CollectionUtil

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Struct CollectionUtil 

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pub struct CollectionUtil;

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impl CollectionUtil

vec常规操作

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pub fn first<'a, T>(vec: &'a Vec<T>) -> Option<&'a T>

获取vec的第一个元素，不移除

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pub fn remove_first<T>(vec: &mut Vec<T>) -> Option<T>

移除并获取vec的第一个元素

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pub fn last<'a, T>(vec: &'a Vec<T>) -> Option<&'a T>

获取vec的最后一个元素，不移除

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pub fn pop<T>(vec: &mut Vec<T>) -> Option<T>

获取vec的最后一个元素，移除

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