what' s ruby?(ref: ruby编程语言)

q1:

irb(main):001:0> tmp=(1..10).to_a
=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
irb(main):002:0> tmp.each.class
=> Enumerator
irb(main):003:0> tmp.select.class
=> Enumerator
irb(main):004:0> tmp.map.class
=> Enumerator
irb(main):005:0>

q2:  如何定义 tmp=(1..10).to_a; puts tmp[2,5] 里面的[]方法？

举例：

irb(main):002:0> class Fixnum
irb(main):003:1> def + (other)
irb(main):004:2> self
irb(main):005:2> end
irb(main):006:1> end
=> :+
irb(main):007:0> 1+2
=> 1
irb(main):006:0> 1+10
=> 1
irb(main):005:0>

what' s ruby?(ref: ruby编程语言)