Скачать или смотреть Two Array Elements Closest in Value

"Write a method that takes an array of integers and returns the two numbers that are closest together in value."

Problem from Launch School, RB109 Interview Practice Problem 4.

EDIT: I made a syntax error at 47:00 with the callback function being passed to sort; it needs an explicit return statement or needs to be on a single line, sans brackets {}.

00:00 understanding the problem
14:49 identifying subproblems
15:47 working through some test cases
18:18 writing initial pseudo code algorithm
21:56 checking something in the repl
26:40 test driving pseudo code with an example test case
30:35 writing first line of code
37:52 massive brain fart
44:17 encountered bug
48:07 a working solution