Ruby - Array Array Sorting
Introduction
The sort method compares adjacent array elements using the comparison operator <=>.
This operator is defined for many Ruby classes, including Array, String, Float, Date, and Fixnum.
You can define your own sorting routine by sending a block to the sort method.
The following block determines the comparison used by the sort method:
Demo
arr=['h','e','l','l','o',' ','w','o','r','l','d'] arr.sort{ # from ww w . j a v a 2 s . c o m |a,b| a.to_s <=> b.to_s }
Here arr is an array object, and the variables a and b represent two contiguous array elements.
Demo
arr = ['h','e','l','l','o',' ',nil,'w','o','r','l','d',1,2,3,nil,4,5] # sort ascending from nil upwards sorted_arr = arr.sort{ # www . ja va2 s.c o m |a,b| a.to_s <=> b.to_s } p(sorted_arr )
Result
To sort array in descending order: change the order of the items on either side of the comparison operator:
Demo
arr = ['h','e','l','l','o',' ',nil,'w','o','r','l','d',1,2,3,nil,4,5] reverse_sorted_arr = arr.sort{ # w w w. ja va 2 s. c om |a,b| b.to_s <=> a.to_s } p(reverse_sorted_arr )
Result
