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Python is already used in the back-end of most web-based applications. However, it does not work with the front-end of web browsers in those applications. This is where Transcrypt comes in. Transcrypt can help create more coherent web-based projects where Python is used to write the back-end and front-end. This course is primarily about using a transpiler called Transcrypt. It translates our Python code to JavaScript and then executes that JavaScript, letting us enjoy the neatness of Python with the front-end flexibility of JavaScript.

Using the Python Transcrypt Transpiler for Front-end Coding

**(True or False)** React class components cannot be used with functional components.

(True or False) React class components cannot be used with functional components.

The constructor in a JavaScript React class is used to do which of the following?

The constructor in a JavaScript React class is used to do which of the following?

The `React.useEffect()` hook method replaces which React class component lifecycle
method?

The <code>React.useEffect()</code> hook method replaces which React class component lifecycle
method?

**(True or False)** Python dictionaries are just like JavaScript objects.

(True or False) Python dictionaries are just like JavaScript objects.

**(True or False)** The node `require()` function can be used to import image files.


(True or False) The node <code>require()</code> function can be used to import image files.

```py
const isEmpty = (myValue) => {return myValue === null || myValue === ""}
```

```py
def is_empty(my_value):
    return my_value is None or len(str(my_value)) == 0
```

```py
is_empty = lambda my_value: my_value is None or len(str(my_value)) == 0
```

```py
def is_empty(my_value): return my_value is None or len(str(my_value)) == 0
```

```py
def is_empty(my_value):
    if my_value is None:
        return True
    elif len(str(my_value)) == 0:
        return True
    else:
        return False
```

Which would be considered to be the most Pythonic way to convert the following
JavaScript anonymous function to Python?

Which would be considered to be the most Pythonic way to convert the following
JavaScript anonymous function to Python?

```py
el('button', {'onClick': lambda: handleClick(item)}, "Submit")
```


```
el('button', {'onClick': lambda item: handleClick(item)}, "Submit")
```


```py
el('button', {'onClick': lambda: handleClick(item)}, Submit)
```

```py
el('button', {'onClick': handleClick(item)}, "Submit")
```

Which of the below `createElement()` statements is the correct way to represent the
following JSX expression in Python?
```jsx
<button onClick={() => this.handleClick(item)}>Submit</button>
```

Which of the below <code>createElement()</code> statements is the correct way to represent the
following JSX expression in Python?
<pre><code class="language-jsx">&lt;button onClick={() =&gt; this.handleClick(item)}&gt;Submit&lt;/button&gt;
</code></pre>

Introduction

The Setup

Write a “Hello, World” Application

JavaScript Functions

Sourcemaps

External JavaScript Libraries

Intro to React

React Concepts

Cleaner Code

Managing JavaScript Packages

Package Bundler

Text Input

Lists

Forms

React Components

JavaScript Examples

CSS

Material-UI

Parcel Web Proxy

Asynchronous Requests

React Context Hook

Transcrypt Miscellany

Application Versioning

Google Analytics

Developer Tools

Appendix

Quiz on JavaScript Examples