new tasks

Task/Arrays/Clojure/arrays.clj

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+;clojure is a language built with immutable/persistent data structures. there is no concept of changing what a vector/list
+;is, instead clojure creates a new array with an added value using (conj...)
+;in the example below the my-list does not change.
+
+
+user=> (def my-list (list 1 2 3 4 5))
+
+user=> my-list
+(1 2 3 4 5)
+
+user=> (first my-list)
+1
+
+user=> (nth my-list 3)
+4
+
+user=> (conj my-list 100) ;adding to a list always adds to the head of the list
+(100 1 2 3 4 5)
+
+user=> my-list ;it is impossible to change the list pointed to by my-list
+(1 2 3 4 5)
+
+user=> (def my-new-list (conj my-list 100))
+
+user=> my-new-list
+(100 1 2 3 4 5)
+
+user=> (cons 200 my-new-list) ;(cons makes a new list, (conj will make a new object of the same type as the one it is given
+(200 100 1 2 3 4 5)
+
+user=> (def my-vec [1 2 3 4 5 6])
+
+user=> (conj my-vec 300) ;adding to a vector always adds to the end of the vector
+[1 2 3 4 5 6 300]