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How to use the apply function from async

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

async.apply is a function in the async library for Node.js that allows a function to be partially applied with some of its arguments preset and returns a new function that can be called with the remaining arguments.

commandsAmqp-test.js

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const utils = require('../../utils');
const request = utils.request;
const should = require('should');
const iotAgentLib = require('iotagent-node-lib');
const amqp = require('amqplib/callback_api');
const apply = async.apply;
let contextBrokerMock;
let oldTransport;
let amqpConn;
let channel;

+ 2 other calls in file

unimail-office365.js

GitHub: Salesflare/unimail

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    callback = options;
    options = {};
}

return Async.parallel({
    refreshToken: Async.apply(this._refreshTokenIfNeeded.bind(this), auth),
    convertAttachments: (callback) => {

        if (!params.attachments || params.attachments.length === 0) {
            return callback();

How does async.apply work?

The async.apply function in the Async library in JavaScript creates a new function with the given arguments partially applied to the original function. When the new function is called, it will call the original function with the partially applied arguments followed by any additional arguments passed to the new function.

jquery.reading-helper.js

GitHub: megumiimai/jquery-kanji-reading-helper

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* @returns {Function} the partially-applied function
* @example
*
* // using apply
* async.parallel([
*     async.apply(fs.writeFile, 'testfile1', 'test1'),
*     async.apply(fs.writeFile, 'testfile2', 'test2')
* ]);
*
*

+ 11 other calls in file

list.js

GitHub: HomieOmie/nodebb-temp

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});

describe('listRemoveAll()', () => {
    before((done) => {
        async.series([
            async.apply(db.listAppend, 'testList5', 1),
            async.apply(db.listAppend, 'testList5', 1),
            async.apply(db.listAppend, 'testList5', 1),
            async.apply(db.listAppend, 'testList5', 2),
            async.apply(db.listAppend, 'testList5', 5),

+ 14 other calls in file

Ai Example

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const async = require("async");

function add(a, b, callback) {
  callback(null, a + b);
}

const addFive = async.apply(add, 5);

addFive(10, (err, result) => {
  if (err) {
    console.error(err);
    return;
  }
  console.log(result);
});

// Output: 15

In this example, we define a function called add that takes two arguments a and b, and a callback function callback. Inside add, we call callback with the result of a + b. We then use async.apply to create a new function called addFive, which takes one argument (the second argument to add, in this case b), and returns a new function that takes one argument (the first argument to add, in this case a). Finally, we call addFive with 10 as its argument, which creates a new function that adds 5 to its argument. When we call that new function with 10, we get the result 15.

hash.js

GitHub: HomieOmie/nodebb-temp

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db.deleteObjectFields('testObject10', ['delete1', 'delete2'], function (err) {
    assert.ifError(err);
    assert(arguments.length < 2);
    async.parallel({
        delete1: async.apply(db.isObjectField, 'testObject10', 'delete1'),
        delete2: async.apply(db.isObjectField, 'testObject10', 'delete2'),
    }, (err, results) => {
        assert.ifError(err);
        assert.equal(results.delete1, false);
        assert.equal(results.delete2, false);

+ 11 other calls in file

authentication.js

GitHub: HomieOmie/nodebb-temp

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        next();
    })(req, res, next);
}, Auth.middleware.validateAuth, (req, res, next) => {
    async.waterfall([
        async.apply(req.login.bind(req), res.locals.user, { keepSessionInfo: true }),
        async.apply(controllers.authentication.onSuccessfulLogin, req, req.uid),
    ], (err) => {
        if (err) {
            return next(err);
        }

+ 3 other calls in file

helper.js

GitHub: satchinard/formio-atd

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  return this.template.roles[title] || undefined;
};

Helper.prototype.getRolesAndForms = function(done) {
  async.series([
    async.apply(this.getForms.bind(this)),
    async.apply(this.getRoles.bind(this))
  ], (err) => {
    if (err) {
      return done(err);

meta.js

GitHub: Sho-Shoo/NodeBB_ML

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before((done) => {
    Groups.cache.reset();
    // Create 3 users: 1 admin, 2 regular
    async.series([
        async.apply(User.create, { username: 'foo', password: 'barbar' }), // admin
        async.apply(User.create, { username: 'baz', password: 'quuxquux' }), // restricted user
        async.apply(User.create, { username: 'herp', password: 'derpderp' }), // regular user
    ], (err, uids) => {
        if (err) {
            return done(err);

+ 8 other calls in file

sorted.js

GitHub: Sho-Shoo/NodeBB_ML

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describe('sortedSetsRemove()', () => {
    before((done) => {
        async.parallel([
            async.apply(db.sortedSetAdd, 'sorted4', [1, 2], ['value1', 'value2']),
            async.apply(db.sortedSetAdd, 'sorted5', [1, 2], ['value1', 'value3']),
        ], done);
    });

    it('should remove element from multiple sorted sets', (done) => {

+ 5 other calls in file

Other functions in async

Sorted by popularity

async.parallel is the most popular function in async (1226 examples)

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