How to use the meanBy function from lodash

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

lodash.meanBy is a function that calculates the mean value of an array of objects based on a specified property.

lodash-contrib.commonjs.js

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module.exports.matches             = _.matches;
module.exports.matchesProperty     = _.matchesProperty;
module.exports.max                 = _.max;
module.exports.maxBy               = _.maxBy;
module.exports.mean                = _.mean;
module.exports.meanBy              = _.meanBy;
module.exports.memoize             = _.memoize;
module.exports.merge               = _.merge;
module.exports.mergeWith           = _.mergeWith;
module.exports.method              = _.method;

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+ 92 other calls in file

lodash.js

GitHub: mdmarufsarker/lodash

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console.log(maxBy); // => { 'n': 2 }


const mean = _.mean([4, 2, 8, 6]);
console.log(mean); // => 5


const meanBy = _.meanBy([{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }], o => o.n);
console.log(meanBy); // => 5


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

+ 15 other calls in file

How does lodash.meanBy work?

lodash.meanBy is a function provided by the Lodash library that calculates the mean value of an array of objects based on a specified property.

To use lodash.meanBy, you pass an array of objects as the first argument, and a function or string that specifies the property to use for the mean calculation as the second argument.

For example, if you have an array of objects with a value property, you can calculate the mean value of this property using lodash.meanBy like this:

javascript
const _ = require('lodash');

const values = [
  { value: 2 },
  { value: 4 },
  { value: 6 },
  { value: 8 }
];

const meanValue = _.meanBy(values, 'value');

console.log(meanValue); // 5

In this example, we are using lodash.meanBy to calculate the mean value of the value property of the values array.

We pass the values array as the first argument and the string 'value' as the second argument, which specifies that we want to calculate the mean based on the value property of each object in the array.

The lodash.meanBy function then returns the mean value of the value property, which is 5 in this case.

The lodash.meanBy function is useful for situations where you need to calculate the mean value of a specific property across a large number of objects, such as when working with data sets or statistical calculations.

user.js

GitHub: nazariifenii/liftrics-server

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});
if (order.status === "Closed") {
  return res.status(404).send({ error: "This order already closed" });
}
user.ratingsList = user.ratingsList.concat(req.body.leftRating);
user.userTotalRating = _.meanBy(user.ratingsList, p => Number(p));
order.status = "Closed";
await user.save();
await order.save();
res.send(order);

+ 4 other calls in file

wheel.js

GitHub: zarpilla/sismograf-backend

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resilienceLevel: _.meanBy(domainRows, "resilienceLevel"),
principles: _(domainRows)
  .groupBy("principleName")
  .map((principleRows, id) => ({
    principleName: id,
    resilienceLevel: _.meanBy(principleRows, "resilienceLevel"),
    patterns: _(principleRows)
      .groupBy("patternName")
      .map((patternsRows, id) => ({
        patternName: id,

+ 479 other calls in file

Ai Example

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const _ = require("lodash");

const data = [
  { name: "Alice", score: 90 },
  { name: "Bob", score: 80 },
  { name: "Charlie", score: 70 },
  { name: "David", score: 60 },
  { name: "Eve", score: 50 },
];

const meanScore = _.meanBy(data, "score");

console.log(meanScore); // 70

In this example, we have an array of objects representing student data, with each object containing a name and a score property. We use lodash.meanBy to calculate the mean score of the students by passing the data array as the first argument and the string 'score' as the second argument, which specifies that we want to calculate the mean based on the score property of each object in the array. The lodash.meanBy function then returns the mean score, which is 70 in this case. This example demonstrates how lodash.meanBy can be used to quickly and easily calculate the mean value of a specific property across a large number of objects.

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