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What are Props and How Are They Passed?

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ReactJS: Zero to Hero
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DifficultyBeginner
Duration14m
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Description

This module looks at static versions in React, Props, and Mock Components to use when testing an application.

Learning Objectives 

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

  • How to be able to build a static version of an application 
  • How to use Props in components 
  • How to be able to test Component snapshots and Components with props 
  • How to be able to Mock components when testing 

Intended Audience  

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

Prerequisites of the Course 

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. 

Feedback 

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

Transcript

What are props and how are the passed? According to the documentation, props are a way of passing data from parent to child. Props create a one-way communication channel for data that allows it flow from the top or parent component to the bottom or child components. An important concept to understand, is that once the value of props is set, they are immutable within the component. The only way to change the props values in a component is to get it re-rendered by a parent with the new values for props. Components get their props from this point of render. You can see here that the component called componentWithProps, is being given a prop called headerText, that has a value of header text from header text prop. This value will be available inside the componentWithProps component and can be used in any display logic or as part of the return mark up. The value supplied as a prop need not be primitive data like a string, it can be any type of data, included objects, arrays and functions. You can supply them as JavaScript expressions inside curly braces to do this. You can see examples of these in the code. Just so you know, I could've chosen any name for a prop, it's good practice to call them something useful.

Lectures

About the Author
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An outstanding trainer in software development with more than 15 years experience as a Corporate and Apprentice Trainer, ICT Teacher and Head of Department, with a passion for technology and its uses. Continuing to develop existing and new skills and courses, primarily in web design using PHP, JavaScript, HTML, CSS and SQL but also OOP (Java), programming foundations (Using Python), DevOps (Git, CI/CD, etc) and Agile/Scrum. Practically minded, a quick learner and a problem solver with an attention to detail to ensure high quality outcomes.

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