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How to use the fromPairs function from lodash

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

lodash.fromPairs is a utility function that creates an object from an array of key-value pairs.

index.js

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sandbox.spy(TestReader, 'create');
sandbox.stub(SetCollection.prototype, 'groupByBrowser').callsFake(() => {
    const config = TestReader.create.lastCall.args[0];
    const browsers = config.getBrowserIds();
    return _.fromPairs(browsers.map((p) => [p, []]));
});

sandbox.stub(TestParser.prototype, 'loadFiles').callsFake(function() {
    this._tests = [{title: 'default-test'}];

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+ 4 other calls in file

lodash-contrib.commonjs.js

GitHub: node4good/lodash-contrib

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module.exports.forIn               = _.forIn;
module.exports.forInRight          = _.forInRight;
module.exports.forOwn              = _.forOwn;
module.exports.forOwnRight         = _.forOwnRight;
module.exports.frequencies         = _.frequencies;
module.exports.fromPairs           = _.fromPairs;
module.exports.fromQuery           = _.fromQuery;
module.exports.functionalize       = _.functionalize;
module.exports.functions           = _.functions;
module.exports.functionsIn         = _.functionsIn;

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+ 92 other calls in file

How does lodash.fromPairs work?

lodash.fromPairs is a utility function that takes an array of key-value pairs and returns an object with those keys and values. It works by iterating over the array, extracting the key and value from each element, and adding them to a new object.

progressTracking.js

GitHub: navgurukul/sansaar

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const formStructure = await PathwayFormStructure.query(txn).where(
  { pathway_id: pathwayId },
  txn
);

const existingQuestionIds = _.fromPairs(
  formStructure.map((s) => [s.question_id, s]).filter((s) => s[0])
);
const existingParamIds = _.fromPairs(
  formStructure.map((s) => [s.parameter_id, s]).filter((s) => s[0])

+ 7 other calls in file

addok.cjs

GitHub: BaseAdresseNationale/ban-plateforme

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  }
}


function buildStreet(voie, forceAddOldCity = false) {
  const commune = getCommune(voie.codeCommune)
  const housenumbers = fromPairs(voie.numeros.map(numero => [
    [numero.numero || '0', numero.suffixe].filter(Boolean).join(''),
    {
      id: numero.cleInterop,
      x: numero.x,

Ai Example

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const pairsArray = [
  ["a", 1],
  ["b", 2],
  ["c", 3],
];
const objectFromPairs = _.fromPairs(pairsArray);
console.log(objectFromPairs);
// Output: { a: 1, b: 2, c: 3 }

In this example, we have an array of pairs called pairsArray. We pass pairsArray as an argument to _.fromPairs function from the Lodash library. _.fromPairs function converts the array of pairs into an object. The resulting object is then logged to the console using console.log.

auth.js

GitHub: bcgov/EDUC-STUDENT-ADMIN

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  ]);
  const adminHelpersFE = Object.entries(roles.Admin).map(([roleType, roleName]) => [
    `isValid${roleType}Admin`, isValidUser(isUserHasAdminRole, roleType, roleName)
  ]);
  // create object { isValidGMPUser: ture, isValidUMPUser: true, isValidStudentSearchUser: false, ...}
  const isValidUsers = (req) => fromPairs(userHelpers.map(([roleType, verifyRole]) => [roleType, verifyRole(req)]));
  const isValidAdminUsers = (req) => fromPairs(adminHelpersFE.map(([roleType, verifyRole]) => [roleType, verifyRole(req)]));
  return ({...fromPairs([...userTokenHelpers, ...userHelpers, ...adminHelpers]), isValidUsers, isValidAdminUsers});
}

+ 3 other calls in file

lodash.js

GitHub: mdmarufsarker/lodash

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console.log(flattenDeep); // => [1, 2, 3, 4, 5]


const flattenDepth = _.flattenDepth([1, [2, [3, [4]], 5]], 2);
console.log(flattenDepth); // => [1, 2, 3, [4], 5]


const fromPairs = _.fromPairs([['a', 1], ['b', 2]]);
console.log(fromPairs); // => { 'a': 1, 'b': 2 }


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

+ 15 other calls in file

obfuscate-old.js

GitHub: nx-lr/32chars-js

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if (key) quoteSequence.splice(2, 1)
let quotedStrings = quoteSequence.map(quotes => [
  quotes,
  jsesc(string, {quotes, wrap: true}),
])
quotedStrings = _.fromPairs(quotedStrings)

let lengthMap = _.mapValues(quotedStrings, x => x.length)

let lengthSorted = _.toPairs(lengthMap).sort(([, a], [, b]) => a - b)

lodash.js

GitHub: bySxS/ExpressJS-knex-faker

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    _.words,
    _.countBy,
    _.toPairs,
    _.partial(_.orderBy, _, 1, 'desc'),
    _.partial(_.take, _, 7),
    _.fromPairs
])
console.log('результат обработки текста с файла = ',
    top5Words(text))

aql-graph-traversal-generic-tests.js

GitHub: arangodb/arangodb

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// check that all paths start at the same vertex
const startVertices = new Set(actualPathsVertices.map(p => p[0]));
assertTrue(startVertices.size === 1, "paths did not start at same vertex", startVertices);

// create a dict that contains maps a vertex to its predecessor
const vertexPairs = _.fromPairs(actualPathsVertices.filter(p => p.length > 1).map(p => p.slice(-2).reverse()));
// create moving windows of length 2 on all paths
const pathEdgeList = actualPathsVertices.filter(p => p.length > 1).map(p => {
  const pairs = _.zip(p, _.tail(p));
  pairs.pop();

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input-types.js

GitHub: NetsBlox/services

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baseType: "String",
parser: (str, variants) => {
  const lower = str.toLowerCase();
  const variantDict = !Array.isArray(variants)
    ? variants
    : _.fromPairs(variants.map((name) => [name, name]));

  for (const variant in variantDict) {
    if (lower === variant.toLowerCase()) return variantDict[variant];
  }

+ 3 other calls in file

gulpfile.js

GitHub: achinwo/irev-exporter

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        updatedById: 1,
    });
}

const recs = await User.query().select('display_name', 'contributor_id');
const mapping = _.fromPairs(recs.map(r => [r.contributorId, r.displayName]));
const existingContribs = _.keys(mapping);

const pus = await models.PuData.query()
    .select('contributor_username')

+ 3 other calls in file

aql-graph-traversal-generic-graphs.js

GitHub: tehila17-meet/TheAvocadoLife

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_shardAttrPerShard(col) {
  const shards = col.shards();

  // Create an array of size numberOfShards, each entry null.
  const exampleAttributeByShard = _.fromPairs(shards.map(id => [id, null]));

  const done = () => !
    _.values(exampleAttributeByShard)
      .includes(null);

gulpfile.js

GitHub: achinwo/irev-exporter

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const lgaObj = _.first(data.lgas);
const lgaDirName = _.snakeCase(lgaObj.name);
const wardObj = _.first(data.wards);
const stateRes = await models.IrevWard.query().select('state_name', 'state_id').where('ward_uid', wardObj._id);
const stateMap = _.fromPairs(stateRes.map(r => [_.toInteger(r.stateId), r.stateName]));
const stateDirName = _.snakeCase(stateMap[wardObj.state_id]);

const refdataKey = path.join(refdataDestPrefix, stateDirName, lgaDirName, fileName);
const refdataRes = await client.uploadFile(Buffer.from(JSON.stringify(data, null, 4)), {bucket: process.env.S3_BUCKET_NAME, key: refdataKey});

+ 39 other calls in file

dragnn_layout.js

GitHub: 2lambda123/Artificial-Intelligence-Deep-Learning-Machine-Learning-Tutorials

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const stepDim = this.horizontal ? 'x' : 'y';

const sorted = this.sortedComponents(partition.component);

// Computes dictionaries from old --> new component positions.
const newCompPos = _.fromPairs(_.map(sorted, (x, i) => {
  return [x[0], this.stepPosition(i, 0)];
}));

// Component --> slope for "step index --> position" function.

update.js

GitHub: cym31153/arknights-toolbox

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const avatarDir = Path.resolve(__dirname, '../public/assets/img/avatar');
const prtsHome = 'http://ak.mooncell.wiki/index.php?title=%E9%A6%96%E9%A1%B5&mobileaction=toggle_view_mobile';
const prtsURL = 'http://ak.mooncell.wiki/w/%E5%B9%B2%E5%91%98%E4%B8%80%E8%A7%88';


const sortObjectBy = (obj, fn) => _.fromPairs(_.sortBy(_.toPairs(obj), ([k, v]) => fn(k, v)));
const idStandardization = id => id.replace(/\[([0-9]+?)\]/g, '_$1');
const getPinyin = (word, style = pinyin.STYLE_NORMAL) => {
  const py = pinyin(word, {
    style,

+ 4 other calls in file

generate-contrasts.js

GitHub: bonino97/FE-KeepBetting

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{
    darkColor = chroma.contrast(color, '#FFFFFF') > chroma.contrast(darkColor, '#FFFFFF') ? color : darkColor;
}));

// Generate the contrasting colors
return _.fromPairs(_.map(palette, ((color, hue) => [
        hue,
        chroma.contrast(color, darkColor) > chroma.contrast(color, lightColor) ? darkColor : lightColor
    ]
)));

theming.js

GitHub: bonino97/FE-KeepBetting

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 *
 * @param theme
 */
const normalizeTheme = (theme) =>
{
    return _.fromPairs(_.map(_.omitBy(theme, (palette, paletteName) => paletteName.startsWith('on') || _.isEmpty(palette)),
        (palette, paletteName) => [
            paletteName,
            {
                ...palette,

+ 10 other calls in file

model.js

GitHub: tehila17-meet/TheAvocadoLife

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this.errors = {};

if (this.schema) {
  if (this.schema.isJoi) {
    this.schema = _.fromPairs(_.map(this.schema._inner.children, function (prop) {
      return [prop.key, prop.schema];
    }));
  }
  _.each(

theming.js

GitHub: angelloor/wsfe

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const theme = normalizeTheme(value);
const primary = (theme && theme.primary && theme.primary.DEFAULT) ? theme.primary.DEFAULT : normalizedDefaultTheme.primary.DEFAULT;
const accent = (theme && theme.accent && theme.accent.DEFAULT) ? theme.accent.DEFAULT : normalizedDefaultTheme.accent.DEFAULT;
const warn = (theme && theme.warn && theme.warn.DEFAULT) ? theme.warn.DEFAULT : normalizedDefaultTheme.warn.DEFAULT;

return _.fromPairs([
    [
        key,
        {
            primary,

+ 5 other calls in file

arraydemo.js

GitHub: Hupeng7/es6demo

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let flattenDepth2 = _.flattenDepth(flattenDeepArr, 2);
console.log('flattenDepth2--->', flattenDepth2);
//flattenDepth2---> [ 1, 2, 3, [ 4 ], 5 ]


//_.fromPairs(pairs)
let fromPairs1 = _.fromPairs([['a', 1], ['b', 2]]);
console.log('fromPairs1--->', fromPairs1);
//fromPairs1---> { a: 1, b: 2 }


//_.head(array)

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