blank?

(blank? s)

如果 s 是 nil 、空字符串 "" 或者只包含空白的字符串，那么返回 true 。

user=> (clojure.string/blank? nil)
true

user=> (clojure.string/blank? "")
true

user=> (clojure.string/blank? "    ")
true

user=> (clojure.string/blank? "hello world")
false

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