Rendering a function with React – kentcdodds

  • But there are reasons for the API as it is and that’s not what we’re going over in this newsletter…With ReactSo thinking about this in the context of React:const getHomeContent = getContent(‘pages.home’)const ui = ( a href=”/about” {getHomeContent(‘nav.about’)} /a)// that’ll get you:a href=”/about”About/aSo far so good.
  • Anyway, this will break the app:const getHomeContent = getContent(‘pages.typo’)const ui = ( a href=”/about” {getHomeContent(‘nav.about’)} /a)// 💥 error 💥Again, this is happening because getContent(‘pages.typo’) will return the string {pages.typo} (to indicate that there’s no content at that path and the developer needs to fix that problem to get the content)….
  • The issue is that you can’t invoke a string but that’s what’s happening because getHomeContent is a string, not a function.A solution and a new problemSo the change I made this week makes it so when there’s no content at a given path, instead of a string, it returns a “sorta-curried”…
  • No problem.So now this wont throw an error, but we lose rendering the path if there’s no content!const getHomeContent = getContent(‘pages.typo’)const ui = ( a href=”/about” {getHomeContent(‘nav.about’)} /a)// that’ll get you:a href=”/about”/aAnd we want to make sure that we show the missing content so it’s more obvious for developers (yes…
  • Let’s rewrite the above to make this more clear:const getHomeContent = getContent(‘pages.typo’)const aboutContent = ui = a in this example is a function because the call to getContent had a typo, so we’ll never actually find content that matches the full path.

NOTE: This is a cross-post from my newsletter. I publish each email two weeks after it’s sent. Subscribe to get more content like this earlier right in your inbox! 💌 This week I was working on an…
Continue reading “Rendering a function with React – kentcdodds”

Improving the usability of your modules – kentcdodds

Improving the usability of your modules  #reactjs

  • All you have to do is use it:import getContentForFile from ‘react-i18n’const i18n = App() { return ( div h1{i18n(‘header.title’)}/h1 /div )}So that’s how it works (again, I’m sure some of you are thinking of other libs that could do this better, but please spare me the “well actually.” I’m aware…
  • const content = JSON.parse( … more stuffexport {getContentForFile as default, init}This presents a few challenges for users of the module.
  • Turns out that react-i18n actually exposed another module react-i18n/bootstrap to customize this behavior which is great, but that doesn’t resolve the problem of stuff happening if someone were to import react-i18n first.So what I did was a wrapped all side-effects in a function I exported called init(which was similar to…
  • But it’s ok now because that’s clear const messages = JSON.parse( ) // … other other stuff}// … more stuffexport {getContentForFile as default, init}So this means that anyone using the module now must call the init function, but they’re doing that on their own terms and whenever they want it…
  • However, we’re in the process of “inner sourcing” this module (and perhaps open sourcing it eventually), so folks are going to use it who use different tools and have different use cases.So, if it’s not too much work and doesn’t add too much complexity, then try to make the solution…

NOTE: This is a cross-post from my newsletter. I publish each email two weeks after it’s sent. Subscribe to get more content like this earlier right in your inbox! 💌 This last week I worked on my…
Continue reading “Improving the usability of your modules – kentcdodds”

React.js: The Hard Parts

State Management without #Redux:  by #ReactJS

  • If a user interacts with your application or refreshes the page, then we’ll look up state at that moment and rebuild the page.
  • In dynamic apps, like ones built using React, state change has to be dealt with immediately.
  • Managing state can get complicated if each component has some state.
  • Interaction with the components, like a mouse click, trigger these functions to update state.
  • For example to implement retweets: – – When the state is updated, the props will change too and render the child components again.

I am a full-stack software developer and passionate educator. I have been building for the web for almost two decades.
Continue reading “React.js: The Hard Parts”

Text Input Mask for React Native – CloudBoost

Text Input Mask for React Native.



#reactJS #javascript

  • Text Input Mask for React NativeWhen I first time got a task in the project I was working on to make a masked text input in React Native, I absolutely didn’t expect that it would be so difficult to implement.
  • I just thought “ok, will install some RN module or make it by myself using onChangeText”, yep…After many attempts with methods of TextInput like onChangeText, onKeyPress, selection I finally did it with not good performance for iOS, but not for Android, because onKeyPress method of TextInput is not implemented for Android yet.
  • More over there was no selection property yet in the version of React Native I was working on to change a position of carriage, so I had to write it by myself in Objective-C and Java, imagine how I was wondering when saw it in the next version of RN :)I didn’t find any solution and module that fits my needs to close the task so decided to write my own one, here it is:I’ve just integrated these great native RedMadRobot’s libraries to React Native:Installationnpm install –save link Android it just works.For iOS you have to drag and drop InputMask framework to Embedded Binaries in General tab of Target and check ‘Yes’ in ‘Always Embed Swift Standart Libraries’ of Build Settings.

When I first time got a task in the project I was working on to make a masked text input in React Native, I absolutely didn’t expect that it would be so difficult to implement. I just thought “ok…
Continue reading “Text Input Mask for React Native – CloudBoost”

React.js: The Hard Parts

State Management without #Redux:  #ReactJS #Javascript

  • If a user interacts with your application or refreshes the page, then we’ll look up state at that moment and rebuild the page.
  • In dynamic apps, like ones built using React, state change has to be dealt with immediately.
  • Managing state can get complicated if each component has some state.
  • Interaction with the components, like a mouse click, trigger these functions to update state.
  • For example to implement retweets:

    When the state is updated, the props will change too and render the child components again.

I am a full-stack software developer and passionate educator. I have been building for the web for almost two decades.
Continue reading “React.js: The Hard Parts”

React.js: The Hard Parts

  • If a user interacts with your application or refreshes the page, then we’ll look up state at that moment and rebuild the page.
  • In dynamic apps, like ones built using React, state change has to be dealt with immediately.
  • Managing state can get complicated if each component has some state.
  • Interaction with the components, like a mouse click, trigger these functions to update state.
  • For example to implement retweets:

    When the state is updated, the props will change too and render the child components again.

I am a full-stack software developer and passionate educator. I have been building for the web for almost two decades.
Continue reading “React.js: The Hard Parts”

Enlightened Views — Creating a library for cutting-edge UI patterns in React Native { author: @fiber_god }

  • RN uses the native elevation prop on Android, and for iOS, you have to set a style configuration consisting of opacity, offset, color, and radius.
  • This worked well, but it had a few problems: it wasn’t touchable, could only support elevation levels 1-5, and didn’t generate any feedback.
  • I also added its own feedback mode, which allows the user to configure the shadow to diminish or expand when interacted with, which leads to really cool effects.
  • Also on iOS, you can change the color of your shadow to be whatever you please.
  • I’d like to thank the author of for inspiring my work and to congratulate him for landing calculated iOS styles into his component recently.

Cross-Platform Elevation with React Native
Continue reading “Enlightened Views — Creating a library for cutting-edge UI patterns in React Native
{ author: @fiber_god }”