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How to use the flow function from lodash

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

In JavaScript, the _.flow function in the Lodash library is used to create a new function that applies a series of functions to a value.

lodash-contrib.commonjs.js

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module.exports.flattenDeep         = _.flattenDeep;
module.exports.flattenDepth        = _.flattenDepth;
module.exports.flip                = _.flip;
module.exports.flip2               = _.flip2;
module.exports.floor               = _.floor;
module.exports.flow                = _.flow;
module.exports.flowRight           = _.flowRight;
module.exports.fnull               = _.fnull;
module.exports.forEach             = _.forEach;
module.exports.forEachRight        = _.forEachRight;

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+ 92 other calls in file

toPgn.js

GitHub: canboat/canboatjs

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const actisenseToYdgwRawFormat = _.flow(parseActisense, encodeYDRAW)
const actisenseToPCDIN = _.flow(parseActisense, encodePCDIN)
const actisenseToMXPGN = _.flow(parseActisense, encodeMXPGN)
const actisenseToiKonvert = _.flow(parseActisense, encodePDGY)
const actisenseToN2KAsciiFormat = _.flow(parseActisense, encodeActisenseN2KACSII)
const actisenseToN2KActisenseFormat = _.flow(parseActisense, encodeN2KActisense)


fieldTypeWriters['ASCII text'] = (pgn, field, value, bs) => {


  let fill = 0xff

+ 5 other calls in file

How does lodash.flow work?

_.flow is a function in the Lodash library for JavaScript that creates a new function that applies a series of functions to a value.

When _.flow is called with one or more functions as input, it performs the following operations:

It returns a new function that applies the input functions to a value in sequence.
When the new function is called with a value as input, it applies the first function to the value and passes the result to the next function in the sequence.
This process is repeated for each function in the sequence, with the output of the previous function being passed as input to the next function.
The final output of the sequence is returned as the result of the new function.

By using _.flow, developers can easily create complex functions that apply a series of operations to a value. This can be useful for transforming or processing data in a consistent and predictable way. Note that _.flow should be used with caution, as it can make code difficult to read and debug if used excessively or improperly.

index.js

GitHub: sluukkonen/iiris

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name: 'pipe',
benchmarks: () => {
  const inc = (x) => x + 1
  return {
    iiris: () => I.pipe(1, inc, inc, inc, inc),
    lodash: () => _.flow([inc, inc, inc, inc])(1),
    ramda: () => R.pipe(inc, inc, inc, inc)(1),
    native: () => inc(inc(inc(inc(1)))),
  }
},

build.js

GitHub: natecavanaugh/github-pulls

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const log = _.flow(util.format, chalk.green, console.log);


_.forOwn(
	chalk.styles,
	(item, index) => {
		log[index] = _.flow(util.format, chalk[index], console.log);
	}
);


const argv = require('yargs')

+ 5 other calls in file

Ai Example

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const _ = require("lodash");

// Applying a series of functions to a value
function square(n) {
  return n * n;
}

function double(n) {
  return n * 2;
}

const processNumber = _.flow(square, double);

console.log(processNumber(5)); // Outputs: 50

In this example, we're using _.flow to create a new function, processNumber, that applies the square and double functions to a value. We provide the two functions as input to _.flow, which returns a new function that applies the functions in sequence. When we call processNumber with a value of 5, the square function squares the value, resulting in 25. The double function then doubles the value, resulting in 50. The final output, 50, is returned as the result of processNumber. Note that in this example, we're passing the two functions directly to _.flow, which creates a new function that applies the functions in sequence. The resulting function can then be called with a value as input, which is transformed by each function in turn.

lodash.js

GitHub: mdmarufsarker/lodash

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


const defaultTo = _.defaultTo(1, 10);
console.log(defaultTo); // => 1


const flow = _.flow([function(n) { return n * 3; }, function(n) { return n + 1; }]);
console.log(flow(1)); // => 4


const flowRight = _.flowRight([function(n) { return n * 3; }, function(n) { return n + 1; }]);
console.log(flowRight(1)); // => 4

+ 15 other calls in file

hacking.js

GitHub: LeekAnarchism/hacking-of-the-dead

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const byteify = (exploded) => {
	return exploded.flatten().map(c => c.toString(16)).join(' ');
}


// Convert bytes of entire file to readable format
const transform = _.flow(explode, translate, implode);
// Convert bytes of readable format back to game format
const untransform = _.flow(explode, untranslate, implode);
// Perform alphanumeric changes to translated text
const modify = fn => _.flow(explode, x => x.map(l => modifyLine(l,fn)), implode);

+ 5 other calls in file

test.js

GitHub: LeekAnarchism/hacking-of-the-dead

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lodash.js

GitHub: bySxS/ExpressJS-knex-faker

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//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
//_.sum - суммируем
logger.info('сумма чисел массива вложенного = ' + sumFlat(notFlatArray))

query-builers.js

GitHub: Tr14/test_webhook_v4

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  const query = rulesToQuery(ability, action, model, o => o.conditions);
  return _.get(query, '$or[0].$and', {});
};


const buildStrapiQuery = caslQuery => {
  const transform = _.flow([flattenDeep, cleanupUnwantedProperties]);
  return transform(caslQuery);
};


const flattenDeep = condition => {

index.js

GitHub: mariaborjaarteaga/constructorAPI

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const { flow, camelCase, upperFirst, lowerCase } = require('lodash');
const fileExistsInPackages = require('../utils/fileExistsInPackages');
const getPluginList = require('../utils/getPluginList');
const packagesFolder = require('../utils/packagesFolder');


const pascalCase = flow(camelCase, upperFirst);


const prompts = [
  {
    type: 'list',

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