a simple asynchronous queue
npm install then-queue
varQueue=require('then-queue');varq=newQueue();A fresh queue!
Push an item onto the queue
Pop an item from the queue
Amount of items in the queue (note that this can be negative if pop has been called more times than push).
The length-changed event gets emitted whenever pop or push has been called. You could use it to spawn/kill workers when the length changes.