(to be clear, lambdas aren't necessary for this pattern to work in Rust, just that the stdlib has generic iterator adapters that are created using lambdas letti

(to be clear, lambdas aren't necessary for this pattern to work in Rust, just that the stdlib has generic iterator adapters that are created using lambdas letting you do a myriad of things with a single function. Rust lambdas (closures) are on the stack, so this usually gets optimized down to a for loop or something)