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How to use the eachSeries function from async

Find comprehensive JavaScript async.eachSeries code examples handpicked from public code repositorys.

async.eachSeries is a function in the Async library for Node.js that runs an iterator function on each item in a collection in series, with each function only executing after the previous one has completed.

question.js

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 * @param {string} studentMessage - The message to display to the student.
 * @param {Object} courseData - Arbitrary data to be associated with the issues.
 * @param {function} callback - A callback(err) function.
 */
_writeCourseIssues(courseIssues, variant, authn_user_id, studentMessage, courseData, callback) {
  async.eachSeries(
    courseIssues,
    async (courseErr) => {
      await issues.insertIssueForError(courseErr, {
        variantId: variant.id,

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scriptSetAPICtrl.js

GitHub: GuanceCloud/dataflux-func

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  { key: 'envVariables',   model: envVariableModel,   fields: [ 'id', 'title' ] },
  { key: 'authLinks',      model: authLinkModel,      fields: [ 'id', 'funcId' ] },
  { key: 'crontabConfigs', model: crontabConfigModel, fields: [ 'id', 'funcId' ] },
  { key: 'batches',        model: batchModel,         fields: [ 'id', 'funcId' ] },
]
async.eachSeries(currentDataOpts, function(dataOpt, eachCallback) {
  var opt = {
    fields: dataOpt.fields.map(function(f) {
      return `${dataOpt.model.alias}.${f}`;
    }),

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How does async.eachSeries work?

async.eachSeries is an asynchronous control flow function in the async library for Node.js that iterates over a collection of elements, calling an asynchronous function on each element in series and continuing to the next element only when the previous element's function has completed.

setup.js

GitHub: GuanceCloud/dataflux-func

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console.log(toolkit.strf('Run upgrade: {0} -> {1}',
    toolkit.isNothing(currentUpgradeSeq) ? 'BASE' : currentUpgradeSeq,
    upgradeItems[upgradeItems.length -1].seq));

async.eachSeries(upgradeItems, function(item, eachCallback) {
  console.log(toolkit.strf('Upgading to SEQ {0}...', item.seq));

  dbHelper.query(item.database, null, function(err) {
    if (err) return eachCallback(err);

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groups.js

GitHub: CitizensFoundation/your-priorities-app

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models.AcActivity.findAll({
  where: {
    post_id: post.id
  }
}).then(function (activities) {
  async.eachSeries(activities, function (activity, innerSeriesCallback) {
    activity.set('group_id', outGroup.id);
    activity.set('community_id', outCommunityId);
    activity.set('domain_id', outDomainId);
    activity.save().then(function (results) {

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Ai Example

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const async = require("async");

const arr = [1, 2, 3, 4, 5];

async.eachSeries(
  arr,
  function (element, callback) {
    // Perform some asynchronous operation on element
    console.log(`Processing element ${element}...`);
    setTimeout(callback, 1000);
  },
  function (err) {
    // This function will be called once all elements have been processed
    if (err) {
      console.error(`An error occurred: ${err}`);
    } else {
      console.log("All elements processed successfully.");
    }
  }
);

In this example, async.eachSeries is used to iterate over the arr array and execute the function passed as the second argument for each element. The function takes two arguments: the current element and a callback function that must be called when the asynchronous operation for that element is complete. The final argument is an optional callback function that will be called once all elements have been processed, either successfully or with an error. In this example, the callback function simply logs a message to the console and waits for 1 second using setTimeout.

LifecycleConductor.js

GitHub: holajiawei/backbeat

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    this.logger.error(
        'error getting list of consumer offsets from zookeeper',
        { topic, error: err.message });
    return done(err);
}
return async.eachSeries(partitions, (partition, partitionDone) => {
    let consumerOffset;
    let topicOffset;
    async.waterfall([
        next => this._readZkOffset(topic, partition,

dataset.js

GitHub: brainlife/warehouse

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router.delete('/:id?', common.jwt({secret: config.express.pubkey}), function(req, res, next) {
    let ids = req.body.ids||req.params.id;
    if(!Array.isArray(ids)) ids = [ ids ];
    common.getprojects(req.user, function(err, canread_project_ids, canwrite_project_ids) {
        if(err) return next(err);
        async.eachSeries(ids, (id, next_id)=>{
            db.Datasets.findById(id, async (err, dataset)=>{
                if(err) return next_id(err);
                if(!dataset) return next_id(new Error("can't find the dataset with id:"+id));
                if(!canedit(req.user, dataset, canwrite_project_ids)) return next_id("can't edit:"+id);

+ 2 other calls in file

abide2.js

GitHub: brainlife/warehouse

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    });
});


function run(cb) {
    let list = fs.readFileSync("list", "ascii").split("\n");
    async.eachSeries(list, (path, next_path)=>{
        path = path.trim();
        if(path == "") return next_path();
        //console.log(path);
        db.Datasets.findOne({project: "5a9b626489426e42cf725795", desc: {$regex: path}}).exec((err, dataset)=>{

rule_handler.js

GitHub: brainlife/warehouse

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if(!rules || rules.length == 0) {
    console.debug("no rules to handle - sleeping for a bit");
    setTimeout(run, 1000*5);
} else {
    async.eachSeries(rules, handle_rule, err=>{
        if(err) console.error(err);
        console.debug("done handling "+rules.length+" rules - sleeping for a bit");
        rule_ex.publish("done", {count: rules.length});
        setTimeout(run, 1000*5);

+ 3 other calls in file

event_handler.js

GitHub: brainlife/warehouse

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    return next();
} 


//handle validator submission
async.eachSeries(task.config._outputs, async (output)=>{

    let datatype = await db.Datatypes.findById(output.datatype);
    if(!datatype.validator) return; //no validator for this datatype..

+ 3 other calls in file

common.js

GitHub: brainlife/warehouse

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    return cb("failed to query requested repo. code:"+res.status);
}

console.debug("loading contributor details")
let con_details = [];
async.eachSeries(cons, (con, next_con)=>{
    axios.get(con.url, { headers }).then(res=>{
        let detail = res.data;
        if(res.status != 200) {
            console.error(res);

+ 2 other calls in file

find-cosigner-users.js

GitHub: logicahealth/eHMP

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    });
}

function checkUsersForRequiresCosigner(users, noteTitles, rpcClient, callback) {
    var likelyNotes = [];
    async.eachSeries(users, function (user, userCallback) {
        if (_.has(user, 'status') && user.status !== 'active') {
            app.logger.info({ user: user }, 'skipping inactive user');
            return userCallback();
        }

objectDelete.js

GitHub: scality/cloudserver

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        });
    });
});

it('should be able to delete the bucket', done => {
    async.eachSeries(versionIds, (id, next) => {
        s3.deleteObject({
            Bucket: bucket,
            Key: key,
            VersionId: id,

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less.js

GitHub: Cyberitas/grunt-contrib-less

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if (this.files.length < 1) {
  grunt.verbose.warn('Destination not written because no source files were provided.');
}

async.eachSeries(this.files, function(f, nextFileObj) {
  var destFile = f.dest;

  var files = f.src.filter(function(filepath) {
    // Warn on and remove invalid source files (if nonull was set).

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theme.js

GitHub: denimandsteel/pawtucket2

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    grunt.verbose.warn('Destination not written because no source files were provided.');
}

var that = this;

async.eachSeries(dirs, function(d, nextDirObj) {
    var theme = path.basename(d);

    options.modifyVars = {
        theme: theme

+ 3 other calls in file

create-season.js

GitHub: tribox/tribox-contest

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// スクランブルを生成する
var scrambles = {};
var scramblesIndexes = contestsIndexes;

async.eachSeries(contestsIndexes, function(contestId, next) {
    var contest = contests[contestId];

    var url = 'http://' + Config.TNOODLE_HOST + ':2014/scramble/.json?seed=' + contestId + Config.SEED;
    contest.events.forEach(function(eventId) {

+ 19 other calls in file

controllers.js

GitHub: CMU-313/spring23-nodebb-banana

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    titles.push(`topic title ${i}`);
}

async.waterfall([
    function (next) {
        async.eachSeries(titles, (title, next) => {
            topics.post({ uid: fooUid, cid: category.cid, title: title, content: 'does not really matter' }, next);
        }, next);
    },
    function (next) {

file_manager.js

GitHub: Cloud-V/Backend

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    files: {},
};
swEntries = swEntries.filter(
    (entry) => foldersMeta[entry.parent].included
);
return async.eachSeries(
    swEntries,
    function (entry, callback) {
        let needle;
        if (

+ 9 other calls in file

BucketFileInterface.js

GitHub: scality/Arsenal

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    }
})
.on('end', () => {
    if (!cbDone) {
        cbDone = true;
        async.eachSeries(res.bucketList, (bucket, cb) => {
            this.getBucketAttributes(bucket.name, log,
                (err, bucketInfo) => {
                    if (err) {
                        return cb(err);

client.js

GitHub: seakeys/web-static-deploy

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  }, function (err) {
    if (err) {
      callback(err);
    } else {
      // just like mkdir -p
      async.eachSeries(dirs.reverse(), mkdir, callback);
    }
  });

});

+ 2 other calls in file

index.js

GitHub: marcelo-mason/awaitable-async

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    })
  })
}
async eachSeries(coll, iteratee) {    
  return new Promise(async (resolve, reject) => { 
    async.eachSeries(coll, iteratee, (err, res) => {
      if (err) { 
        reject(err)
      } else {
        resolve(res)

+ 21 other calls in file

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