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Merge two array of objects in Javascript

By : Doris Tillotson
Date : July 31 2020, 03:00 AM
I hope this helps . You could take the arrays in an array and merge the objects by index.
This approach works for any count of arrays.
code :
let genericObj = [{"name": "success", }, {"name": "failure"}, {"name":"timeout"}, {"name": "max"}, {"name": "min"}, {"name": "avg"}],
    x = [{ y: 14037 }, { y: 0 }, { y: 0 }, { y: 1.1960000000000002 }, { y: 0.089 }, { y: 0.18 }],
    result = [genericObj, x].reduce((a, b) => a.map((o, i) => ({ ...o, ...b[i] })));

.as-console-wrapper { max-height: 100% !important; top: 0; }

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how to merge two array objects in javascript

By : noureddine hamid
Date : March 29 2020, 07:55 AM
I hope this helps . You can use one object to store ID's and reduce() to create new array of merged objects.
code :
var a = [{"ID":11021,"ASSET_NAME":"panda","SERVICE_NAME":"Open Ticket"}]
var b = [{"ID":11021,"ASSET_NAME":"panda","SERVICE_NAME":"open requests"}]
var obj = {}

var result = a.concat(b).reduce(function(r, e) {
  if (!obj[e.ID]) {
    obj[e.ID] = {
      ID: e.ID,
      service_name: []
  return r
}, [])

console.log(JSON.stringify(result, 0, 4))

Merge an array of objects and an object of objects - JavaScript

By : Manish Patil
Date : March 29 2020, 07:55 AM
This might help you I have , You can use .map(), Object.assign()
code :
const arrayOfObjects = [{
            "id": 123, // Id I want to use to map
            "date": 20172301,
            "model": 2017
            "id": 221, // Id I want to use to map
            "date": 20172301,
            "model": 2015
            "id": 1, // Id I want to use to map
            "date": 20172301,
            "model": 2012

const object = {
            "123": { // Id I want to use to map
                "id": 1, // I am also getting this Id that I don't want
                "uri": "www.google.com"
            "221": { // Id I want to use to map
                "id": 2, // I am also getting this Id that I don't want
                "uri": "www.bing.com"
let result = arrayOfObjects.map(o => 
               object[o.id] ? Object.assign({}, o, {url} = object[o.id]) : o);


How to merge array of objects in one object, including inner objects - JavaScript?

By : Madison W.
Date : March 29 2020, 07:55 AM
it should still fix some issue Suppose I have the following array of objects: , You could try the following using the reduce method:
code :
var list = [{
  a: 1,
  b: {
    a: 4,
    k: 3
}, {
  a: 1,
  s: 11,
  b: {
    ab: 4,
    d: 8

var result = list.reduce(function(acc, item) {
  var obj = { ...item
  Object.keys(obj).forEach(function(item) {
    if (acc[item]) { //if a property with the the key, 'item' already exists, then append to that
      Object.assign(acc[item], obj[item]);
    } else { // else add the key-value pair to the accumulator object.
      acc[item] = obj[item];
  return acc;
}, {})


Javascript Objects - merge an array of object with some classicals objects

By : Spinello
Date : March 29 2020, 07:55 AM
To fix this issue Just map object2 into a new array of objects. For each object in object2 create a new object that is the fusion of it with the equivalent object from object1 (retrieved using the id property):
code :
var result = object2.map(o => Object.assign({}, o, object1[o.id]));
var object1 = {"5b7973bdce3eb938a6de86a3":{"addAt":1534727291296,"quantity":1},"5b7973bdce3eb938a6de86a5":{"addAt":1534727292889,"quantity":1},"5b7973bdce3eb938a6de86a7":{"addAt":1534727297106,"quantity":1}};

var object2 = [{"id":"5b7973bdce3eb938a6de86a3","category":"main dish","ingredients":" Peeled groundnuts ↵ Onion, garlic, pepper, salt ↵ Vegetable oil ↵  Ground crayfish ↵  Meat","price":"5.50"},{"id":"5b7973bdce3eb938a6de86a5","category":"entry","ingredients":"1.2kg (2.6 lbs) goat meat (cut with the skin) ↵ 2 …g spoon vegetable oil. ↵  Black pepper (optional)","price":"6.50"},{"id":"5b7973bdce3eb938a6de86a7","category":"appetizers","ingredients":"2 cups of warm water. ↵   2 tsp. baking powder. ↵ …ar. ↵    2 tsps. vegetable oil. ↵  Pinch of salt.","price":"5.00"}];

var result = object2.map(o => Object.assign({}, o, object1[o.id]));


Merge and sum array objects Javascript

By : user2547873
Date : March 29 2020, 07:55 AM
may help you . You can use array reduce function and inside the reduce call back use findIndex to check if the accumulator array have an object with same tag. If a object with same tag is found then update the counter in that object , otherwise push the current object in the accumulator array
code :
let data = [{
    "tag": "#sala",
    "state": {
      "counter": 1
    "tag": "#sala",
    "state": {
      "counter": 2
let newData = data.reduce(function(acc, curr) {
  let findTagIndex = acc.findIndex(item => item.tag === curr.tag);
  if (findTagIndex === -1) {
  } else {
    acc[findTagIndex].state.counter += curr.state.counter
  return acc;
}, []);
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