result << ary.shift
ary.delete(result.last)
end
- self.replace(result)
+ if result.size == self.size
+ nil
+ else
+ self.replace(result)
+ end
end
def uniq
- self.dup.uniq!
+ ary = self.dup
+ ary.uniq!
+ ary
end
def -(elem)
def |(elem)
raise TypeError, "can't convert to Array" unless elem.class == Array
- (self + elem).uniq!
+ ary = self + elem
+ ary.uniq! or ary
end
def &(elem)
ar
end
- def flatten!
- self.replace(self.flatten)
+ def flatten!(depth=nil)
+ modified = false
+ ar = []
+ self.each do |e|
+ if e.is_a?(Array) && (depth.nil? || depth > 0)
+ ar += e.flatten(depth.nil? ? nil : depth - 1)
+ modified = true
+ else
+ ar << e
+ end
+ end
+ if modified
+ self.replace(ar)
+ else
+ nil
+ end
end
def compact
def compact!
result = self.select { |e| e != nil }
- self.replace(result)
+ if result.size == self.size
+ nil
+ else
+ self.replace(result)
+ end
end
end