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Say we have this nested vector:
(def coll [nil [["this" nil "this"] nil] nil "this"])
How would you design a remove-nil function so that all nil disappear?
remove-nil
(remove-nil coll) ;> [[["this" "this"]] "this"]
(clojure.walk/postwalk #(if (coll? %) (into (empty %) (remove nil? %)) %) coll) ;=> [[["this" "this"]] "this"]
我希望用户只输入十位数字而无需标点符号。我已经尝试过以下模式。在每种情况下,都会弹出一个窗口要求我“请匹配请求的格式”。我可能会切换到 jquery 解决方案,但我仍然很好奇为什么这不起作用?
感谢您的任何见解,苏
<label for="cellPhone"> <g:messag