https://blog.leavitt.dev/tags/functional-programming/ Recent content in Functional-Programming on Corey Leavitt Hugo en-us Fri, 31 Jul 2026 00:00:00 +0000 https://blog.leavitt.dev/posts/presence-lock-functional-core/ Fri, 31 Jul 2026 00:00:00 +0000 https://blog.leavitt.dev/posts/presence-lock-functional-core/ PresenceLock locks your Windows session when you step away from the webcam. Twice it silently stopped locking while reporting that it was watching. Both bugs were caught, and both fixes were possible, because the decision to lock is a pure F# function with no clock and no I/O.