Interview question: javascript implement async await

asyncAwaitImpl.js

// see https://segmentfault.com/a/1190000022638499
var async = (gen) => {
    var g = gen()
    p = g.next().value
    var next = (p) => {
        p.then((v) => {
            var p2 = g.next(v).value
            if (p2) {
                next(p2)
            }
        })
    }
    next(p)
}
async(function* () {
    console.log(yield /*yield like await*/ new Promise((resolve) => {
        resolve("1")
    }))
    console.log(yield new Promise((resolve) => {
        resolve("2")
    }))
})

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