How to Filter Object by Values in Lodash?

Sometimes we are given an object and we want to extract only the key-value pairs that meet certain criteria. In this article, we are going to discuss how we can filter objects by values in Lodash.

Prerequisite

• Lodash: Lodash is a popular JavaScript library used to deal with a variety of functions such as arrays, objects, strings, and more.

Install Lodash

We can install the Lodash library in the project by adding it via CDN or npm using the following command:

npm install lodash

Approaches to Filter Object by Values

• Using _.pickBy Method
• Using _.filter with Object.keys
• Using JavaScript Object.entries and Object.fromEntries

Using _.pickBy Method

In this approach, we use the _.pickBy method to filter objects by values. This method takes an object and a predicate function, iterates over each key-value pair, and includes only those entries for which the predicate returns true. It is the most straightforward approach when working with Lodash.

Syntax

_.pickBy(object, predicate)

Example

const _ = require('lodash');

const students = { ayush: 85, anshu: 92, smrita: 45, antima: 74 };

// Filter values greater than 80
const filteredStudents = _.pickBy(students, (value) => value > 80);

console.log(filteredStudents);

{ ayush: 85, anshu: 92 }

Using _.filter with Object.keys

This approach combines lodash _.filter with JavaScript's Object.keys to filter an object by its values. We first retrieve all the keys of the object, then filter those keys based on their associated values. Finally, we reconstruct the object using _.fromPairs.

Example

const _ = require('lodash');

const students = { ayush: 85, anshu: 92, smrita: 45, antima: 74 };

// Filter values greater than 80
const filteredKeys = Object.keys(students).filter((key) => students[key] > 80);
const filteredStudents = _.fromPairs(filteredKeys.map((key) => [key, students[key]]));

console.log(filteredStudents);

{ ayush: 85, anshu: 92 }

Using JavaScript Object.entries and Object.fromEntries

In this method, we use native JavaScript methods without requiring Lodash. Object.entries converts the object into an array of key-value pairs, which can be filtered using Array.filter. The resultant array is then converted back into an object using Object.fromEntries.

Example

const students = { kalpana: 85, neeraj: 92, aditi: 45, srishti: 74 };

// Filter values greater than 80
const filteredStudents = Object.fromEntries(
    Object.entries(students).filter(([key, value]) => value > 80)
);

console.log(filteredStudents);

{ kalpana: 85, neeraj: 92 }

Comparison

Conclusion

For filtering objects by values, _.pickBy is the cleanest Lodash approach, while Object.entries with Object.fromEntries provides a native JavaScript solution without external dependencies. Choose based on whether you're already using Lodash in your project.