A software engineer looking to learn something new will typically first check how many available jobs there are related to the subject at hand, simply to make sure he or she is valuable for future employers - And we all know that the most popular programming languages includes JavaScript, Java, C#, Python and TypeScript. However, what is the least popular programming language, still in actual use, and why should you even care?
Ignoring the funny prototype OOP parts of JavaScript, all of the above programming languages are more or less copies of each other, without much difference semantically. Sure, there are a few noteworthy exceptions, such as SQL and F#, but almost all programming languages at the top of the popularity index are more or less rip offs, copying and pasting features from each other. This creates a problem for you individually, and also for the world at large, which I refer to as local evolutionary optimums. The problem is best explained as follows ...