Clojure 中的 sequential collection

Clojure Sequential Collections

Vectors

• are indexed ¹
• are represented with []
• immutability
• add elements at the tail

1. indexed access

   (get ["abc" false 3] 0)
   

2. count

   (count [1 3 "abc"])
   

3. constructing

   (vector 1 2 3)
   

4. add elements

   (conj [1 2 3] 4 5 6)
   

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Lists

• are sequential linked list
• add new elements at the head of the list

1. constructing

   (def cards '(10 :ace :jack 9)) # 包含了4个元素，因为（会被认为是方法调用，所有要加 单引号
   

2. first

   (first cards)
   (first (rest cards))
   

3. add

   (conj cards :quene) # add front
   

4. stack access

   # list can also be used as a stack 
   (def stack '(:a :b))
   (peek stack) # :a
   (pop stack) # :b
   

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1. colls ↩