Docs for Creating Receipt

[Felicious]

Why am I doing this?
To be frank, this project was a humbling experience, from start to finish. I learned and implemented a lot of things about front-end development, web-server communication, and APIs for the first time and I'm not confident that I can look back at my code a year from now and understand everything.

Thus, clear and concise documentation is a must. Here I will enumerate the many things I struggled with, so that I can ensure to explain them clearly in the docs. I may have struggled with and pestered Derrick for guidance on many things on this ongoing list, but I'll have gained new knowledge in the future. And that excites me,

List of things to Document

1. List of most commonly used or useful Google Sheets Built-in Functions

• this item has been partially documented here

2. How to use outside functions inside a template

• There is an example of this in Apps Script's documentation but I didn't understand it very well. Specifically, I didn't understand how data inside the template knew what data[i][j] was.

3. A recap of the callback functions used

• Sometimes, I get confused about what gets passed in and how the value changes with every iteration

4. Mention the regular expressions used to parse strings

• this was very useful and I have a hard time remembering to use them when I parse strings