Comment by jasonthorsness

This is great. I've worked on production .NET services and we often had to avoid LINQ in hot paths because of the allocations. Reimplementing functions with for-loops and other structures was time-consuming and error-prone compared to LINQ method chaining. Chaining LINQ methods is extremely powerful; like filter, map, and reduce in JS but with a bunch of other operators and optimizations. I wish more languages had something like it.