In my last job I had two realms of development. The first was strictly based on what the company had been doing for years, what we expect new hires to know and

In my last job I had two realms of development. The first was strictly based on what the company had been doing for years, what we expect new hires to know and what we touted as our language of choice. Embedded world that was C. The second realm was languages that I picked purely because they filled a niche better than anything else. Often these were side projects, or tooling, or things that I could sell based on how quickly and efficiently I could get up and running with X language that would save us money even if we eventually had to replace it if no one learned it. I used F# for big data processing because I am an FP guy and they wanted .Net and I could do data manipulation like nobody's business. I used tcl/tk because I needed a super quick and dirty UI for tooling that I could quickly update to add new features. I used Racket when meta programming would hugely benefit me. The problem is that for a lot of our jobs we are stuck with realm 1, the things we can't change. This is the area where we end up pitting languages against each other because they end up used way more than realm 2. You have to push really hard and hope someone listens but more often than not you just keep on doing what you're doing. I worked on a huge JVM based project and even though no one in the company knew Java there was just no selling upper management on using Clojure. FP would have reduced complexity, meta programming and dynamic code generation would have made it much more robust without a lot of effort, but it was just too foreign (or at least not advertised as being used in places well enough), too new, and when you Googled it the "major" issues developers had scared everyone.