyThe fn function also gives you access to the FrintJS App’s instance:const ObservedComponent = observe(function (app) { // this will be the `props` in MyComponent return {}; })(MyComponent);Since you have access to your app instance, you can also get values from it, including providers:const ObservedComponent = observe(function (app)…
  • Because they have this dynamic nature, the observe HoC gives you access to parent props as an Observable:const ObservedComponent = observe(function (app, props$) { // …})(MyComponent);In addition to your FrintJS App instance (app), there is a second argument props$, which is props passed down to you from the parent Component…
  • But as your application grows, there will be times, when you need to work with multiple Observables and return a single props stream.This is where a helper function called streamProps shipped with frint-react can come handy.If you are an RxJS ninja, you may skip this part =DThe streamProps function will…
  • In that case, you may want to pass some default props to your target component before new values are generated.The streamProps helper function receives an optional first argument, where you can pass your default props:import { streamProps } from ‘frint-react’;const defaultProps = { foo: ‘n/a’, bar: ‘n/a’, baz: ‘n/a’,};const props$…

Our focus in this article will be about using the observe higher-order component, shipped from frint-react package. To make the most out of this, it is advised that you read these previous articles…
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How to adjust for React.js sometimes handling state updates asynchronously

How to adjust for React.js sometimes handling state updates asynchronously  #javascript

  • How to adjust for React.js sometimes handling state updates asynchronouslyCalling this.setState() in a React component is fundamental to the framework.
  • Though updating the values of the state seems like a simple operation that wouldn’t need to be asynchronous, because these state updates trigger re-rendering, which can get expensive if it’s done again and again, sometimes React batches state updates together in order to only trigger one re-render at the completion of all the updates.How should we deal with this potentially asynchronous behavior?If you are using the current state or props inside your setState call, pass an updater function (rather than an object) into setState to make sure that the right values are used even when updates are batched.
  • See this example from the React documentation:// Wrong this.setState({ counter: this.state.counter + this.props.increment, });// Correct this.setState((prevState, props) = ({ counter: prevState.counter + props.increment }));Put any code that needs to be executed after setState() into either:a callback function (passed as the second argument to setState, called when the state has finished updating).
  • a React lifecycle hook that will be triggered after the state-change causes the component to re-render (such as componentDidMount or componentDidUpdate).
  • The most popular way to deal with asynchronous functions in JS is currently promises, but this is not recommended with React because that would make every setState operation asynchronous, when not all of them need to be batched.

Calling this.setState() in a React component is fundamental to the framework. This is how the state is updated, and also triggers the re-rendering of the component. However, despite its familiarity…
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Make things that matter, together.

  • We believe everyone deserves to work on products that will be used, enjoyed, and loved – products that matter.
  • Truly excellent products are a team effort.
  • It’s our mission to help product leaders across the globe cultivate these values in their organizations, and we’ve adopted them as well.
  • With productboard, every team can make things that matter – together.

Meet the team behind productboard and find out why we do what we do and how we do the magic.

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Getting up and running with #reactjs @FableCompiler and Suave on #netcore #fsharp

  • The Fable compiler is used to compile the F# client code to JavaScript so that it can run in the browser.
  • If you look at then you will see code that is shared between client and server.
  • NET core and for the client the Fable compiler is translating it into JavaScript.
  • With Expecto you write tests as values in normal code.
  • If you are in development mode then you can use Expecto’s focused test feature to run a selected test against the running server.

fable-suave-scaffold – Working sample of a Suave + Fable + Elmish project with hot reloading
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React-motion 101: Springs – Bjorn Holdt – Medium

React-motion 101: Springs  #reactjs #reactmotion #javascript #react #animation #reactjs

  • Box 2 is different.
  • Instead the law of physics, in particular a spring, was used to create the animation.
  • You can tell a spring was used because towards the end of the animation, it takes a while for the box to settle into its final position.
  • Box 1, 3 and 4 animation will look a bit jarring if we interrupt it.
  • Box 2 on the other hand handles the change gracefully and naturally springs into its new position (play around with these values on codepen)Stiffness and damping to change animationIn a spring animation, there are two variables you can control: stiffness and damping.

Boxes 1, 3 and 4 all used different timing functions (ease-in, ease-out, linear). However, they were all timed animations set to run for 500ms. Box 2 is different. The animation wasn’t set to run for…
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How to Create a Redux Form with Validation and Initialized Values

Create a Redux-Form with validation and initialized values:  #ReactJS #Redux #JavaScript

  • Even better, with the latest release candidate (Redux Form 6.0.0rc3) and later, you can upgrade to the latest version of React and not have those pesky errors bring your project to a screeching halt.
  • This tutorial is going to help you set up a Redux Form that uses the latest syntax, and how to get that form set up with some simple validation and initial values.
  • Open up your console and use to install the Redux Form release candidate:

    Our tutorial will also be dependent on and , so make sure you have the latest versions of those installed as well.

  • So just underneath our dependencies, outside of the scope of the component, add the following:

    Handling the validation of our form can get messy if we do it “inline” as part of the render function of our component.

  • So to clean that up and make it reusable (plus easier to manage), create a that returns the input and logic for any errors that our field receives:

    Let’s also create a similar constant that will serve our input:

    Now we need to define the redux form required property inside the render function of the component.

With the latest version of redux form available we take a look at the best way to create a form that starts with pre-populated fields and validation.
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What is Reactive Programming? – Qlik Branch

What is Reactive Programming?  #ReactJS #JavaScript

  • While an interaction like this one seems simple at first, as more and more dynamic pieces are added to an app, the logic for defining state and mapping to rendering can become twisted and convoluted.This dependency nest can produce code that’s difficult to reason about, code, and maintain overtime with imperative coding.Enter reactive programming.Reactive programming is an approach that models data that changes over time.
  • It is a value that changes over time, based on its source changing over time, rather than a value declared once.Now chances are, you already have done reactive programming like the previous example.
  • It turns out, Microsoft Excel is a reactive programming interface!b = a + 1, in ExcelThe value in this type of programming is that you can write logical code to define the relationships between changing entities over time.
  • These relationships are compose-able and can be defined synchronously, making it easy to interpret, support, and expand the logic over time.Visualizing with MarblesIn order to reason about the logic defining these changing values over time, reactive programmers often use what are called marble diagrams to show how a value changes over time based on other values.
  • Our b = a + 1 example in a marble diagram might look like so:Marble diagram for b = a + 1A more practical example is event listeners, another way in which you have probably already used reactive programming concepts.

When building interactive web applications, the complexity of an app’s logic can grow unwieldy as the app grows in scope. A lot of this complexity is owed to a continuously morphing state. When we…
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Reactive Programming Operators (update 02/16)

Get to know reactive programming operators (updated 02/17):  #ReactJS #JavaScript

  • The map operator is a common way of transforming values emitted over time.
  • In the following example, it passes each value through a transformation function “colored to black & white“:

    Like map, the scan operator applies a function to a stream of values: an accumulator function.

  • On the other hand, zip combines vertically the events of multiple event streams.
  • It takes the n-th color and n-th shape to produce the n-th coloredShape:

    Similarly to zip, combineLatest merges the events of multiple event streams.

  • But whenever any event stream emits a value, combineLatest computes a new coloredShape using the latest color and the latest shape:

    A new animated series will start soon.

In this new series we focus on operators for Reactive Programming. They are essential to react to data in your application.
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