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How to use the shuffle function from lodash

Find comprehensive JavaScript lodash.shuffle code examples handpicked from public code repositorys.

lodash.shuffle is a function that randomly shuffles the elements in an array and returns a new array with the shuffled elements.

astrobench.js

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 * @category Collections
 * @param {Array|Object|string} collection The collection to shuffle.
 * @returns {Array} Returns a new shuffled collection.
 * @example
 *
 * _.shuffle([1, 2, 3, 4, 5, 6]);
 * // => [4, 1, 6, 3, 5, 2]
 */
function shuffle(collection) {
  var index = -1,

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group-update.js

GitHub: PrairieLearn/PrairieLearn

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const students = [];
const resultList = await sqldb.queryAsync(sql.select_enrollments, aid);
resultList.rows.forEach((element) => {
  students.push(element.user_list);
});
_.shuffle(students);
var numStudents = resultList.rowCount;
var notAssigned = [];
const resultList2 = await sqldb.queryAsync(sql.select_not_assigned, aid);
resultList2.rows.forEach((element) => {

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How does lodash.shuffle work?

lodash.shuffle takes an array as input and returns a new array with the same elements, but in a shuffled order. The shuffling is performed using the Fisher-Yates shuffle algorithm, which works by iterating over the array from the last element to the first and swapping each element with a randomly chosen element from the remaining unshuffled elements.

The function can be called with an optional options object that allows the user to specify a random seed to ensure reproducibility of the shuffle, and also to limit the number of shuffles performed.

The original array is not modified, and the shuffled array is returned as the result of the function call.

lodash-contrib.commonjs.js

GitHub: node4good/lodash-contrib

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module.exports.selectKeys          = _.selectKeys;
module.exports.seq                 = _.seq;
module.exports.set                 = _.set;
module.exports.setPath             = _.setPath;
module.exports.setWith             = _.setWith;
module.exports.shuffle             = _.shuffle;
module.exports.size                = _.size;
module.exports.slice               = _.slice;
module.exports.slugify             = _.slugify;
module.exports.snakeCase           = _.snakeCase;

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+ 92 other calls in file

game.js

GitHub: dr4fters/dr4ft

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try {
  Object.assign(this, { addBots, useTimer, timerLength, shufflePlayers });
  this.renew();

  if (shufflePlayers) {
    this.players = shuffle(this.players);
  }

  if (this.shouldAddBots()) {
    const burnsPerPack = this.type === "cube draft"

Ai Example

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const _ = require("lodash");

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

const shuffledArray = _.shuffle(array);

console.log(shuffledArray); // Output: [3, 2, 4, 1, 5] or any other shuffled order

In the above example, lodash.shuffle is used to shuffle the array by returning a new array with its elements shuffled randomly. The original array remains unchanged. The shuffled array is assigned to the shuffledArray variable, and then logged to the console using console.log.

manager.js

GitHub: pocketnetteam/pocketnet.gui

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    forgetIfNotUsing()

}

self.similarnodes = function(node, count){
    var withrating = _.shuffle(self.initednodeswithrating())
    var i = 0
    var mylastblock = node.lastblock()

+ 7 other calls in file

library.js

GitHub: NodeBB/nodebb-widget-essentials

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} else if (widget.templateData.template.category) {
	topicData = await getCategoryTopics('month', 'votes');
	if (!topicData.length) {
		topicData = await getCategoryTopics('alltime', 'recent');
	}
	topicData = _.shuffle(topicData).slice(0, numTopics + 1);
	topicData = topicData.filter(topic => topic && !topic.deleted);
} else {
	const data = await topics.getTopicsFromSet('topics:recent', widget.uid, 0, numTopics);
	topicData = data ? data.topics : [];

playlists.js

GitHub: u-wave/core

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 * @param {Playlist} playlist
 * @returns {Promise<Playlist>}
 */
// eslint-disable-next-line class-methods-use-this
async shufflePlaylist(playlist) {
  playlist.media = shuffle(playlist.media);
  await playlist.save();
  return playlist;
}

+ 3 other calls in file

drawables.js

GitHub: PampaWarro/warrolight

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  this.preserveAlpha = !!options.preserveAlpha;
  this.invert = !!options.invert;
}
set gradient(gradient) {
  if (!gradient) {
    this._gradient = _.shuffle(allGradients())[0];
  } else {
    this._gradient = loadGradient(gradient);
  }
}

+ 2 other calls in file

node.js

GitHub: ortexx/spreadable

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async initBeforeSync() {
  this.__rootNetworkAddress = await this.db.getData('rootNetworkAddress');
  let initialNetworkAddress = this.options.initialNetworkAddress || this.address;

  if(Array.isArray(initialNetworkAddress)) {
    initialNetworkAddress = _.shuffle(initialNetworkAddress);
    initialNetworkAddress = initialNetworkAddress.sort(a => a === this.address? 0: -1);
  }
  
  this.initialNetworkAddress = await this.getAvailableAddress(initialNetworkAddress);

+ 20 other calls in file

contacts.js

GitHub: cozy/cozy-client

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  for (let i = 0; i < nContacts - nIndexed; i++) {
    notIndexedContacts.push(generateFakeContact(i, false))
  }


  let contacts = notIndexedContacts.concat(indexedContacts)
  contacts = shuffle(contacts)


  await client.stackClient.collection('io.cozy.contacts').updateAll(contacts)
}

index.js

GitHub: sluukkonen/iiris

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},
{
  name: 'sortWith.object',
  params: [obj1, obj10, obj100, obj1000],
  benchmarks: (array) => {
    const shuffled = _.shuffle(array)
    const iirisComparators = [
      I.ascend((obj) => obj.kConstant),
      I.descend((obj) => obj.kConstant),
      I.ascend((obj) => obj.k1),

lodash.js

GitHub: mdmarufsarker/lodash

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console.log(sample); // => 2


const sampleSize = _.sampleSize([1, 2, 3, 4], 2);
console.log(sampleSize); // => [3, 1]


const shuffle = _.shuffle([1, 2, 3, 4]);
console.log(shuffle); // => [4, 1, 3, 2]


const size = _.size([1, 2, 3]);
console.log(size); // => 3

+ 15 other calls in file

server.js

GitHub: ragulbalaji/burningbridgesbot

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stats.totalRounds++;
saveStats()

var players = games[group_id].playerorder; //get the array of players
var playerobj = games[group_id].players; //associative array of playerid -> player object
_.shuffle(players); //_.shuffle them
var playerz = [];
var numpairstochoose = chance.integer({
    min: 1,
    max: Math.max(Math.floor(players.length / 2), 1)

+ 3 other calls in file

genHash4RandPws.js

GitHub: jpe0824/javascript

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  emptyHashes,
  oneCharHashes,
  twoCharHashes,
  threeCharHashes
)
const shuffledHashes = _.shuffle(allHashes)

fs.writeFile('2K.hashes.txt', shuffledHashes.join('\n'), (err) => {
  if (err) throw err
  console.log('Hashes saved to 2K.hashes.txt')

blockEngine.js

GitHub: JSArrakis/Stream-Assistant

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selectedMovies.push(...tagMedia.Movies);
selectedShows.push(...tagMedia.Shows);
items.push(...tagMedia.Movies);
items.push(...tagMedia.Shows);

let shuffledItems = _.shuffle(items);

return {
    "Items": shuffledItems,
    "Movies": selectedMovies,

+ 2 other calls in file

bufferEnginedeprecated.js

GitHub: JSArrakis/Stream-Assistant

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combo.push(...commercials);
combo.push(...shorts);
combo.push(...music);

let shuffledCombo = _.shuffle(combo);
let half = Math.ceil(shuffledCombo.length / 2);
let firstHalf = shuffledCombo.slice(0, half);
let secondHalf = shuffledCombo.slice(half);

+ 2 other calls in file

roundRepository.js

GitHub: maloii/vs-time-machine

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Promise.all([
    db.sportsman.find({ competitionId: round.competitionId }),
    db.team.find({ competitionId: round.competitionId })
]).then(async ([resSportsmen, resTeams]) => {
    const sportsmen = _.shuffle((resSportsmen || []).filter((item) => item.selected));
    const teams = _.shuffle((resTeams || []).filter((item) => item.selected));

    let group = {
        roundId: round._id,
        competitionId: competition._id,

+ 33 other calls in file

index.js

GitHub: mazeyqian/node-koa-rain

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function sCommonRobotSend ({ target = 'workweixin', alias = '', type = '', data = {}, dataFn = undefined, duration = '', immediately = false, isSkipDayOffDates = false } = {}) {
  // `[飞书消息去重防吞: ${}]`
  const feishuNot = () => {
    const r = generateRndNum(7);
    const iii = generateRndNum(1);
    const prefixs = shuffle([
      '斗智斗勇去重消息',
      '飞书我只是机器人',
      '让我发发消息鸭',
      'ROBOT FOREVER',

gamesPost.js

GitHub: cja1/CM2020

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  );
})
.then(function() {

  //create pack and shuffle cards
  const shuffled = _.shuffle(createPack());

  var cardsP1 = [];
  var cardsP2 = [];

suggested.js

GitHub: HomieOmie/nodebb-temp

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        returnIds: true,
        timeRange: cutoff !== 0 ? cutoff / 1000 : 0,
        timeFilter: 'newer',
    });
    data.tids = data.tids.filter(_tid => _tid !== tid); // remove self
    return _.shuffle(data.tids).slice(0, 10).map(Number);
}

async function getCategoryTids(tid, cutoff) {
    const cid = await Topics.getTopicField(tid, 'cid');

+ 31 other calls in file

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