How to Merge Arrays of Objects in JavaScript: A Comprehensive Guide

Merging Arrays of Objects in JavaScript: A Comprehensive Guide

Merging arrays of objects is a common challenge in JavaScript programming. This article explores various methods to merge two arrays of objects, ensuring that the properties and values of each object are preserved.

One method for merging arrays of objects is to use the Array.prototype.push.apply method. This method merges the elements of one array into another, effectively concatenating them. For example, to merge arr1 and arr2 as provided in the question:

Array.prototype.push.apply(arr1, arr2);

This will result in arr1 containing the merged objects:

arr1: [
  { name: "lang", value: "English" },
  { name: "age", value: "18" },
  { name: "childs", value: "5" },
  { name: "lang", value: "German" }
]

Another approach is to use the Object.assign method to merge the properties of two objects into a new object. However, this method does not preserve the order of the objects in the merged array. Instead, it creates a new array with the merged properties.

Lastly, it is important to note that merging arrays of objects can lead to duplicate properties if objects with the same name property exist in both arrays. In such cases, the value of the property in the first array will be overwritten by the value in the second array.

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