Constantin Tews CaptnCodr

General Stuff 🤹‍♀️🍲🐤🥗

Practices-slash-Code Architecture 🏗🗽🛕🧱

Railway Oriented Programming and F# Result

Full source: https://gist.github.com/mrange/aa9e0898492b6d384dd839bc4a2f96a1

Option<_> is great for ROP (Railway Oriented Programming) but we get no info on what went wrong (the failure value is None which carries no info).

With the introduction F# 4.1 we got Result<_, _> a "smarter" Option<_> as it allows us to pass a failure value.

However, when one inspects the signature of Result.bind one sees a potential issue for ROP:

People

`:bowtie:`	😄 `:smile:`	😆 `:laughing:`
😊 `:blush:`	😃 `:smiley:`	☺️ `:relaxed:`
😏 `:smirk:`	😍 `:heart_eyes:`	😘 `:kissing_heart:`
😚 `:kissing_closed_eyes:`	😳 `:flushed:`	😌 `:relieved:`
😆 `:satisfied:`	😁 `:grin:`	😉 `:wink:`
😜 `:stuck_out_tongue_winking_eye:`	😝 `:stuck_out_tongue_closed_eyes:`	😀 `:grinning:`
😗 `:kissing:`	😙 `:kissing_smiling_eyes:`	😛 `:stuck_out_tongue:`

-# Remove all docker images and containers
-docker stop $(docker ps -a -q) && docker rm $(docker ps -a -q) && docker rmi $(docker images -q)
-docker build -t friendlyname .  # Create image using this directory's Dockerfile
-docker run -p 4000:80 friendlyname  # Run "friendlyname" mapping port 4000 to 80
-docker run -d -p 4000:80 friendlyname         # Same thing, but in detached mode
-docker ps                                 # See a list of all running containers
-docker stop <hash>                     # Gracefully stop the specified container
-docker ps -a           # See a list of all containers, even the ones not running
-docker kill <hash>                   # Force shutdown of the specified container