如何检索HashMap中一个键的值，它是Clojure中的一个列表？

Question

我希望检索一个给定键的值，它是一个列表。

    (defn string-tuple [my-string]
      (partition 2 1 my-string))

    (defn split-and-frequent-tuple [lines]
      (frequencies (string-tuple lines)))

    (defn split-and-frequent [lines]
      (frequencies lines))

(defn string-split [my-string]
  (str/split my-string #" "))


    (def string-pairs (split-and-frequent-tuple (string-split "<s> I am Sam </s> <s> Sam I am </s> <s> I do not like green eggs and ham </s>")))

    ;; Calculate that bigram probability
    (println string-pairs)
    (println (string-pairs '(green eggs)))

基本上，字符串对计数项目数量的频率，比如(绿色鸡蛋)出现在文本中。但是，当我试图使用类似(string-pairs '(green eggs))的方法检索密钥时，我总是会得到nil，即使地图显示该键的值为1。

我只是想知道我哪里出了问题，我已经试过了所有的:(

耽误您时间，实在对不起

Answer 1

当您使用println显示值时，字符串和符号看起来是相同的，即使它们不相等。

调试时，在您的prn调用中使用明确显示值的pr-str，或者使用pr-str生成pr或prn将使用的字符串。

这将给出正确的结果(如果向量和列表的内容相等，则在Clojure中是相等的)。

(string-pairs ["green" "eggs"])