30 Jan

How to hire a Redux Developer in 2018

If you want to hire a Redux developer, it can’t just be anyone. Redux isn’t a traditional library or framework, but instead is a predictable state container for JavaScript apps. Essentially, Redux works to help developers write applications that behave consistently.

Additionally, if you hire a Redux developer, they can more easily build applications that run in different environments, such as client, server, and native environments. Applications are also more simple to test when using this library.

Redux can be used with any view library, such as React, is very small, and has features like live code editing with a time-traveling debugger for your Redux developer to use. This library isn’t necessary for all websites or applications. Instead, it is typically only useful for those who are struggling with managing their application state.

For example, if you have a React developer, this UI library already has its state management system. Because of this, Redux advises its users to first understand all of the capabilities of React’s built-in system before attempting to work with React.

In fact, only once your application becomes too complex for these built-in systems should you contemplate making the switch. Because typically only complex applications benefit from using this environment, you need to be sure that the Redux developer you hire is truly an expert to navigate both this library and the complex state of the application.

Otherwise, your software engineer could get lost in the complexity that Redux seeks to abstract.

Why Hire a Redux Developer

As mentioned, Redux should be used when the application state becomes too complicated to handle easily. Along with this, there are many benefits.

Organization

When using Redux, there’s always one source of truth. This means that your Redux developer does not have any confusion about how they can sync the current state with other sections of the application and actions.

Additionally, this library gives you a predictable outcome and strict organizational structure, making code easier to maintain, especially when you have a large team working on the same project.

Large Community

There’s a lot to be said for the community related to any library or framework, especially when it’s open-source like Redux. It is easy to find help with tough bugs and questions, more tools, boilerplates, and plenty of tutorials.

If your developer wants to have a look around, they can check out a very large GitHub repo with plenty of Redux examples and middlewares.

Developer Tools and Simple Testing

Redux comes with a lot of developer tools that greatly assist can greatly assist your coder. For example, developers are able to track the app in real time, following all actions and state changes as they happen.

Additionally, the code is very easily testable because, if you hire a Redux developer who is well versed in the library, the code should typically be small, isolated functions that are a tester’s dream.

Not Only With React

Although Redux and React are often used together, Redux can actually be used as a data store for any UI layer. This includes AngularJS, Backbone.js, and more. However, their site states that “it is most useful when combined with a declarative view implementation that can infer the UI updates from the state changes, such as React or one of the similar libraries available.”

A problem can come in if you hire a Redux developer who wants to combine Redux and React, but isn’t truly an expert in both. Essentially, your developer needs to know very well if this library is necessary, and then how to properly implement it.

Best Redux Interview Questions of 2017

Now that you understand more about why you’d want to hire a Redux developer, it’s time to learn what you should ask them in the interview to find out if they’re a true expert. If you want to bypass the hard work, let us find you a fully vetted, guaranteed expert as your new Redux developer.

Explain what ‘actions’ are in Redux

Simply put, actions are events. Actions work by sending data from user interaction, API calls or other internal events, and form submission, to the store. One thing your potential employee certainly needs to mention is that these are the only possible source of information for the store. You send them to the store with the method store.dispach().

Redux documentation gives a simple example of an action which represents adding a new todo item:

Const ADD_TODO = ‘ADD_TODO’

{

type: ADD_TODO,

text: ‘Build my first Redux app’

}

All actions are plain JavaScript objects and need to have a type property. This property should indicate the type of action being performed. Usually, you define the type as string constants, although your developer could consider moving them to their own module once the app is large enough.

Let’s take a look at one more example where we can also show a function and a call to the action:

{

type: LOGIN_FORM_SUBMIT,

payload: {username: ‘alex’, password: ‘123456’}

}

Actions are just created with ‘action creators,’ which are simply functions that return the actions.

function authUser(form) {

    return {

        type: LOGIN_FORM_SUBMIT,

        payload: form

    }

}

Then, to call the action somewhere in the app, you simply use the dispatch method:

dispatch(authUser(form));

What are ‘reducers’ used for in Redux?

Reducers specify how the application’s state changes in response to actions. Before you hire a Redux developer, you need to be sure that they can explain that the entirety of the application state is stored as a single object in Redux. Understanding the application state is vital, particularly for using this library.

The documentation gives us an example of storing the currently selected visibility filter and the actual list of todos for a todo app. Even if your developer has to store both data and some UI state in the state tree, they should make every effort to keep the data separate from the UI state.

{

 visibilityFilter: ‘SHOW_ALL’,

 todos: [

   {

     text: ‘Consider using Redux’,

     Completed: true,

   },

   {

     text: ‘Keep all state in a single tree’,

     completed: false

   }

 ]

}

Tell me the responsibility of the Store in Redux and give an example of how to create it

You need to confirm that your potential Redux developer knows all of the essentials of this library. In order to explain the store, they must first understand both actions and reducers.

The Store brings the reducers and actions together. It accomplishes the following tasks, as noted in the Redux documentation:

  • Holds application state
  • Allows access to state via getState()
  • Allows state to be updated via dispatch(action)
  • Registers listeners via subscribe(listener)
  • Handles unregistering of listeners via the function returned by subscribe(listener)

Your Redux developer should know that instead of splitting data handling logic by using many stores, they should use a reducer composition instead; there is only one store in a Redux application.

Here’s an example of how to create a store importing and then passing the previous example of combineReducers():

import {createStore} from ‘redux’

import todoApp from ‘./reducers’

let store = createStore(todoApp)

Another way to accomplish this is by specifying “the initial state as the second argument to createStore(). This is useful for hydrating the state of the client to match the state of a Redux application running on the server.”

let store = createStore(todoApp, window.STATE_FROM_SERVER)

Hire a Redux developer without all the work

If you want to hire a Redux developer who is heavily vetted and proven to be one of the best from around the world, let us find one for you. Contact us to bypass searching for and interviewing a candidate all on your own.

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