如何在Clojure中的列表HashMap中检索键的值

Question

我想检索一个给定键的值，该键是一个列表。

    (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，字符串对统计文本中出现类似（绿色鸡蛋）的项目数量的频率。然而，当我尝试使用类似(string-pairs '(green eggs))的东西检索密钥时，我总是会得到nil，即使映射显示该密钥的值为1。

我只是想知道哪里出了问题，我已经试过了:( 的所有东西

感谢您抽出时间

Answer 1

使用println显示值时，字符串和符号看起来是一样的，即使它们不相等。

调试时，请使用明确显示值的prn，或者使用pr-str在println调用中生成pr或prn将使用的字符串。

这应该会给您正确的结果（如果向量和列表的内容相等，那么它们在Clojure中是相等的）。

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