ReactJS – Parameterized Event Handlers ☞ #reactjs

ReactJS – Parameterized Event Handlers

☞ 

#reactjs

  • It is quite frequent requirement to pass parameters to event handlers of custom React components.
  • There are several ways to achieve this with ES6 depending on weather we need reference to the event or n

    We can simply define the event handler and bind it to using JavaScript’s function.

  • To avoid calling we can use ES6 arrow function which binds the function with automatically

    We can also pass additional parameters to event handlers.

  • To pass parameters to event handlers while using property initializer syntax, we need to use currying.
  • Provided all the different approaches above, using the arrow function with currying is the most efficient and cleaner way to define event handlers that accepts user defined parameters.

It is quite frequent requirement to pass parameters to event handlers of custom React components. There are several ways to achieve this with ES6 depending on weather we need reference to the event or n
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#reactjs”

Container Components – Learn React with chantastic – Medium

The container component pattern in #ReactJS is crucial:

  • Container ComponentsOne React pattern that’s had the impact on my code is the container component pattern.In Jason Bonta talk High Performance Components, there’s this little gem about container components.The idea is simple:A container does data fetching and then renders its corresponding sub-component.
  • “Corresponding” meaning a component that shares the same name:StockWidgetContainer = StockWidgetTagCloudContainer = = PartyPooperListYou get the idea.Why containers?Say you have a component that displays comments.
  • So, you put everything in one place:class CommentList extends React.Component { this.state = { comments: [] }; componentDidMount() { fetchSomeComments(comments = this.setState({ comments: comments })); } render() { return ( ul {this.state.comments.map(c = ( li{c.body}—{c.author}/li ))} /ul ); }}Your component is responsible for both fetching data and presenting it.
  • There’s nothing “wrong” with this but you miss out on a few benefits of React.ReusabilityCommentList can’t be reused unless under the exact same circumstances.Data structureYour markup components should state expectations of the data they require.
  • This time with a containerFirst, lets pull out data-fetching into a container component.class CommentListContainer extends React.Component { state = { comments: [] }; componentDidMount() { fetchSomeComments(comments = this.setState({ comments: comments })); } render() { return CommentList comments={this.state.comments} /; }}Now, let’s rework CommentList to take comments as a prop.const CommentList = props = ul {props.comments.map(c = ( li{c.body}—{c.author}/li ))} /ulExample CodepenSo, what did we get?We actually got a lot…We’ve separated our data-fetching and rendering concerns.We’ve made our CommentList component reusable.We’ve given CommentList the ability to set PropTypes and fail loudly.I’m a big fan of container components.

Say you have a component that displays comments. You didn’t know about container components. So, you put everything in one place: Your component is responsible for both fetching data and presenting…
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Simple tutorial to understand props vs state in React.js by @jjude

Simple tutorial to understand #props vs #state in #ReactJS - @jjude

  • Like parameters in functions, you can pass properties into react.js component.
  • If you want to understand the basics of React.js component, read Create React.js component with Typescript.
  • The property will be an input from the invoking component with the inital value for the Timer.
  • Let us see how to invoke this Timer component with an initial value.
  • Whenver a component calls , React.js calls its corresponding function.

Use props to send information to a component. Use state to manage information created and updated by a component.
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React Native Pitfalls – Anton Kulyk – Medium

React Native Pitfalls  #reactnative #react #reactjs #reactjs

  • React Native PitfallsThere are a lot of collections of anti-patterns for React and different app’s state managers like Redux and MobX (e.g. react-bits), but I haven’t seen a lot of advises for React Native developers.
  • You can create bridges between JavaScript and native modules, enable messaging between two sides of an app, create your own components.
  • Sometimes just a few lines of native code can save you from dozens of unneeded JavaScript.Do not estimate Android iOS equallyPersonally I spend much more time on configuring iOS apps.
  • Your apps are native and that’s awesome, but Android and iOS are different platforms, with different guidelines and components.
  • So develop and test both versions in parallel.Test on a device from the day oneEmulators are nice, but use devices, especially on Android because of variety of screen sizes, OS versions is use, etc.It won’t be iOS/Android only storySometimes people pick React Native for developing an app only for one platform (yep, seriously).

There are a lot of collections of anti-patterns for React and different app’s state managers like Redux and MobX (e.g. react-bits), but I haven’t seen a lot of advises for React Native developers. In…
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Understanding State and Props in React – Hacker Noon

Understanding State and Props in React @RuairidhWM  #JavaScript #Reactjs #WebDev

  • Understanding State and Props in ReactI’ve been playing around with React and Redux recently and thought I would start writing articles on concepts which I’ve had to wrap my head around.So unless you’ve been living in a cave for the past few years, you’ll know that React is an awesome front-end library developed by the good folks at Facebook to make life easier for developers.It’s different to Angular or other frameworks as it is purely front-end (though see the comments below for a great clarification on this).
  • With that said, it’s extremely powerful.One of the concepts I struggled to understand during my learning more about React was the interaction between State and Props.
  • If you’re at all familiar with React then you should know that props flow downwards from the parent component.There is also the case that you can have default props so that props are set even if a parent component doesn’t pass props down.This is why people refer to React as having uni-directional data flow.
  • What happens when a component receives data from someone other than the parent?
  • This is super cool because that means React takes care of the hard work and is blazingly fast.As a little example of state, here is a snippet from a search bar (worth checking out this course if you want to learn more about React)Class SearchBar extends Component { constructor(props) { super(props);this.state = { term: ” }; }render() { return ( div className=”search-bar” input value={this.state.term} onChange={event = / /div ); }onInputChange(term) { this.setState({term}); }}SUMMARYProps and State do similar things but are used in different ways.

I’ve been playing around with React and Redux recently and thought I would start writing articles on concepts which I’ve had to wrap my head around. So unless you’ve been living in a cave for the…
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No more hassle with React Native

No more hassle with @reactnative -  @ir_ignite @infinite_red #reactNative #ignite #devLife

  • If you have any experience with React Native, you’ll already know about some great React Native libraries.
  • You might have even heard about this awesome React Native repository where we can find wonderful libraries.
  • They have created Ignite, a framework (or kit) of libraries using best practices for React Native.
  • There are a lot of really cool things to learn, and I highly recommend you create a new Ignite app and check out the generated code.
  • I’ve previously talked about Ignite in this drip, the libraries they use and how to start a new app.

No more hassle with React Native
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April Meet Up

#wordpess #wcldn #development #reactjs #api #reactnative 11th april  see you there

  • If you order, please tell them you will be in the boardroom.
  • Please see their website for information for their food and drinks menu.
  • It is close to the following stations:

    – This station has step-free access from street to platform

    – This station has step-free access from street to train.

  • – This station has step-free access from street to train.
  • If you would like to sponsor food and/or drinks at the event, please contact us at [masked]

To Be Annouced
If you have a suggestion for a session or would like to speak, please contact us at

Food & Drinks
The Doggetts Coat & Badge serves food and drink.
You will need to
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