Purely functional digital circuit simulator (SICP 3.3)

I have a copy of SICP, or as it is also known, The Wizard Book . This book is widely praised, but I can&rsquo;t take the time to work my way through all of it. Instead, I&rsquo;m going to occasionally jump into the parts of it that look interesting. Since last week, are in the process of simulating a digital circuit. The reason this is interesting is the solution in SICP uses hidden mutable state…