Gain insights into building applications using Rails Webpacker, Webpack, and TypeScript. Explore Stimulus, React, state management, and communication with servers for richer interactions.

railspostgresssl.tar.gz

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introduction/01_testing

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In this course, you will learn to build a fully-functional application with Rails Webpacker, Webpack, and TypeScript.

To kick things off, you’ll walk through the basics of getting Rails set up to use Webpacker which will serve JavaScript and CSS to the browser. You’ll then get acquainted with Stimulus and React which will help with creating richer interactions.

In the latter half, you’ll work with TypeScript and set up communication between a server. Beyond that, you’ll work through managing state in your Stimulus code, as well as how to test and troubleshoot your application.

By the end of this course, you will be well equipped to create larger, more complex applications that make use of modern tools.

Modern Front-end Development for Rails

In Typescript, you _must_ define the type of a variable.

In Typescript, you must define the type of a variable.

Is this a valid variable definition in Typescript: `let z: undefined = null`?

Is this a valid variable definition in Typescript: <code>let z: undefined = null</code>?

Which of the following is invalid Typescript?

Which of the following is invalid Typescript?

`function myFunc(list: AList<MyType>): MyType`

Which of the following is the correct way to define a generic Typescript function that takes a generic list as input?

Which of the following is the correct way to define a generic Typescript function that takes a generic list as input?

Will the following throw an error?

```typescript
let myTuple: [string, number, string] = ["Jennifer", 8, "Lee"]
console.log(myTuple[3])
```

Will the following throw an error?
<pre><code class="language-typescript">let myTuple: [string, number, string] = [&quot;Jennifer&quot;, 8, &quot;Lee&quot;]
console.log(myTuple[3])
</code></pre>

Typescript is a ______ typed language.

Javascript is a ______ typed language.

Will the following code throw an error?
```typescript
let x = "hello world!"
x = 10

Will the following code throw an error?
<pre><code class="language-typescript">let x = &quot;hello world!&quot;
x = 10</code></pre>

What would be the result of the following in Typescript?
```typescript
["5", "10"] + "11"
```

What would be the result of the following in Typescript?
<pre><code class="language-typescript">[&quot;5&quot;, &quot;10&quot;] + &quot;11&quot;
</code></pre>

Will the following Typescript code throw an error?
~~~typescript
function addThings(a: number, b: number) { return a + b }

let result: string = addThings(2, 3)
~~~

Will the following Typescript code throw an error?
<pre><code class="language-typescript">function addThings(a: number, b: number) { return a + b }

let result: string = addThings(2, 3)
</code></pre>

Test your Typescript skills in this lesson!

Getting Started

Client-side Rails

Stimulus

React

Cascading Style Sheets

TypeScript

Webpack

Webpacker

Talking to the Server

Managing State in Stimulus Code

Managing State in React

Using Redux to Manage State

Validating Code with Advanced TypeScript

Testing with Cypress

More Testing and Troubleshooting Basics

Appendix

Quiz Yourself on TypeScript