检查clojure中的字符相等性

Question

我是clojure的新手,并试图比较一个字符列表,我遇到了一些令人困惑的行为.当直接比较连接的字符串版本时,为什么难以(不可能？)比较字符列表的相等性？

(identical? (\A \T \C \G)  (\A \T \C \G) )
; ClassCastException java.lang.Character cannot be cast to clojure.lang.IFn  user/eval672     
;(NO_SOURCE_FILE:1)
(identical? '(\A \T \C \G)  '(\A \T \C \G) )
;false

;convert to string
(identical? "ATCG"  "ATCG" )
;True

Answer 1

来自REPL:

user=> (doc identical?)
-------------------------
clojure.core/identical?
([x y])
Tests if 2 arguments are the same object

如果您了解Java编程语言,那么相同吗？在处理引用时,它在Java中表现得像==运算符.

你可以试试这个:

(= '(\A \T \C \G)  '(\A \T \C \G) )
=> true

再次,在REPL中:

user=> (doc =)
-------------------------
clojure.core/=
([x] [x y] [x y & more])
Equality. Returns true if x equals y, false if not. Same as
Java x.equals(y) except it also works for nil, and compares
numbers and collections in a type-independent manner.  Clojure's immutable data
structures define equals() (and thus =) as a value, not an identity,
comparison.

所以不,比较Clojure中列表的相等性并不是不可能的,也绝对不难.REPL是你最好的朋友.