Ruby 3.1: guide with Memoization in Recursive Method Causing advanced patterns
I'm working on a project and hit a roadblock. I'm working on a personal project and I need some guidance on I'm integrating two systems and I'm sure I'm missing something obvious here, but I've been struggling with this for a few days now and could really use some help. I'm working with a strange scenario with memoization in a recursive method in Ruby 3.1. The method is intended to calculate the Fibonacci sequence. However, I'm seeing unexpected values being returned, which I suspect is due to how I'm caching results. Here's the code I've written: ```ruby class Fibonacci def initialize @memo = {} end def calculate(n) return @memo[n] if @memo.key?(n) return n if n <= 1 @memo[n] = calculate(n - 1) + calculate(n - 2) end end fib = Fibonacci.new puts fib.calculate(10) # Expected output: 55 puts fib.calculate(11) # Expected output: 89 ``` The first call to `calculate(10)` works as expected, returning `55`. However, when I call `calculate(11)`, it returns `55` again instead of the expected `89`. I suspect that the memoization might not be working correctly after the first call. I've also tried clearing the `@memo` instance variable between calls, but that leads to a performance hit because it recalculates everything from scratch. Is there a better way to handle memoization in this scenario? What am I missing in my implementation that's causing this unexpected behavior? Any ideas what could be causing this? How would you solve this? This is happening in both development and production on Linux. Is there a simpler solution I'm overlooking? I'm working on a web app that needs to handle this. Any pointers in the right direction? This is happening in both development and production on Windows 10. Cheers for any assistance!