A fun debugging story from this weekend

Yesterday, as Pokémon TCG World Championships started, we were following the tournament with friends. With 1500+ players, it’s not easy to quickly find the results of specific players from the long lists of results. I decided to build a simple bookmarklet: Define a list of players you want to follow Every time you run the bookmarklet, it will show those players and their most recent win/loss records on an alert box and copy to clipboard. At some point, it suddenly stopped working. It only found one person but nobody else. No matter how I ordered the people in the list, nothing. Even my debug console.logs didn’t show up while syntax errors did (to confirm it was running the newest code). I probably spent a good 15-20 minutes trying to reason why my simple filter and map loops didn’t work. Eventually, I found out that when I was trying to find one player from the list to copy their name, I had accidentally searched in the developer console which filters the output shown. I can’t…