# JavaScript intro

## Introduction
I created an introduction to JavaScript video at [https://youtu.be/33Xmn5rnisc](https://youtu.be/33Xmn5rnisc).

In the video I walked thru the [a_js_intro.js](./a_js_intro.js) file.

The `a_js_intro.js` script ends up covering a lot of topics!
- submenu : `setHeader`, `addItem`, `show`
- keyboard  : `text` (first param is # of bytes to allocate, including null terminator)
- storage : `exists`
- usbdisk : `start`, `wasEjected`, `stop`
- textbox : `setConfig`, `emptyText`, `addText`, `show`, `isOpen`
- gpio : `init`, `read`
- badusb : `setup`, `isConnected`, `press`, `println`, `quit`
- subghz : `transmitFile`
- `let`, `=` (assignment), `for` (loop)
- `require`, `print`, `delay`, `parse_int`, `__dirpath`
- Strings, numbers, booleans
- Arrays, `.length`
- `+` (adding), `i++` (increment by 1), `!`  (not)
- `if`, `else if`, `===` (compare equal), `!==` (compare not equal)
- calling functions, defining functions, `return`

At the end of the video I ran [widget.js](./widget.js) to summarize what we learned.