阵幂

Question

我有一个字符串，例如

a = 'Thank you for your answer' 

，我需要从字符串中每个单词的长度，并将其提升到电源下一个单词，在这个例子：

result = ((((5**3)**3)**4)**6) 

我该怎么做？

Answer 1

inject会做：

s = 'Thank you for your answer' 

s.split(/\s+/) 
# => ["Thank", "you", "for", "your", "answer"] 

s.split(/\s+/).map{|w| w.length} 
# => [5, 3, 3, 4, 6] 

s.split(/\s+/).map{|w| w.length}.inject(:**) 
# => 9495567745759798747473242269561957154220965833619944966279779990829008230644811159033118931771413600093027632988162967109246892505325376987457275390625 

((((5**3)**3)**4)**6) 
# => 9495567745759798747473242269561957154220965833619944966279779990829008230644811159033118931771413600093027632988162967109246892505325376987457275390625