I share the same regret. In fact, by far my biggest regret in my career was missing an opportunity in 2008 to switch to F#. The portfolio management team I was

I share the same regret. In fact, by far my biggest regret in my career was missing an opportunity in 2008 to switch to F#. The portfolio management team I was with departed a large hedge fund to start our own. I knew I had 8-10 months before we started trading again. It was every programmer's dream: hit the pause button and get a chance to leisurely refactor everything you've never had time for. Even enough time to completely change tool sets. I remember discovering F# during this period and it was as though Don Syme (the F# BDFL) had listened to all my complaints about C# & Matlab and built a language specifically for me. Ultimately, I chickened out. I was afraid Microsoft would eventually Foxpro F#; or I'd hire people who'd tell the CEO of our firm that I was nuts and had built all our systems in an obscure language. By late 2012 the ecosystem had matured tremendously and I finally switched to F#. I really wish I had those four years back. F# would have saved me a ton of while-on-vacation troubleshooting from 2008 to 2012.