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Versions: 26
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Contents
class Array
# Rotates an array's elements from back to front n times.
#
# [1,2,3].rotate #=> [3,1,2]
# [3,1,2].rotate #=> [2,3,1]
# [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) #=> [2,3,1]
#
def rotate(n=1)
self.dup.rotate!(n)
end
# Same as #rotate, but acts in place.
#
# a = [1,2,3]
# a.rotate!
# a #=> [3,1,2]
#
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
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TCArray < Test::Unit::TestCase
def test_rotate
a = [1,2,3]
assert_equal( [3,1,2], a.rotate, 'clockwise' )
assert_equal( [2,3,1], a.rotate(-1), 'counter-clockwise' )
end
def test_rotate!
a = [1,2,3]
a.rotate!
assert_equal( [3,1,2], a, 'clockwise' )
a.rotate!(-1)
assert_equal( [1,2,3], a, 'counter-clockwise' )
end
end
=end
Version data entries
26 entries across 26 versions & 1 rubygems