如何检索作为 Clojure 列表的 HashMap 中的键的值？

Question

我正在寻找一个给定键的值，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，字符串对计算诸如（绿色鸡蛋）之类的项目在文本中出现的频率。但是，当我尝试使用 (string-pairs '(green eggs)) 之类的方法检索密钥时，即使地图显示该密钥的值为 1，我总是会返回 nil。

我只是想知道我哪里出错了，我已经尝试了所有:(

感谢您的宝贵时间

Answer 1

当您使用println 显示值时，字符串和符号看起来相同，即使它们不相等。

在调试时，使用prn 明确显示值，或使用pr-str 生成字符串pr 或prn 将在println 调用中使用。

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

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