Actions in Reducers

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This module looks at how to manage state in React. You’ll be looking at state management, context, and reducers.  

Learning Objectives 

The objectives of this module are to provide you with an understanding of: 

  • State Management  
  • Context  
  • How to create and provide context  
  • Reducers  
  • How to provide dispatch 

Intended Audience  

This learning path is aimed at all who wish to learn how to use the ReactJS framework.  


It is essential you understand the face of contemporary web development to attend this course. We insist upon JavaScript experience, along with good HTML and CSS skills. 


We welcome all feedback and suggestions - please contact us at to let us know what you think. 


- [Tutor] If we have a reducer, we need at least one action, perhaps several. Action is usually an argument supplied to a reducer function as an object. Unsurprisingly, it's job is to help the reducer in deciding which execution path to follow to create the new state. An action object usually has at least two properties. The type, this is generally a string that the action is identified by, and the payload. This is the data that has been dispatched as part of the call to update the state. If we're thinking about a reducer for the filter per course is table up, one of the actions we need is to get all of the courses. Another action would be to add a course when the user submits the form, sending data to the server. Because this is all about course's context, we're gonna put the reducer and any of the code we might need in the course's context file we created earlier. If you look on line 15, there's now a courses reducer function. It's not complete as we haven't identified what we'll need to do to return the new state for the actions but it's a start. We haven't mentioned the useReducer hook in React yet.


Introduction to State Management - Context - How to Create and Provide Context - Consume Context - Reducers - The useReducer Hook - Providing Dispatch

About the Author
Learning Paths

Ed is an Outstanding Trainer in Software Development, with a passion for technology and its uses and holding more than 10 years’ experience.

Previous roles have included being a Delivery Manager, Trainer, ICT teacher, and Head of Department. Ed continues to develop existing and new courses, primarily in web design using: PHP, JavaScript, HTML, CSS, SQL, and OOP (Java), Programming Foundations (Python), and DevOps (Git, CI/CD, etc). Ed describes himself as practically minded, a quick learner, and a problem solver who pays great attention to detail. 

Ed’s specialist area is training in Emerging Technologies, within Web Development. Ed mainly delivers courses in JavaScript covering vanilla JS, ES2015+, TypeScript, Angular, and React (the latter is authored by Ed) and has delivered on behalf of Google for PWAs. Ed has also developed a new suite of PHP courses and has extensive experience with HTML/CSS and MySQL. 

Ed is responsible for delivering QA’s Programming Foundations course using the Eclipse IDE. His skillset extends into the DevOps sphere, where he is able to deliver courses based around Agile/Scrum practices, version control, and CI/CD.

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