红宝石组整数数组到范围数组

Question

有没有一种优雅的方法来将整数数组分组到Ruby中的范围数组？

range1 = [*39..45] 
#=> [39, 40, 41, 42, 43, 44, 45] 

range2 = [*49..52] 
#=> [49, 50, 51, 52] 

range = range1 + range2 
#=> [39, 40, 41, 42, 43, 44, 45, 49, 50, 51, 52] 

range.build_ranges 
#=> [39..45, 49..52] 

Answer 1

是的。

鉴于原始数组已经排序和uniqued：

[39, 40, 41, 42, 43, 44, 45, 49, 50, 51, 52] 
.chunk_while{|i, j| i.next == j} 
.map{|a| a.first..a.last} 
# => [39..45, 49..52]