subset?

(subset? set1 set2)

判断 set1 是否 set2 的子集。

查看源码

user> (clojure.set/subset? #{:a :b} #{:a :b :c})
true

user> (clojure.set/subset? #{:a :b} #{:a :c :d})
false

user> (clojure.set/subset? #{} #{:a :c :d})
true

user> (clojure.set/subset? #{:a} #{:a})
true

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