如何从Ruby数组中选择最长的字符串？

Question

However above [duplicate suggestion] is for multidimensional array, not targeting the simpler case I am posing here.

For example if I have:

'one','two','three','four','five'

I want to select three as it is the longest string. I tried:

['one','two','three','four','five'].select{|char_num| char_num.size.max} 

but Enumerable#max doesn't return the right result.

Answer 1

Just do as below using Enumerable#max_by :

ar = ['one','two','three','four','five']
ar.max_by(&:length) # => "three"

Answer 2

arr.map(&:length).max     -

Answer 3

您还可以使用：

['one','two','three','four','five'].inject { |f, s| f.length > s.length ? f : s }