Clojure: Immutability at the Language Level | Developer.com
Because vectors are indexed, they can be efficiently walked in either direction, left to right or right to left. The seq and rseq functions return sequences that do exactly that: (seq some-chars) ;=> (A B C D E F G H I J) (rseq some-chars) ;=> (J I H G F E D C B A) Any item in a vector can be “changed” using the assoc function. Because vectors are immutable, the item isn’t actually changed — assoc
Clojure's Approach to Polymorphism: Method Dispatch | Developer.com
The word polymorphism derives from Greek where poly means many and morph means form. In programming languages, polymorphism is the idea that values of different data-types can be treated in “the same” way. Often, this is manifested via class inheritance where classes in a hierarchy can have methods of the same name. When such a method is called on an object, the correct code is executed at runtime
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