以有效的方式将Array数组转换为字符串数组

Question

我有一个数组

arr=[["Sumit", "where"], ["where", "are"], ["are", "you"]]

我要转换

arr=["Sumit where", "where are", "are you"]

我怎么能以有效的方式做到这一点

Answer 1

arr=[["Sumit", "where"], ["where", "are"], ["are", "you"]]  
v = arr.map { |x| x.join(" ") }  
p v 

Answer 2

尝试：

arr=[["Sumit", "where"], ["where", "are"], ["are", "you"]]
arr = arr.map {|i| i.join(' ') }