如何在Clojure中创建一个字符串列表？

Question

我想在Clojure中创建一个等价于以下Java代码的字符串列表:

List<String> cities = Arrays.asList(new String[] {"Berlin", "Brussels", "Helsinki", "Madrid", "Oslo", "Paris","Stockholm" });

:但我不确定确切的语法

Answer 1

严格地说,上面提供的例子将产生向量.列表可以通过以下方式生成:

(list "Berlin", "Brussels", "Helsinki", "Madrid", "Oslo", "Paris","Stockholm")

或更短:

'("Berlin", "Brussels", "Helsinki", "Madrid", "Oslo", "Paris","Stockholm")

在某些情况下,这种差异可能很重要.

Answer 2

(def cities ["Berlin" "Brussels" "Helsinki" "Madrid" "Oslo" "Paris" "Stockholm"])

http://en.wikibooks.org/wiki/Clojure_Programming/Tutorials_and_Tips#Clojure_for_Java_Programmers

Answer 3

一般来说,你可以使用你想要创建的集合的名称作为创建它的函数(容易记住呃？):

(vector     "Berlin", "Brussels", "Helsinki", "Madrid", "Oslo", "Paris","Stockholm")
(hash-map   "Berlin", "Brussels", "Helsinki", "Madrid", "Oslo", "Paris")
(sorted-map "Berlin", "Brussels", "Helsinki", "Madrid", "Oslo", "Paris")
(array-map  "Berlin", "Brussels", "Helsinki", "Madrid", "Oslo", "Paris")
(hash-set   "Berlin", "Brussels", "Helsinki", "Madrid", "Oslo", "Paris" "Stockholm")
(sorted-set "Berlin", "Brussels", "Helsinki", "Madrid", "Oslo", "Paris" "Stockholm")

或者你可以使用,into如果你事先不知道你需要创建什么类型.

(defn make-trip [trip cities]
    (into trip cities))

传递类似的东西 (make-trip #{"home"} ["Berlin", "Brussels", "Helsinki", "Madrid", "Oslo", "Paris"])