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1\n})\n\nqueue.add(1, example, [-1])\nfor (let ii = 0; ii < 5; ++ii) {\n queue.add(0, example, [ii])\n}\nconst finished = []\nqueue.run().then(\n console.log(finished)\n})\n\nfunction example (num, next) {\n setTimeout(() => {\n finished.push(num)\n next()\n }, 5 - Math.abs(num))\n}\n```\n\nwould output\n\n```\n[ 0, 1, 2, 3, 4, -1 ]\n```\n\nIf you bump concurrency to `2`, then you get:\n\n```\n[ 1, 0, 3, 2, 4, -1 ]\n```\n\nThe concurrency means that they don't finish in order, because some take\nlonger than others. Each priority level must finish entirely before the\nnext priority level is run. See\n[PRIORITIES](https://github.com/iarna/run-queue#priorities) below. This is\neven true if concurrency is set high enough that all of the regular queue\ncan execute at once, for instance, with `maxConcurrency: 10`:\n\n```\n[ 4, 3, 2, 1, 0, -1 ]\n```\n\n## API\n\n### const queue = new RunQueue(options)\n\nCreate a new queue. Options may contain:\n\n* maxConcurrency - (Default: `1`) The maximum number of jobs to execute at once.\n* Promise - (Default: global.Promise) The promise implementation to use.\n\n### queue.add (prio, fn, args)\n\nAdd a new job to the end of the queue at priority `prio` that will run `fn`\nwith `args`. If `fn` is async then it should return a Promise.\n\n### queue.run ()\n\nStart running the job queue. Returns a Promise that resolves when either\nall the jobs are complete or a job ends in error (throws or returns a\nrejected promise). If a job ended in error then this Promise will be rejected\nwith that error and no further queue running will be done.\n\n## PRIORITIES\n\nPriorities are any integer value >= 0.\n\nLowest is executed first.\n\nPriorities essentially represent distinct job queues. All jobs in a queue\nmust complete before the next highest priority job queue is executed.\n\nThis means that if you have two queues, `0` and `1` then ALL jobs in `0`\nmust complete before ANY execute in `1`. If you add new `0` level jobs\nwhile `1` level jobs are running then it will switch back processing the `0`\nqueue and won't execute any more `1` jobs till all of the new `0` jobs\ncomplete." }