jkaihsu
3/7/2013 - 8:23 AM

Implement Array#pad and Array#pad!. Each method accepts a minimum size (non-negative integer) and an optional pad value as arguments. If

Implement Array#pad and Array#pad!. Each method accepts a minimum size (non-negative integer) and an optional pad value as arguments.

If the array's length is less than the minimum size, Array#pad should return a new array padded with the pad value up to the minimum size.

For example, ruby [1,2,3].pad(5)

should return

[1,2,3,nil,nil] And ruby [1,2,3].pad(5, 'apple')

should return

[1,2,3,'apple', 'apple'] If the minimum size is less than or equal to the length of the array, it should just return the array.

That is, [1,2,3].pad(3) should return [1,2,3].

my_array.pad(0) should always return an array equal to my_array. Array#pad should always return a new object, i.e., it should be non-destructive.

Array#pad! behaves identically to Array#pad except that it modifies the underlying array.

pad.rb
content_copyfile_download
class Array
  def pad!(min_size, value = nil)
    x = min_size - self.count
    x.times {self << value}
    self  
  end

  def pad(min_size, value = nil)
    self.clone.pad!(min_size, value)
  end

end