Io (programming language)

Io is a small, prototype-based, object-oriented programming language created by Steve Dekorte around 2002, in which every value is an object and new objects are created by cloning an existing prototype object rather than instantiating a class, a design directly inspired by the earlier languages Self and Smalltalk. Io features homoiconic, message-passing syntax in which even control structures such as if statements are ordinary messages sent to objects, along with built-in support for actor-based concurrency, coroutines and differential inheritance for memory-efficient object cloning.