(merge & maps)
返回一个含有剩余项的map。 如果key在多个map中存在,后面的值(从左向右的顺序)会覆盖前面的值
user=> (merge {:a 1 :b 2 :c 3} {:b 9 :d 4}) {:d 4, :a 1, :b 9, :c 3}
user=> (merge {:a 1 :b 2 :c 3} {:b 9 :d 4} {:b 8 :d 3}) {:d 3, :c 3, :b 8, :a 1}
max-key
min-key
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