Jfokus functional groovy

The document discusses functional programming concepts in Groovy including closures, partial evaluation, composition, memoization, and tail calls. It explains that closures in Groovy are functions with an environment that binds free variables, and are not necessarily side effect free. Closures can have parameters with default values defined from right to left. Partial evaluation is achieved through currying closures from left to right or arbitrary indexes. Composition uses the >> and << operators to combine closures from left to right or vice versa. Memoization caches computed values. Tail calls use trampoline() and the @TailRecursive annotation. Iterators, streams using the groovy-stream library, and immutability with the @Immutable