question-two.js

function *gen() {
  for(var i = 0, len = 10; i < len; ++i) {
    try {
      console.log('try')
      console.log('got try', yield i)
    } catch(err) {
      console.log('catch')
      console.log('got catch', yield i + 10)
    } finally {
      console.log('finally')
      console.log('got finally', yield i + 20)
    }
  }
}

var iter = gen()
  , accum = 0
  , i = 2 
  , value

do {
  console.log('---- ' + i +' -----')
  value = i % 3 === 0 ?
    iter.throw(new Error('throw')) : iter.next('recv')
  if(value.value !== undefined) {
    accum += value.value
  }

  ++i
} while(!value.done)

// WHAT IS ACCUM?
// how many times did it iterate?
console.log(accum, i - 2)