How to iterate over the results of a generator function

Question

How to iterate over the results of a generator function

Is there a better way to iterate over the results of a generator, my for loop is ugly:

for(let job = readyJob.next(); !job.done; job = readyJob.next()){ }

In context there is a generator function that can determine if there is a batch of work, consisting of 1..* jobs (the generator may also return no jobs in the batch). There is a continuous loop that instantiates the generator and iterates over the batch doing work on the job (logging).

Is there a more elegant solution to this iteration problem. I mean this looks like a traditional iterator from Java/C# which isn't bad. Something like an "each" would be super readable... That's my hope anyhow.

 let getReadyJob = function *(instance){
    let numJobs = 7 ; // getRandomInt(0, 10) ;
    for(let i = 0; i < numJobs; i++) {
        yield {
            jobId: '' + instance + '::' + i,
            jobReadyOn: (new Date()).valueOf()
        };
    }
}

then

while(true){
    let readyJob = getReadyJob()

    for(let job = readyJob.next(); !job.done; job = readyJob.next()){
        console.log(JSON.stringify(job.value)) ;
    }
}

javascript
node.js
generator
ecmascript-6

Answer 1

Yes, if your environment already supports for...of:

for (var job of readyJob) {
  // ...
}

If not, have seen this a couple of times:

var next;
while (!(next = readyJob.next()).done) {
   var job = next.value;
   // ...
}