Important Clojure concepts

clojure_concepts.txt

* Immutability
  - Persistent data-structures. Once created, cannot be changed.
  - All modifications result in a new data-structure being created.
  - New data-structures are efficiently created from old ones through structural sharing.

* Identity
  - Identity is logical.
  - Changes over time. For example, Kaveri River.

* State
  - Is a snapshot of an identity at a given time. Hence, is immutable.

* Time
  - Time in a system is relative to observable events.
  - Imperative programming languages allow mutable state making concurrent programming difficut.
  - Clojure separates object's state from its identity making it suitable to handle concurrent events.