Maximizing Debuggability with Redux – LogRocket

Maximizing Debuggability with Redux  #javascript #react #logging #debugging #redux #reactjs

  • By using front end logging tools like LogRocket, developers can easily understand and fix tricky bugs in production by reviewing the actions and state changes leading up to a bug.While this information is immediately useful in any Redux app, there is a lot more we can achieve by architecting an app with logging in mind.
  • When debugging issues, we can dig into this state object to see information on in-flight requests, queryCount (if we’re polling on a query), and timings.Storing this information in Redux is critical, since it puts full context on all network activity in the Redux logs.Rolling your own data fetching “framework”If you’d prefer a simpler approach, you can roll your own data fetching “framework” by simply dispatching explicit actions when querying and receiving data from the network.For example, lets say we’re building a blogging app.
  • This would then update state appropriately to:postsQuery: { url: ‘api.blog.com/posts’, isPending: true, data: […],}This example is far from thorough, but the idea is that by being explicit with Redux actions for each part of the request lifecycle, it becomes easy to debug any potential race condition or network error.Handling other sources of non-determinismIn addition to network fetching, there are lots of other sources of non-determinism that can cause bugs.
  • For example:myWebSocket.onmessage = function (event) { store.dispatch({ type: ‘BLOG_POST_UPDATE_RECEIVED’, payload: event, } store.dispatch({ type: ‘BLOG_POST_UPDATE_RECEIVED’, payload: event, }That way, when looking at the Redux logs for an error or user-reported issue, we can see all the data that was received over the websocket and, crucially, relate it in time to other redux actions and network requests.Local StorageOften, an app needs to read from local storage when it first starts up.
  • Once you get the library set up, you’ll see a new key in your Redux store called routing with information on the current router state.In addition, react-router-redux dispatches actions like @@router/LOCATION_CHANGE when its state changes.Also of note is that using react-router-redux lets you rewind router state when time-traveling in redux-devtools, since its state its state is derived from the state in Redux.A note about local vs Redux stateI don’t want to get into the debate on local vs Redux state here, but production Redux logging does change the calculus of this decision in some cases.

In my last blog post, Redux Logging in Production, I discussed one of the most important benefits of using Redux — debuggability. By using front end logging tools like LogRocket, developers can…
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The Complete Web Development Tutorial Using React and Redux Coupon Save 67 %

The Complete Web Development Tutorial Using React and Redux
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#reactjs

  • It allows the developer to write apps regardless of the environment, resulting in more consistently running apps.
  • Redux is a predictable state container for JavaScript apps.
  • In order for a change to be made, an action is emitted, which does not result in the state of the app to be changed but rather a new object to be returned.
  • The course answers questions such as what is React and its basic features such as components, state, properties and lifecycle; what is Redux and its basic features such as state, store and reducers; and even how to combine them together to create a brilliant app.
  • The course includes everything you need to know about React and Redux.

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The Firebase Blog: The beginners guide to React Native and Firebase

  • The onPress callback is a closure it has access to the outer environment which contains the item parameter.
  • Each one of the components is stored in the components folder.
  • import React, {Component} from ‘react’; import ReactNative from ‘react-native’; import * as firebase from ‘firebase’; const StatusBar = require(‘.
  • Which means an app is just a tree of components, starting with a root component.
  • ‘use strict’; import React, {Component} from ‘react’; import ReactNative from ‘react-native’; const styles = require(‘.

Read the full article, click here.


@Firebase: “THIS JUST IN! We updated our React Native tutorial to the new Firebase SDK. Enjoy!”


Here at Firebase, we’re big React fans. Firebase synchronizes application state, and React re-renders the application UI based on state changes. It’s a perfect fit.


The Firebase Blog: The beginners guide to React Native and Firebase

The Firebase Blog: Firebase and React Native

  • When the Firebase 3.x SDK was released at Google I/O, the authentication part of the SDK was no longer compatible with React Native.
  • The version also adds unauthenticated access from the Node.js SDK, which means you can initialize an app without a service account.
  • A service account is still required to create and verify tokens, but it isn’t necessary for all Node.js use cases.
  • Software Engineer Thanks to your continued feedback, Firebase now has broader support for React Native with version 3.1.0 of the JavaScript SDK .
  • With the latest SDK, we’ve relaxed this requirement, so you can initialize your app with just your database URL. import firebase from “firebase”; firebase.initializeApp({ databaseURL: ““, }); Without a service account, access to the Realtime Database will be restricted just like any other unauthenticated client.

Read the full article, click here.


@Firebase: “Firebase now works with React Native! Get the details in our latest blog post by @_jwngr”



The Firebase Blog: Firebase and React Native