I work at a small company that uses very outdated coding approaches for their solutions.

About a year ago I went through our main application to improve performance and found quite a few areas that I could tackle such as using a dictionary data structure in place of (many) foreach loops that required to pull out a single object.

That specific change yielded a lot of improvement (you can only imagine) and the other developers wanted to learn the ways of dictionaries (because it was so revolutionary and new to them). I showed them many examples so that they could better understand this data structure.

Fast forward to a few months later, saw one of my coworker's code and noticed that they were using a dictionary... And iterating through each kvp similar to a foreach..... Wtf?!

P.S. that person's salary is much higher than mine :(

First time rant. Thanks for listening!