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How to use the flattenDeep function from lodash

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

lodash.flattenDeep is a utility function that recursively flattens a nested array to a single level array.

index.js

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//     if(element.router.default === require('@steedos/router').staticRouter()){
//         objectql.broker.broker.logger.warn(`router error, packagePath: ${packagePath} `);
//     }
// });

let routersInfo = _.flattenDeep(_.map(routersData, 'infoList'));
if(oldRoutersInfo){
    _.each(oldRoutersInfo.metadata, (info)=>{
        const _info = _.find(routersInfo, (item)=>{
            return item.path == info.path && JSON.stringify(item.methods) == JSON.stringify(info.methods) && item.md5 == info.md5

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db-doc.spec.js

GitHub: medic/cht-core

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  results.forEach((result, key) => (docs[key]._rev = result.rev));
  return Promise.all(docs.map(doc => utils.requestOnTestDb(`/${doc._id}?rev=${doc._rev}&revs=true`)));
})
.then(results =>
  Promise.all(
    _.flattenDeep(
      results.map(result => {
        const open_revs = result._revisions.ids.map((rev, key) => `${result._revisions.start - key}-${rev}`);
        const path = `/${result._id}?rev=${result._rev}&open_revs=${JSON.stringify(open_revs)}`;
        const pathAll = `/${result._id}?rev=${result._rev}&open_revs=all`;

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+ 7 other calls in file

How does lodash.flattenDeep work?

lodash.flattenDeep works by taking an array as an argument and recursively flattening any nested arrays within the input array to a single level array. The function uses a recursive algorithm to traverse the input array and its nested arrays. For each element in the array, it checks whether the element is an array. If the element is an array, the function recursively calls itself on the element and concatenates the result with the flattened array. If the element is not an array, it is simply pushed into the flattened array. The function continues to traverse and flatten nested arrays until no more arrays are found. The resulting flattened array is returned by the function. lodash.flattenDeep is a useful utility function for working with nested arrays in JavaScript, particularly when dealing with complex data structures or multi-dimensional arrays.

lodash-contrib.commonjs.js

GitHub: node4good/lodash-contrib

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module.exports.fix                 = _.fix;
module.exports.flatMap             = _.flatMap;
module.exports.flatMapDeep         = _.flatMapDeep;
module.exports.flatMapDepth        = _.flatMapDepth;
module.exports.flatten             = _.flatten;
module.exports.flattenDeep         = _.flattenDeep;
module.exports.flattenDepth        = _.flattenDepth;
module.exports.flip                = _.flip;
module.exports.flip2               = _.flip2;
module.exports.floor               = _.floor;

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+ 92 other calls in file

lodash.js

GitHub: mdmarufsarker/lodash

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console.log(firstHead); // => 1


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


const flattenDeep = _.flattenDeep([1, [2, [3, [4]], 5]]);
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]

+ 15 other calls in file

Ai Example

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const _ = require("lodash");

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

const flattenedArray = _.flattenDeep(nestedArray);

console.log(flattenedArray);

In this example, we have a nested array nestedArray that contains four levels of nesting. We use the lodash.flattenDeep function to flatten the nested array to a single level array. The resulting flattenedArray should contain all the elements of the original nestedArray flattened to a single level, as follows: javascript Copy code

controller.js

GitHub: SparrowAcst/sync-data

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	  }         


	})


	return {
	  labelRecords: flattenDeep(rows.map( r => r.labelRecords)),
	  formRecords: uniqBy(flattenDeep(rows.map( r => r.formRecords)), f => f.id)
	}


}

+ 2 other calls in file

programHelper.js

GitHub: agamdahiya/contribute

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        _.forEach(unit.contentTypes, type => final[type.name] = (final[type.name] || 0) + type.count);
        return final;
      });
      return unitDetails;
    });
    return _.flattenDeep(tableObj);
  } else {
    return {}
  }
});

client.js

GitHub: KMCControls/influxdb-nodejs

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 * // => [ 'telegraf', '_internal', 'mydb' ]
 */
showDatabases() {
  const ql = InfluxQL.showDatabases();
  const { influx } = internal(this);
  return influx.query(ql).then(data => _.flattenDeep(util.mergeValues(data)));
}

/**
 * Create retention policy

+ 2 other calls in file

index.js

GitHub: itspasindu/javascript-chatbot-new

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allQustions = _.concat(allQustions, wikipediaChat);
allQustions = _.concat(allQustions, unitConverterChat);
allQustions = _.concat(
  allQustions,
  _.flattenDeep(_.map(supportChat, "questions")),
);
allQustions = _.concat(
  allQustions,
  _.flattenDeep(_.map(mainChat, "questions")),

+ 3 other calls in file

arraydemo.js

GitHub: Hupeng7/es6demo

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let flatten1 = _.flatten([1, [2, [3, [4]], 5]]);
console.log('flatten1--->', flatten1);
//flatten1---> [ 1, 2, [ 3, [ 4 ] ], 5 ]


//_.flattenDeep(array,)
let flattenDeep1 = _.flattenDeep([1, [2, [3, [4]], 5]]);
console.log('flattenDeep1--->', flattenDeep1);
//flattenDeep1---> [ 1, 2, 3, 4, 5 ]


//_.flattenDepth(array,[depth=1])

app.js

GitHub: khushwantD/node-tutorial-1

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const newItems = _.flattenDeep(items);
console.log(newItems);

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