気になったことがあったのでメモ def classtree(obj) tree = Array.new tree[0] = obj.class i=0 while(tree[i] != nil) i += 1 tree[i] = tree[i-1].superclass end tree end nan = 0.0/0.0 #=> NaN pp classtree(nan) #=> [Float, Numeric, Object, BasicO…