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## Table of Contents
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- [An introduction to React](#an-introduction-to-react)
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- [Recap of the previous session](#recap-of-the-previous-session)
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- [Before getting into React...](#before-getting-into-react)
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- [Manipulating the DOM](#manipulating-the-dom)
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- [Learning React](#learning-react)
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- [Using CodeSandbox](#using-codesandbox)
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- [Exercise](#exercise)
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- [Self-assessment](#self-assessment)
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# An introduction to React
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2020-10-06 11:26:09 +02:00
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## Recap of the previous session
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See previous session
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- Arrow functions
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- Classes
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- `let` and `const`
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- Object and array destructuring
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- Template literals
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2020-07-27 12:43:02 +02:00
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## Before getting into React...
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### Manipulating the DOM
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- https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Client-side_web_APIs/Manipulating_documents
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- https://developer.mozilla.org/en-US/docs/Web/API/Document_Object_Model/Introduction
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## Learning React
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Follow the tutorial: https://reactjs.org/docs/hello-world.html
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We have chosen this tutorial over the "learn by doing" one because it introduces the concepts behind React. It is very well done and very complete.
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2020-10-19 11:13:18 +02:00
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### Using CodeSandbox
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It is a good exercise to start from a Vanilla JS template and setup
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CodeSandbox.
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1. Go to https://codesandbox.io/
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2. Start a Vanilla JS project
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3. Add `react` and `react-dom` dependencies
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4. Add the simplest React app from the tutorial and get it to work!
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2020-10-06 11:26:09 +02:00
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## Exercise
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Use one of our hiring exercises.
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2020-07-27 12:43:02 +02:00
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## Self-assessment
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Basics:
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- What is the difference between elements and components?
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- What is JSX?
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- Is it ok to modify props?
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- How should you modify state?
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- What does "the data flows down" mean?
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- How do you pass arguments to event handlers?
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- How do you put conditionals in JSX?
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- How do you put inline if-else in JSX?
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- How do you prevent a component from rendering?
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- What is the `key` prop?
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- What are controlled and uncontrolled components?
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- What does it mean to "lift state up"?
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- Should you use composition or inheritance with React?
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Advanced:
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