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CHANGING REACT ROUTE PROGRAMMATICALLY WITH REDUX-SAGA Changing React Route Programmatically with Redux-Saga. Sometimes in a web app you've got a workflow that calls for a route change after a user action. For example, suppose the user has to complete a form and click a button. The data is sent to the server via AJAX and then you'd like to redirect the user to a another page upon successful HAS REDUX-SAGA GOT YOU STUCK IN AN INFINITE LOOP? Building asynchronous web applications is complicated. React with Redux is not enough. You need something like Redux-Saga to complete the picture.. I can show you how. Sign up on my email list where I write about Redux-Saga and related web development topics. REDUX-SAGA AND ABORTCONTROLLER FOR TRULY CANCELLABLE API CALLSSEE MOREON DECEMBERSOFT.COM
USING A TIMER IN A REACT COMPONENT Using a Timer in a React Component. Sometimes you might need to write a component that relies on time. Perhaps you need to change some state after a period of time. Or maybe you need to perform a change that repeats on a regular interval. Adding time-based changes to your React components is easy to perform in stateless functional components BACK TO BASICS: RUNNING PROMISES IN SERIAL WITH ARRAY.REDUCE() Back to Basics: Running Promises in Serial with Array.reduce() last updated: Mar 2nd, 2017 HOW TO WRITE UNIT TESTS FOR ASYNCHRONOUS REDUX THUNKS IN Step Five: Run, fix errors, and repeat. Saving your file will kick off a new test run if you've already got Jest running. Otherwise, bring up a terminal window. Press Ctrl backtick in VSCode (or Ctrl Shift backtick for a new terminal window) and run the tests. > npm run test. REDUX HERO PART 5: THE HERO IS TESTED (A FUN INTRODUCTION Most developers agree that automated software testing is an important practice. It proves that code is correct now and that it stays correct in the future as the code evolves. REDUX-THUNK VS. REDUX-SAGA STARTING A REACT/REDUX PROJECT WITH TYPESCRIPT Some developers may choose Flux, MobX, other libraries, or even nothing but pure React. Install react-redux and its TypeScript definitions. npm install --save react-redux @types/react-redux. 8. Run a Test Window. Now you're ready to start playing with the code and learning React/Redux. UNDERSTANDING JAVASCRIPT CLOSURES IN FOR LOOPSSEE MORE ONDECEMBERSOFT.COM
CHANGING REACT ROUTE PROGRAMMATICALLY WITH REDUX-SAGA Changing React Route Programmatically with Redux-Saga. Sometimes in a web app you've got a workflow that calls for a route change after a user action. For example, suppose the user has to complete a form and click a button. The data is sent to the server via AJAX and then you'd like to redirect the user to a another page upon successful HAS REDUX-SAGA GOT YOU STUCK IN AN INFINITE LOOP? Building asynchronous web applications is complicated. React with Redux is not enough. You need something like Redux-Saga to complete the picture.. I can show you how. Sign up on my email list where I write about Redux-Saga and related web development topics. REDUX-SAGA AND ABORTCONTROLLER FOR TRULY CANCELLABLE API CALLSSEE MOREON DECEMBERSOFT.COM
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Using a Layer of Abstraction for Testing Code that Depends on Time. Continuing with this month's theme, Time, I want to share a strategy I've used in the past when I've needed to write unit tests for logic that depends on time, timers, timeouts, etc. REDUX-THUNK VS. REDUX-SAGA But not the same. Redux-Thunk and Redux-Saga differ in a few important ways. But, first, let's cover some background. Redux-thunk and Redux-saga are both middleware libraries for Redux. Redux middleware is code that intercepts actions coming into the store via the dispatch()
USING A LAYER OF ABSTRACTION FOR TESTING CODE THAT DEPENDS Using a Layer of Abstraction for Testing Code that Depends on Time. last updated: Nov 16th, 2020 HOW TO TYPE A KEYED COLLECTION IN TYPESCRIPT How to Type a Keyed Collection in TypeScript. last updated: Oct 23rd,2020
CHANGING REACT ROUTE PROGRAMMATICALLY WITH REDUX-SAGA Changing React Route Programmatically with Redux-Saga. Sometimes in a web app you've got a workflow that calls for a route change after a user action. For example, suppose the user has to complete a form and click a button. The data is sent to the server via AJAX and then you'd like to redirect the user to a another page upon successful UNDERSTANDING JAVASCRIPT CLOSURES IN FOR LOOPS The key difference here is that the function we added is executing immediately. i.e. It's running inside the loop as opposed to after the loop has already completed. The closure is now closing over the parameter to our function, which is effectively fixed to the value it was called with rather than the future value of e. REDUX-SAGA AND ABORTCONTROLLER FOR TRULY CANCELLABLE API CALLS Does your web app use Redux-Saga and the Fetch API to make a lot of repeated or lengthy calls to a particular server? You've probably noticed that Chrome limits concurrent connections to any given host. A SIMPLE NAMING CONVENTION FOR ACTION CREATORS IN REDUX.JS This snippet from the Redux documentation is the action creator for adding a todo to a list. let nextTodoId = 0 export const addTodo = (text) => { return { type: 'ADD_TODO', id: nextTodoId++, text } } In the context of the TodoMVC example application, the ADD_TODO action type and the addTodo () action creator are adequately named becausethe
WHAT IS THE RIGHT WAY TO DO ASYNCHRONOUS OPERATIONS IN REDUX? 1. Must be transpiled down to ES5 via Babel, TypeScript 2.3, etc. Conclusion. So what is the right way to do asynchronous operations in Redux? There really is no right answer for everyone. ERROR: SELECTOR CREATORS EXPECT ALL INPUT-SELECTORS TO BE Error: Selector creators expect all input-selectors to be functions, instead received the following types: Addressing this problem is a nightmare if you don't know what to look for. But lucky for you, I've dealt with this before. I admit I wrote the following code -- well, the names have been changed to protect theinnocent.
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HOW TO WRITE UNIT TESTS FOR ASYNCHRONOUS REDUX THUNKS IN FIVE EASYSTEPS
Suppose we have a basic asynchronous login thunk, such as in the codesnippet below.
LOGINTHUNK.TS
import { Dispatch } from 'redux';import { loginRequest, loginFailure, loginSuccess } from 'actions/sessionActions';import { login } from 'api/api';import { log } from 'util/log';export const loginThunk = (username: string, password: string) => async (dispatch: Dispatch) => {    log.debug(`Login attempt for user ${username}`);    dispatch(loginRequest());    try {        const { userId, sessionId } = await login(username, password);        log.info(`Login succeeded: ${userId} in session ${sessionId}`);        dispatch(loginSuccess({ userId, sessionId }));    }    catch (err) {        log.error(`Login failed: ${err}`);        dispatch(loginFailure(err));    }}; The thunk takes a username and a password; it returns an asynchronous function that takes the Redux store dispatch method. This is the same basic pattern that all redux-thunk thunks have. This might look intimidating to test because of the indirection and async keyword. But I'll show you how you can easily test the behaviour of thunks like this.Read more...
DO YOU NEED REACT HOOKS? How many times have you put your head down to work on a big project and -- in what feels like the blink of an eye -- several months or even years (ouch) pass by and you realize you haven't come up for air. It can be difficult to keep current with the latest developments in the JavaScript (and React) ecosystem. Well... answer me this, busy React developer: * does writing boilerplate code make you afraid of carpal tunnelsyndrome?
* does your heart skip a beat when you think of stateless functionalcomponents?
* have you been too busy to check out new React developments lately? Stop what you're doing _right now_ if you answered 'Yes' to all threequestions!
You need React Hooks in your life.Read more...
WHY IS THIS JAVASCRIPT SO SLOW? There I was... in day two of performance improvements for a tree control in React. (React wasn't the culprit). This particular control does some processing on the incoming data and builds an internal structure and it was _that_ processing that was taking too long. I had already reduced the runtime from "I don't know... it crashes Chrome" to about 30 seconds. Infinitely better but still not even in the ballpark of acceptible. but at least at that point I could get something -- anything -- out of the Performance profiler in Dev Tools. With the help of the profiler, I had made a few more adjustments and had the runtime down to ~12 - 14 seconds. Today, however, the profiler led me to something unexpected.Read more...
REDUX HERO PART 5: THE HERO IS TESTED (A FUN INTRODUCTION TO REDUX-SAGA-TEST-PLAN) Most developers agree that automated software testing is an important practice. It proves that code is correct now and that it stays correct in the future as the code evolves. However, despite this widely-held opinion, there are still lots of developers who aren't testing theirsoftware.
Not knowing what nor how to test are big barriers to getting started -- and that's just with regular code. The barrier feels even bigger for redux-saga code because generator functions can't be tested in the same way as regular functions. This could become a big problem for teams who are increasingly relying on putting complex business logic in sagas without tests. I am going to walk you through some saga unit tests written using a library called redux-saga-test-plan.
We wrote some sagas in the previous article (Part 4)
for a mock RPG. Now let's test them!Read more...
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