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我需要取集合的第一个元素,取之前需要先判断这个元素是否存在
文档中说可以用 include(coll, element)
但是我的元素是对象,也不清楚对象具体是什么,也没法用include(list,某个对象),如何不报错直接返回空
The text was updated successfully, but these errors were encountered:
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我需要取集合的第一个元素,取之前需要先判断这个元素是否存在
文档中说可以用
include(coll, element)
但是我的元素是对象,也不清楚对象具体是什么,也没法用include(list,某个对象),如何不报错直接返回空
The text was updated successfully, but these errors were encountered: