Method: Interval#step

Defined in:
lib/standard/facets/interval.rb

#step(n = 1, d = nil) ⇒ Object

:yield:



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# File 'lib/standard/facets/interval.rb', line 230

def step(n=1, d=nil)  # :yield:
  return (n < 0 ? @last : @first) if degenerate?  # is this right for all values of n ?

  if block_given?
    s = d ? self.length.to_f * (n.to_f / d.to_f) : n.abs
    raise "Cannot iterate over zero length steps." if s == 0
    s = s * @direction
    if n < 0
      e = @exclude_last ? @last - s : @last
      #e = @exclude_last ? @last.pred(s) : @last
      t = @exclude_last ? 1 : 0
      #while e.cmp(@first) >= t
      while (e <=> @first) >= t
        yield(e)
        e -= s
        #e = e.pred(s)
      end
    else
      e = @exclude_first ? @first + s : @first
      #e = @exclude_first ? @first.succ(s) : @first
      t = @exclude_last ? -1 : 0
      #while e.cmp(@last) <= t
      while (e <=> @last) <= t
        yield(e)
        e += s
        #e = e.succ(s)
      end
    end
  else
    Enumerator.new(self, :step, n, d)
  end
end