implementing Memoization in Ruby 3.1 Leading to Unexpected Caching Behavior
I'm performance testing and I'm working with an odd scenario with memoization in Ruby 3.1, where my method seems to cache unexpected values across instances... Here’s a simplified version of my code: ```ruby class ExpensiveComputation def initialize(value) @value = value end def compute @result ||= expensive_operation end private def expensive_operation sleep(2) # Simulating a time-consuming operation @value * 100 end end ``` When I create two instances of `ExpensiveComputation`, I'm expecting that calling `compute` on each instance would yield different results based on their respective initial values. However, it seems like the memoization is sharing results between instances. ```ruby comp1 = ExpensiveComputation.new(1) comp2 = ExpensiveComputation.new(2) puts comp1.compute # Expected: 100 puts comp2.compute # Expected: 200 ``` Instead, the first call to `compute` works as expected, but the second call results in the same cached value for both instances. The output for `comp2.compute` returns `100`, not `200`, which indicates that the memoization is not working as I intended. I've tried to debug this by checking the instance variables, and they seem to be set correctly. I've also verified that I'm not accidentally sharing state between instances. Is there something specific about how instance variables and memoization work in Ruby that I might be missing? Any insights would be greatly appreciated. Here's how I'm running my Ruby version: ```bash ruby -v # ruby 3.1.0 ``` Am I missing something obvious? For reference, this is a production mobile app.