For some reason, I've never quite understood how this method worked. Something inside my brain didn't quite grasp it, but...with a few (a lot of) console logs I finally got it working how I needed it to and moved on to my next task.
After coming back to the code the next day and reading through what I'd done previously, it just...clicked! I understood how reduce() worked! I finally grasped what it was doing with my data and why it returned the values it did. This is what I'm referring to in the title as the 'oh my god I get it' moment.
I remember having a similar experience when first using GIT and working with branches. I even had it when first learning how to nest rules in SCSS!
I'm really interested to know firstly, if anyone else has experienced these awesome moments during their work, and second, what it was for you that just 'clicked'!