Interview question: javascript implement js generator

jsGeneratorImpl.js

// see https://segmentfault.com/a/1190000022638499
var gen = () => {
    var step = 0
    return {
        next(v) {
            // like std generator g.next(v) and var r = yield smth, "r" get the v", I can handle "v" in this block
            step++
            var value
            var done = false
            // if cond and value = to simulate `var r = yield value`
            if (step == 1) {
                value = "1"
            } else if (step == 2) {
                value = "2"
            } else {
                done = true
            }
            return {value, done}
        }
    }
}
var g = gen()
console.log(g.next())
console.log(g.next())
console.log(g.next())

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