Parallel work in javascript, how to return in the right order?

My class is to execute parallel tasks in accordance with the code specified parameter parallelJobs.

I need to return responses in the right order.

example code([URL=”http://codepen.io/anon/pen/LbbNaK?editors=0012″]codepen[/URL]):

[CODE]
class Parallel {
constructor(number) {
this.parallelJobs = number.parallelJobs;
this.results = [];
this.currentJobs = 0;
this.counterCalls = 0;
this.countJobCalls = 0;
}

pushArray(value) {
if (this.results.length && this.results.length !== this.counterCalls) {
setTimeout(() => {
this.pushArray(value, callNumber)
}, 50);
} else {

this.results.push(value);
this.counterCalls++;
}

this.currentJobs–;
return true;
}

runFunc(runConsole) {
this.currentJobs++;
runConsole(this.pushArray.bind(this));
}

job(runConsole) {
this.countJobCalls++;
if (this.currentJobs < this.parallelJobs) {
this.runFunc(runConsole);
} else {
setTimeout(() => {
this.job(runConsole);
}, 500);
}

return this;
}

done(onDone) {
this.lastJobCall = this.countJobCalls;
if (this.results.length && this.lastJobCall === this.results.length) {
onDone(this.results);
} else {
setTimeout(() => {
this.done(onDone)
}, 50);
}

return true;
}
}

var runner = new Parallel({
parallelJobs: 4
});

runner.job(step1)
.job(step2)
.job(step3)
.job(step4)
.done(onDone);

function step1(done) {
console.log(‘step1’);
setTimeout(done, 100, ‘step1’);
}

function step2(done) {
console.log(‘step2’);
setTimeout(done, 10, ‘step2’);
}

function step3(done) {
console.log(‘step3’);
setTimeout(done, 150, ‘step3’);
}

function step4(done) {
console.log(‘step4’);
setTimeout(done, 50, ‘step4’);
}

function onDone(results) {
console.log(results);
}
There should return an array [“step1”, “step2”, “step3”, “step4”] what best way this can be achieved in this example?[/CODE]

There should return an array [“step1”, “step2”, “step3”, “step4”] what best way this can be achieved in this example?

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