使用ruby在数组中过滤频繁项
Posted
技术标签:
【中文标题】使用ruby在数组中过滤频繁项【英文标题】：frequent item filter in array using ruby 【发布时间】：2013-05-26 22:26:26 【问题描述】：total =["a","a","a","b","b","b","b","b","b","b","b","c","c","c","d","d","d","d","d","d","d","d","b","b","e","e","e","e","e","f"]
smart_total = total.group_by|i| i.map|i,j| [i,j.length]
smart_total = [["a", 3], ["b", 10], ["c", 3], ["d", 8], ["e", 5], ["f", 1]]
我有样本数组
sample1 = ["a","f","b"]
根据最大频繁项，最终输出应该是一个元素，这里是b
sample2 = ["a","c"]
此处的输出可以是a 或c
我正在寻找类似的东西
result1 = sample1.magik_function
=>"b"
【问题讨论】：
【参考方案1】：sample1.max_by|c| total.count(c) # => "b"
sample2.max_by|c| total.count(c) # => "a"
【讨论】：
以上是关于使用ruby在数组中过滤频繁项的主要内容，如果未能解决你的问题，请参考以下文章
使用 NSPredicate 根据数组属性过滤 CoreData 项列表