Thunks in Redux: The Basics – Fullstack Academy – Medium

Thunks in #Redux : The Basics – Fullstack Academy – Medium  #javascript  #reactjs

  • Thunks in Redux: The BasicsWhat Thunks Are, What They Solve, Other OptionsThis article was born as a gist for React Redux beginners, intended to demystify what thunks are and the motivation for using them.Redux was created by Dan Abramov for a talk.
  • It provides a predictable approach to managing state that benefits from immutability, keeps business logic contained, acts as the single source of truth, and has a very small API.The synchronous and pure flow of data through Redux’s components is well-defined with distinct, simple roles.
  • Notice how a thunk (the function returned from thunkedYell(…)) requires an extra invocation before the work is executed:Here the potential work involves a side effect (logging), but thunks can also wrap calculations that might be slow, or even unending.
  • In any case, other code can subsequently decide whether to actually run the thunk:Aside: LazinessLazy languages like Haskell treat function arguments as thunks automatically, allowing for “infinite” computed-on-demand lists and clever compiler optimizations.
  • Thunks in React  ReduxIn React / Redux, thunks enable us to avoid directly causing side effects in our actions, action creators, or components.

For React & Redux beginners, intended to demystify thunks and the motivation for using them.
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Redux unit testing with Jest – Ben Garrison – Medium

Redux unit testing with Jest  #react #facebook #redux #jest #javascript #reactjs

  • We are going to begin with testing a very simple Action creator.
  • If you are not familiar with the difference between Actions and Action creators, read this.actions.jsHere is an actionsJS file with a single const SET_SELECTED_ACCT and and Action Creator: setSelectedAccount().
  • This is the Action creator that we will be testing.actions.jstest.jsThis is our test file.
  • We import everything from our actions.js file, set a fake accountNumber to test with and then begin our test.
  • Line 5 and 6 describe our test(you could put multiple it tests inside of a describe), line 8 begins our mocked expected response and line 12 executes our action and uses a toEqual matcher to make the comparison of received vs expected.Your terminal will output something like the following upon success, if errors there will be context for the failure in the terminal.watch options results

If you are bootstrapping your react apps with create-react-app you may be aware that Jest is now baked in. Jest is yet another FB creation that aims to simplify writing javascript unit tests. It’s…
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Redux CRUD management. work in progress… #reactjs #React #Redux #reduce #npm #javascript #es6

  • Each method is an action creator in fact, so you need to dispatch it with bind or directly.
  • An endpoint base URL, uses for generating methods URLs

    A method config for receiving of list of records

    Every predefined method has following options.

  • So the placeholder will be replaced with a matched property from your data, or to ID you passed as payload if the placeholder is

    When this property is true, CRUD uses payload passed to a method instead of API response.

  • May be used to dispatch some action before API call

    May be used to dispatch some action after API response

    As mentioned above every method is an action creator.

  • You can even replace a predefined method if you want, you only need to call CRUD actions manually.

Contribute to redux-CRUD development by creating an account on GitHub.
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#reactjs #React #Redux #reduce #npm #javascript #es6”

💥 Just released some optimizations to react-localize-redux. mmmmjoy 💥 #reactjs #Redux

💥 Just released some optimizations to react-localize-redux. mmmmjoy 💥 #reactjs #Redux

  • Typically you will store your translation data in json files, but the data can also be a vanilla JS object.
  • Once your translation data is in the correct format use the addTranslation action creator.
  • A selector that takes your redux and returns the raw translation data.
  • Redux action creator to set which languages you are supporting in your translations.
  • Redux action creator to add new translation data to your redux store.

Dead simple localization for your React/Redux components
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Power of #TypeScript for #React part 3 is ready 🚀 Today looking at Actions #JavaScript…

  • Actions are a really helpful way to create separation between the different layers of an application, because they are not tightly coupled each layer can be built and tested in pieces.
  • It does bring it’s challenges however, whilst the code is loosely coupled, all areas of the code which interact with the action need to have the same expectation of it’s structure.
  • At Seccl all our actions follow the same basic structure and TypeScript allows us to define what that is by using an .
  • So now that we know the flavours, let’s look at an example of our action interface in the wild.
  • What we will create is an interface which describes the called and an action creator which builds the action.

Frontend leadership, Frontend architecture, HTML(5), JavaScript (OOJS, ES6, TypeScript), CSS (BEM, Less, SASS, Stylus), Testable Code (Mocha, Sinon, Chai, Karma), NodeJs (Express, Mongoose) , Cloud Applications (Heroku, S3, Azure)
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Redux for state management in large web apps

How we use the Redux + React architecture in Mapbox Studio   #redux #reactjs

  • Our Redux architecture boils down to three highly patterned function types: reducers, action creators, and selectors.
  • Slice reducers interpret actions to make changes to specific sub-stores within the single Redux store

    Each slice reducer ends up looking something like this (using the stylesheet sub-store as an example):

    This slice reducer pattern organizes both our code and our thinking.

  • Studio’s React components invoke action creators to trigger changes to the application state, each change represented by an action.
  • To manage asynchronous actions, we use redux-thunk, Redux middleware that allows your action creators to return functions, not just action objects.
  • Our Redux architecture shows how a set of simple concepts — stores, reducers, action creators, and selectors — can effectively organize large applications.

Building a state management system around Redux has allowed us to keep the complex Mapbox Studio (our version of Photoshop for maps) codebase manageable and testable. We’ve used Redux to establish interlocking systems defined by clear, scoped responsibilities and repeatable patterns. We impose restrictions on what code we put where to to make the codebase as a whole more organized, predictable, legible, and testable. These patterns also allow us to increase the quantity of code as the application grows without adding complexity to the architecture. (For those new to Redux, this is a must read 101).
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Scaling your Redux App with ducks – freeCodeCamp

Scaling your Redux App with ducks:  by @alexnmoldovan #ReactJS #Redux #JavaScript

  • A single flow through your app will probably require files from all folders.
  • Selector functions take a slice of the application state and return some data based on that.
  • The file specifies what gets exported from the duck folder.
  • You end up with a folder common or shared, because you want to reuse code across many features in your app.
  • The solution was to split each feature into a duck folder.

How does your front-end application scale? How do you make sure that the code you’re writing is maintainable 6 months from now? Redux took the world of front-end development by storm in 2015 and…
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