closures

Ruby's closures—blocks, procs, lambdas—enable functional programming patterns. Blocks are anonymous code chunks passed to methods. Procs are objects wrapping blocks, callable with call. Lambdas are stricter procs—check argument count and return differ

Closures allow functions to access variables from outer scopes even after outer function returns. I create closures when inner functions reference outer function variables. Lexical scope means functions look up variables where they're defined, not whe