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---
title: Cache
layout: gem-single
name: dry-core
---
Allows you to cache call results that are solely determined by arguments.
```ruby
require 'dry/core/cache'
class Foo
extend Dry::Core::Cache
attr_reader :source
def initialize(source)
@source = source
end
def heavy_computation(arg1, arg2)
fetch_or_store(source, arg1, arg2) { source ^ arg1 ^ arg2 }
end
end
```
### Note
Beware Proc instance hashes are not equal, i.e. `-> { 1 }.hash != -> { 1 }.hash`.
This means you shouldn't pass Procs in args unless you're sure they are always the same instances, otherwise you introduce a memory leak
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