Learning Redux-Saga #javascript #reactjs #redux #redux-saga

Learning Redux-Saga  #javascript #reactjs #redux #redux-saga

  • Redux-saga is a Redux middleware to handle side effects, mainly the asynchronous actions which change the state.
  • A saga is a generator function that can run asynchronous actions indefinitely like a thread in the application.
  • On the other hand, Redux-saga uses the generators which can pause, resume, and interact with the asynchronous actions by using generators.
  • Each of the following functions will return a saga effect which is an object containing instructions of what/how the action should be executed by the saga middleware.
  • takeEvery – – Resolve the effect with the result of each time that the action is received.

Redux-saga is a Redux middleware to handle side effects, mainly the asynchronous actions which change the state. A saga is a generator function that can run asynchronous actions indefinitely like a thread in the application.
Continue reading “Learning Redux-Saga #javascript #reactjs #redux #redux-saga”

Learning Redux-Saga #javascript #reactjs #redux #redux-saga

Learning Redux-Saga  #javascript #reactjs #redux #redux-saga

  • Redux-saga is a Redux middleware to handle side effects, mainly the asynchronous actions which change the state.
  • A saga is a generator function that can run asynchronous actions indefinitely like a thread in the application.
  • On the other hand, Redux-saga uses the generators which can pause, resume, and interact with the asynchronous actions by using generators.
  • Each of the following functions will return a saga effect which is an object containing instructions of what/how the action should be executed by the saga middleware.
  • takeEvery – – Resolve the effect with the result of each time that the action is received.

Redux-saga is a Redux middleware to handle side effects, mainly the asynchronous actions which change the state. A saga is a generator function that can run asynchronous actions indefinitely like a thread in the application.
Continue reading “Learning Redux-Saga #javascript #reactjs #redux #redux-saga”

How I test redux-saga – codeburst

  • How I test redux-sagaI’m a fan of redux saga (although I’ve been keeping an eye on redux-observable too).
  • I particularly like having all async logic in one place, making it easily testable and having powerful async control flows available where necessary.Because the saga effects only construct a special object that is consumed and executed by the middleware (aka they dont do much!)
  • , it is really easy to test your sagas with no mocking required.Few points of note:The mock result of the api (true or false) is injected into the subsequent next() call after the api call.
  • clone()” to test different control flow branches

I particularly like having all async logic in one place, making it easily testable and having powerful async control flows available where necessary. Because the saga effects only construct a special…
Continue reading “How I test redux-saga – codeburst”

Passing Functions to Components

  • Pass event handlers and other functions as props to child components: – – If you need to have access to the parent component in the handler, you also need to bind the function to the component instance (see below).
  • There are several ways to make sure functions have access to component attributes like and , depending on which syntax and build steps you are using.
  • In JavaScript, these two code snippets are not equivalent: – – Binding methods helps ensure that the second snippet works the same way as the first one.
  • Make sure you aren’t calling the function when you pass it to the component: – – Instead, pass the function itself (without parens): – – You can use an arrow function to wrap around an event handler and pass parameters: – – This is equivalent to calling : – -…
  • is a way of queuing a function to be executed in the browser at the optimal time for rendering performance.

If you need to have access to the parent component in the handler, you also need to bind the function to the component instance (see below).
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How to Lazy Load features using React and Webpack – codeburst

How to Lazy Load features using #ReactJS and #Webpack:  by @notgiorgi

  • We don’t want to load our app’s whole component library when user enters our site.
  • We need to load components on demand, and after initial load, cache them in the memory for further use.Also we want lazy loading logic to be separated from the component implementations.We can solve this problem using Webpack import functions and Higher order components.Our HOC takes two arguments, second is the component which will be shown while component is loading, because we don’t want our users to be looking at the blank screen.First argument is the getComponent function, this is where we call Webpack import:One might ask why we don’t pass the path directly to the HOC.
  • E.g. if we do something like this: Webpack will bundle all the files in the .
  • If we pass the whole string directly import(‘.
  • But we cannot do this: path = import(path), because Webpack won’t know which files to consider, it won’t have any pattern to match files against.So our HOC, calls import before it mounts and displays the spinner while component is being downloaded.This way we can easily convert any statically imported component into lazy-loadable one.

In the modern web, every kilobyte matters. We don’t want to load our app’s whole component library when user enters our site. We need to load components on demand, and after initial load, cache them…
Continue reading “How to Lazy Load features using React and Webpack – codeburst”

How to Lazy Load features using React and Webpack – codeburst

  • We don’t want to load our app’s whole component library when user enters our site.
  • We need to load components on demand, and after initial load, cache them in the memory for further use.Also we want lazy loading logic to be separated from the component implementations.We can solve this problem using Webpack import functions and Higher order components.Our HOC takes two arguments, second is the component which will be shown while component is loading, because we don’t want our users to be looking at the blank screen.First argument is the getComponent function, this is where we call Webpack import:One might ask why we don’t pass the path directly to the HOC.
  • E.g. if we do something like this: Webpack will bundle all the files in the .
  • If we pass the whole string directly import(‘.
  • But we cannot do this: path = import(path), because Webpack won’t know which files to consider, it won’t have any pattern to match files against.So our HOC, calls import before it mounts and displays the spinner while component is being downloaded.This way we can easily convert any statically imported component into lazy-loadable one.

In the modern web, every kilobyte matters. We don’t want to load our app’s whole component library when user enters our site. We need to load components on demand, and after initial load, cache them…
Continue reading “How to Lazy Load features using React and Webpack – codeburst”

JavaScript programmers need to learn Clojure – Reactive Conf

#JavaScript programmers NEED to learn #Clojure:  #ReactJS

  • And later he gave one of the most exciting talks of the last year’s ReactiveConf:Eventually, since we are huge fans of Clojure, we joined our efforts with EuroClojure and persuaded them to organize their 2016 conference in Bratislava:Clojure has forever changed the JavaScript communityMaybe you’ve never heard about Clojure, but it’s had a huge impact on you how program front-ends regardless.
  • Redux, immutable data, time travel debugging, hot reloading — all of this has been inspired by the Clojure community.Its creator, Rich Hickey, has taught us over the time thatDaniel Higginbotham summarized the key takeaways in The Unofficial Guide to Rich Hickey’s Brain, and I strongly recommend this read for everyone coming to functional programming from the OOP world.Closer look at ClojureNow you’re wondering what makes Clojure so special.Clojure is a dialect of Lisp, and we all know the jokes about Lisp parentheses, don’t we?
  • Even the code is just a huge nested list of lists, which is where the parentheses come from.Extremely simple Clojure exampleThis simplicity makes it easy to write functions that transform and generate the Clojure code.
  • For instance, generators, CSP, destructuring, or pattern matching, are implemented in Clojure as macros.You don’t use classes and objects in Clojure, you work with pure data instead.
  • The ticket will grant you access to all three days of the event.3 days packed with React, Reason, Vue, Angular, Clojure, and moreDon’t forget to follow us on Twitter, Facebook, and Medium for exciting news and announcements.By Samuel Hapák, co-organizer of ReactiveConf

It’s half past noon, and I’m sitting in a nice hummus place in Manhattan. I look anxiously at the big clock on the wall every few seconds because I should be having lunch with David Nolen, my…
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