Get random line (optimized)

1. Automate Community
2. Tutorials & Examples

Shows how to get a random line of text from a file, without shuffle()

Tips:
- Only use `split` when the flow reads or re-reads a file.
NEVER use `split` repeatedly on the same text, save its output to a variable, to avoid extra processing.

- Don't repeatedly read a file if it hasn't been modified, only read when the file gets updated.

- Remember that `split` assumes `"\n"` is a delimiter, not a terminator. If \n is used to end every line (including EOF), the returned array will have an empty string at the end.

LICENSE: https://unlicense.org