How to Merge Array of Objects by Property using Lodash? Last Updated : 22 Aug, 2024 Comments Improve Suggest changes Like Article Like Report Merging an array of objects by property using Lodash is a common operation when you need to consolidate data that share a common identifier. For example, if you have a list of user objects and you want to combine them into a single object based on a unique property, Lodash provides useful functions to simplify this process.Below are different approaches to merging objects in an array by a specific property using Lodash:Table of ContentUsing _.merge( ) and _.groupBy ( )Using _.keyBy ( ) and _.assign ( )Using _.merge( ) and _.groupBy ( )In this approach, we first group the objects in the array based on a common property using _.groupBy ( ). Then, we merge the objects within each group using _.merge ( ). This method is useful when we have multiple objects that should be combined into one based on a shared key.Syntax:const groupedObjects = _.groupBy(array, 'property');const mergedObjects = _.mapValues(groupedObjects, group => _.merge({}, ...group));Example: This code groups an array of student objects by their id and merges the objects within each group into a single object, consolidating information for each student. JavaScript // Import lodash using CommonJS require const _ = require('lodash'); const students = [ { id: 1, name: 'Geek', grade: 'A' }, { id: 2, name: 'Geekina', grade: 'B' }, { id: 1, sports: 'Soccer' }, { id: 2, sports: 'Basketball' } ]; // Group students by 'id' const groupedStudents = _.groupBy(students, 'id'); // Merge objects within each group const mergedStudents = _.mapValues(groupedStudents, group => _.merge({}, ...group)); console.log(mergedStudents); Output: Using _.keyBy ( ) and _.assign ( )In this approach, we first use _.keyBy ( ) to turn the array of objects into an object, where each key is the value of the specified property. Then, we use _.assign ( ) or _.merge ( ) to combine these objects. This method is efficient and works well when we want to quickly merge objects by a property.Syntax:const keyedObjects = _.keyBy(array, 'property');const mergedObject = _.assign({}, keyedObjects);Example: This code keys an array of student objects by their id and merges the keyed objects into a single object, consolidating the information for each student. JavaScript // Import lodash using CommonJS require const _ = require('lodash'); const students = [ { id: 1, name: 'Geek', grade: 'A' }, { id: 2, name: 'Geekina', grade: 'B' }, { id: 1, sports: 'Soccer' }, { id: 2, sports: 'Basketball' } ]; // Key the students by 'id' const keyedStudents = _.keyBy(students, 'id'); // Merge the keyed student objects const mergedStudent = _.assign({}, keyedStudents); console.log(mergedStudent); Output:How to Merge Array of Objects by Property using Lodash? 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