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How to use the sum function from lodash

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

lodash.sum is a function in the Lodash library that calculates the sum of an array of numbers.

album.js

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const currentFromDate = _.map(this.files, 'meta.date')
const currentToDate = _.map(this.files, 'meta.date')
// aggregate all stats
this.stats = {
  albums: this.albums.length,
  photos: _.sum(_.compact(_.concat(nestedPhotos, currentPhotos))) || 0,
  videos: _.sum(_.compact(_.concat(nestedVideos, currentVideos))) || 0,
  fromDate: _.min(_.compact(_.concat(nestedFromDates, currentFromDate))),
  toDate: _.max(_.compact(_.concat(nestedToDates, currentToDate)))
}

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+ 9 other calls in file

PLDB.js

GitHub: breck7/pldb

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    obj.jobsRank,
    obj.usersRank,
    obj.factsRank,
    obj.pageRankLinksRank
  ]
  obj.totalRank = lodash.sum(lodash.sortBy(top3).slice(0, 3))
})
objects = lodash.sortBy(objects, ["totalRank"])

const ranks = {}

647

+ 15 other calls in file

How does lodash.sum work?

lodash.sum is a method in the Lodash library that accepts an array of numbers and returns the sum of those numbers. It can also accept an iteratee function that modifies each element before computing the sum. Internally, it uses a simple for loop to iterate over the array and accumulate the sum.

lodash-contrib.commonjs.js

GitHub: node4good/lodash-contrib

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module.exports.startsWith          = _.startsWith;
module.exports.strContains         = _.strContains;
module.exports.stripTags           = _.stripTags;
module.exports.sub                 = _.sub;
module.exports.subtract            = _.subtract;
module.exports.sum                 = _.sum;
module.exports.sumBy               = _.sumBy;
module.exports.tail                = _.tail;
module.exports.take                = _.take;
module.exports.takeRight           = _.takeRight;

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+ 92 other calls in file

index.js

GitHub: sluukkonen/iiris

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params: [num1, num10, num100, num1000],
benchmarks: (array) => {
  const add = (x, y) => x + y
  return {
    iiris: () => A.sum(array),
    lodash: () => _.sum(array),
    ramda: () => R.sum(array),
    native: () => array.reduce(add, 0),
  }
},

Ai Example

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const _ = require("lodash");

const numbers = [2, 4, 6, 8, 10];
const sum = _.sum(numbers);
console.log(sum); // Output: 30

In this example, lodash.sum is used to calculate the sum of an array of numbers. The numbers array contains the values [2, 4, 6, 8, 10], and _.sum(numbers) returns the value 30, which is the sum of all the numbers in the array.

CancerDB.js

GitHub: breck7/CancerDB

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const file = this.folder.getFile(id)
const sorted = lodash.sortBy(toAdd[id], "sex", row => parseInt(row.age))
const tree = new TreeNode(sorted)
if (!file.has("uscsTable"))
  file.appendLineAndChildren("uscsTable 2019", tree.toDelimited("|"))
const deaths = lodash.sum(
  sorted.map(item => parseInt(item.deaths)).filter(num => !isNaN(num))
)
if (deaths) file.set("uscsDeathsPerYear", deaths.toString())
const cases = lodash.sum(

+ 3 other calls in file

lodash.js

GitHub: mdmarufsarker/lodash

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console.log(round); // => 4


const subtract = _.subtract(6, 4);
console.log(subtract); // => 2


const sum = _.sum([4, 2, 8, 6]);
console.log(sum); // => 20


const sumBy = _.sumBy([{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }], o => o.n);
console.log(sumBy); // => 20

+ 15 other calls in file

lodash.js

GitHub: bySxS/ExpressJS-knex-faker

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logger.info('делим число 20 на 2 через curry2 = ' + curriedDivide(10)(2))


//flow ======================= //массив функций которые вызываются последовательно и отдает функцию
const notFlatArray = [1, 2, 3, [4, 5, [6, 7, 8, 9, 10]]] //сумма 55


logger.info('не правильная сумма чисел массива вложенного = ' + _.sum(notFlatArray))


const sumFlat = _.flow([_.concat, _.flattenDeep, _.sum])
//_.concat - соединяем массивы
//_.flattenDeep - избавляемся от многоуровнивости в массиве и делает плоским

hakemus.js

GitHub: solita/livijuku-front

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  return _.sumBy(avustuskohteet, _.partial(h.avustuskohdeRahamaara, 'haettavaavustus'));
};

$scope.sumHaettavaElyAvustus = function () {
  var maararahatarpeetSum =
    _.sum(_.values($scope.hakemus.ely)) +
    _.sumBy($scope.maararahatarpeet, 'sidotut') + _.sumBy($scope.maararahatarpeet, 'uudet') - _.sumBy($scope.maararahatarpeet, 'tulot');

  var kehittamishankkeetSum = _.sumBy($scope.kehittamishankkeet, 'arvo');
  return (maararahatarpeetSum + kehittamishankkeetSum);

gulpfile.js

GitHub: achinwo/irev-exporter

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exports.fetchStats = async function(){
    const newStates = [];
    for (const state of STATES) {
        const lgaData = require(`./build/data_lgas_${state.id}`);


        const wardCount = _.sum(lgaData.data.map(l => l.wards.length));


        let puCount = 0;
        let results = 0;

gulpfile.js

GitHub: achinwo/irev-exporter

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const wardData = {};
for(const fn of await fs.readdir('./build')) {
    if (!fn.startsWith('data_ward_')) continue;

    const data = require(`./build/${fn}`);
    const numResults = _.sum(data.data.map((pu) => !pu.document?.url || (url.parse(pu.document?.url).pathname === '/') ? 0 : 1) || [0]);

    const ward = _.first(data.wards);
    const wardId = ward.ward_id;
    wardData[wardId] = {

+ 3 other calls in file

gulpfile.js

GitHub: achinwo/irev-exporter

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pctTranscribed: (((_.toInteger(puDataRes.submittedCount) || 0) / state.resultCount) * 100),
resultsCount: state.resultCount,
pctUploadedFeb25: ((docsByDate[state.id].feb25 / state.resultCount) * 100),
pctUploadedFeb28: ((docsByDate[state.id].feb28 / state.resultCount) * 100),
pctUploadedMar10: ((docsByDate[state.id].mar10 / state.resultCount) * 100),
votersRegistered: _.sum(puCodeRes.map(r => results[r.puCode]?.votersRegistered || 0)),
votersAccredited: _.sum(puCodeRes.map(r => results[r.puCode]?.syncedAccreditations || 0)),
ballotPapersCount: null,
totalVotesCast: _.sum(puDataResVotes.map(r => r.votesCast || 0)),
totalVotesInvalid: null,

+ 89 other calls in file

SearchPage.js

GitHub: kyunghoon5/Full-Stack

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const totalDatePickerbo = _.sumBy(
  selectedDatePicker.map((item) => _.sumBy(item.datepicker, 'qtybo'))
);

const graphYearlyTotal = _.sum(graphLine.map((item) => item.qtyshp));

const graphMonthlyTotal = _.sum(monthLine.map((item) => item.qtyshp));

//forecast

+ 29 other calls in file

gulpfile.js

GitHub: achinwo/irev-exporter

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    for await (const chunk of fileStream) {
        buf.push(chunk);
    }

    const dataGuber = JSON.parse(Buffer.concat(buf).toString());
    numResultsGuber = _.sum(dataGuber.data.map((pu) => !pu.document?.url || (url.parse(pu.document?.url).pathname === '/') ? 0 : 1) || [0]);
} catch (e) {
    console.error(`[fetchStats] error fetching ward key "${key}": ${e}`);
}

+ 9 other calls in file

server.js

GitHub: Big-Brother/bitcore-wallet-service-square

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WalletService.prototype._totalizeUtxos = function(utxos) {
  var balance = {
    totalAmount: _.sum(utxos, 'satoshis'),
    lockedAmount: _.sum(_.filter(utxos, 'locked'), 'satoshis'),
    totalConfirmedAmount: _.sum(_.filter(utxos, 'confirmations'), 'satoshis'),
    lockedConfirmedAmount: _.sum(_.filter(_.filter(utxos, 'locked'), 'confirmations'), 'satoshis'),
  };
  balance.availableAmount = balance.totalAmount - balance.lockedAmount;
  balance.availableConfirmedAmount = balance.totalConfirmedAmount - balance.lockedConfirmedAmount;

+ 19 other calls in file

helpers.js

GitHub: DucatusX/ducatus-bitcore

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  return cb();
}

if (wallet.coin == 'xrp') {
  amounts = _.isArray(amounts) ? amounts : [amounts];
  let conf =  _.sum(_.map(amounts, x =>  Number((x*1e6).toFixed(0))));
  conf =  conf + Defaults.MIN_XRP_BALANCE;
  blockchainExplorer.getBalance = sinon.stub().callsArgWith(1, null, {unconfirmed:0, confirmed: conf, balance: conf });
  return cb();
}

+ 3 other calls in file

presupuestos.js

GitHub: unahur-desapp/control-gastos-subsidios-frontend

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const calculateTotalExpenses = (compras) => {
  const gastos = compras.map((a) => parseInt(a.monto));
  if (gastos.length === 0) {
    return 0;
  }
  return _.sum(gastos || 0);
};


export { montoDisponible, nivelDeEjecucion, calculateTotalExpenses };

+ 4 other calls in file

common.js

GitHub: Bleakki/Diceperor

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rollDice,
roll: (numberOfRolls, die, threshdold = null, mod = 0) => {
  const rolls = rollDice({ die, numberOfRolls });

  let message;
  let sum = _.sum(rolls);
  message = `The result is **${sum}** (${rolls})`;
  let status = null;
  let difference = null;

common.js

GitHub: NLKNguyen/code-formation

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  // -- write file
  fs.writeFileSync(root + filepath, content, charset)
}


function isOnlyOneDefined(arr) {
  return _.sum(arr, (e) => (_.isUndefined(e) ? 0 : 1)) === 1
}


function hasTemplateInstruction(profile, line) {
  // TODO: snippet block

terminal.js

GitHub: sindeshiva/Test

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})

chars = options.chars

if (colWidths) {
  const sum = _.sum(colWidths)

  if (sum !== EXPECTED_SUM) {
    throw new Error(`Expected colWidths array to sum to: ${EXPECTED_SUM}, instead got: ${sum}`)
  }

ex2.js

GitHub: dinnf/labwork

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console.log(sum1);
//adding arr with reduce
const reducer = (accumulator, curr) => accumulator + curr;
console.log(arr.reduce(reducer));
//adding arr with lodash
var sum = _.sum(arr);
console.log(sum);
console.log("******Map keys demo********");
const map = new Map();
map.set("1", "str1"); // a string key

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