Sha256: d9f1f96d1fcd20b136e32b57d8043db1649a053df07507413a50d7fd325c4bda
Contents?: true
Size: 954 Bytes
Versions: 7
Compression:
Stored size: 954 Bytes
Contents
class Array
unless method_defined?(:rotate)
# Rotates an array's elements from back to front n times.
#
# [1,2,3].rotate #=> [2,3,1]
# [2,3,1].rotate #=> [3,1,2]
# [3,1,2].rotate #=> [1,2,3]
#
# [1,2,3].rotate(3) #=> [1,2,3]
#
# A negative parameter reverses the order from front to back.
#
# [1,2,3].rotate(-1) #=> [3,1,2]
#
# CREDIT: Florian Gross, Thomas Sawyer
def rotate(n=1)
self.dup.rotate!(n)
end
end
unless method_defined?(:rotate!)
# Same as #rotate, but acts in place.
#
# a = [1,2,3]
# a.rotate!
# a #=> [2,3,1]
#
# CREDIT: Florian Gross, Thomas Sawyer
def rotate!(n=1)
n = n.to_int
return self if (n == 0 or self.empty?)
if n < 0
n.abs.times{ self.unshift( self.pop ) }
else
n.abs.times{ self.push( self.shift ) }
end
self
end
end
end
Version data entries
7 entries across 6 versions & 1 rubygems