How to use the flatMapDeep function from lodash

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

lodash.flatMapDeep is a method in the Lodash library that recursively maps and flattens an array using a provided function.

lodash-contrib.commonjs.js

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module.exports.findLastKey         = _.findLastKey;
module.exports.first               = _.first;
module.exports.firstExisting       = _.firstExisting;
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;

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+ 92 other calls in file

lodash.js

GitHub: mdmarufsarker/lodash

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console.log(findLast); // => 6


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


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


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

+ 15 other calls in file

How does lodash.flatMapDeep work?

lodash.flatMapDeep is a function in the Lodash library that iterates over a collection, flattens it recursively, and maps each element using a given function. It behaves the same as lodash.flatMap, but it also flattens nested arrays recursively.

flatmapdeep.js

GitHub: justsimplycoder/vanilla-javascript-vs-underscore-lodash

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/**
 * flatMapDeep - Этот метод подобен _.flatMap, за исключением того, что он рекурсивно сглаживает сопоставленные результаты.
 */


// lodash
console.log("lod.flatMapDeep([1, 2], n => [n, n])", lod.flatMapDeep([1, 2], n => [n, n]));
console.log("lod.flatMapDeep([1, [2]], n => n)", lod.flatMapDeep([1, [2]], n => n));
console.log("lod.flatMapDeep([1, [2, [3]]], n => n)", lod.flatMapDeep([1, [2, [3]]], n => n));


// es6

+ 8 other calls in file

app.js

GitHub: PedraNosRins/temp-node-tut

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const items = [1,[2,[3,[4]]]]
const newItems = _.flatMapDeep(items);
console.log(newItems)

+ 3 other calls in file

Ai Example

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const arr = [1, [2, [3, [4]], 5]];
const flattenedArr = _.flatMapDeep(arr);
console.log(flattenedArr); // [1, 2, 3, 4, 5]

In this example, lodash.flatMapDeep is used to recursively flatten a nested array arr. The resulting flattened array is assigned to the variable flattenedArr and logged to the console.

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