Javascript Merge An Array Of Objects By Key Example Code * merges two arrays of objects (`arraya` and `arrayb`) into one, resolving conflicts based on a key returned by the `callbackfn`. * for objects with the same key, properties from the objects in the second array (`arrayb`) overwrite those in the first (`arraya`). In this tutorial, we are going to learn about how to merge an array of objects by using key in javascript. suppose we have two array of objects with the same key. example: now we need to merge the two array of objects into a single array by using id property because id is the same in both array objects.
Javascript Merge Array Of Objects By Key Es6 Syntax: let result = array1.map(obj => { let matchingobj = array2.find(o => o.id === obj.id); return matchingobj ? { obj, matchingobj } : obj; }); example : this code combines the users and preferences arrays by merging objects with matching id values, resulting in a unified array with combined properties. Use the map function or push () method with a loop to merge an array of objects by key in javascript. the final array will only contain id’s that matches both arrays. simple example code.