Method: Array#rotate

Defined in:

ext/enterprise_script_service/mruby/mrbgems/mruby-array-ext/mrblib/array.rb

#rotate(count = 1) ⇒ Object

call-seq:

   ary.rotate(count=1)    -> new_ary

Returns a new array by rotating +self+ so that the element at +count+ is
the first element of the new array.

If +count+ is negative then it rotates in the opposite direction, starting
from the end of +self+ where +-1+ is the last element.

   a = [ "a", "b", "c", "d" ]
   a.rotate         #=> ["b", "c", "d", "a"]
   a                #=> ["a", "b", "c", "d"]
   a.rotate(2)      #=> ["c", "d", "a", "b"]
   a.rotate(-3)     #=> ["b", "c", "d", "a"]

# File 'ext/enterprise_script_service/mruby/mrbgems/mruby-array-ext/mrblib/array.rb', line 427

def rotate(count=1)
  ary = []
  len = self.length

  if len > 0
    idx = (count < 0) ? (len - (~count % len) - 1) : (count % len) # rotate count
    len.times do
      ary << self[idx]
      idx += 1
      idx = 0 if idx > len-1
    end
  end
  ary
end