Merge into object array from object by key

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My goal is to update an object array by matching an id with another object containing a matching key to update the object array's value key.

Working with an object array like:

const objArr = [
  {
    id: 6,
    name: 'Activity Attendance',
    type: 'Number',
    value: '2000',
    nameChanged: false,
    typeChanged: false,
    internalName: 'activity_attendance'
  },
  {
    id: 123,
    name: 'Total Number of Interacted Consumers',
    type: 'Number',
    value: '400',
    nameChanged: false,
    typeChanged: false,
    internalName: 'total_number_of_interacted_consumers'
  },
  {
    id: 140,
    name: 'Booth Location',
    type: 'Select (Single Answer)',
    value: '',
    nameChanged: false,
    typeChanged: false,
    internalName: 'booth_location'
  }
];

And an object like:

const obj = {
  '6': '1500',
  '123': '180',
  '140': ''
};

Desired outcome:

const objArr = [
  {
    id: 6,
    name: 'Activity Attendance',
    type: 'Number',
    value: '1500',
    nameChanged: false,
    typeChanged: false,
    internalName: 'activity_attendance'
  },
  {
    id: 123,
    name: 'Total Number of Interacted Consumers',
    type: 'Number',
    value: '180',
    nameChanged: false,
    typeChanged: false,
    internalName: 'total_number_of_interacted_consumers'
  },
  {
    id: 140,
    name: 'Booth Location',
    type: 'Select (Single Answer)',
    value: '',
    nameChanged: false,
    typeChanged: false,
    internalName: 'booth_location'
  }
];

I have started down the route of mapping the objArr, but am not sure of how to proceed to make the "match" within obj to get the correct value to update. My failing attempt:

objArr.map(i => i.id.includes(Object.keys(obj).map(o => Number(o))));

How can I can merge into an array of objects from an object?


Here is solution using map() function and spread (...) operator:

var objArr = [
  {
    id: 6,
    name: 'Activity Attendance',
    type: 'Number',
    value: '2000',
    nameChanged: false,
    typeChanged: false,
    internalName: 'activity_attendance'
  },
  {
    id: 123,
    name: 'Total Number of Interacted Consumers',
    type: 'Number',
    value: '400',
    nameChanged: false,
    typeChanged: false,
    internalName: 'total_number_of_interacted_consumers'
  },
  {
    id: 140,
    name: 'Booth Location',
    type: 'Select (Single Answer)',
    value: '',
    nameChanged: false,
    typeChanged: false,
    internalName: 'booth_location'
  }
];

var obj = {
  '6': '1500',
  '123': '180',
  '140': ''
};

console.log(objArr.map(i => ({
  ...i,
  value: obj[i.id] ? obj[i.id] : i.value 
})))

How to merge two objects in JavaScript, JavaScript merge array of objects by key (es6) const arr1 =[ {id:1,name:"sai"}, {id:2,name: "King"} ]; const arr2 = [ {id:1,age:23}, {id:2,age:24} ]; function mergeArrayObjects(arr1,arr2){ return arr1. map((item,i)=>{ if(item. id === arr2[i]. function mergeArrayObjects(arr1,arr2){ let start = 0; let merge = []; while( 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. Note: Both arrays should be the same length to get a correct answer. First way. Here we are the using map method and Object.assign method to merge the array of objects by using id.


If you are okay with modifying the original array, this will do the trick:

Just loop through the original object and check if there is an update

objArr.forEach(o=>{
    if( obj[o.id] )
        o.value = obj[o.id]
});

Example:

var objArr = [
  {
    id: 6,
    name: 'Activity Attendance',
    type: 'Number',
    value: '2000',
    nameChanged: false,
    typeChanged: false,
    internalName: 'activity_attendance'
  },
  {
    id: 123,
    name: 'Total Number of Interacted Consumers',
    type: 'Number',
    value: '400',
    nameChanged: false,
    typeChanged: false,
    internalName: 'total_number_of_interacted_consumers'
  },
  {
    id: 140,
    name: 'Booth Location',
    type: 'Select (Single Answer)',
    value: '',
    nameChanged: false,
    typeChanged: false,
    internalName: 'booth_location'
  }
];

var obj = {
  '6': '1500',
  '123': '180',
  '140': ''
};

// loop through the array of objects
objArr.forEach(o=>{

    // see if there is an update in the `obj` var
    if( obj[o.id] )
        o.value = obj[o.id] // apply the update
});

console.log(objArr)

JavaScript concat() Method : Array Object, Merging of two or more objects; Merging of object into an Array; Merging two arrays; Union of objects based on unique key; Union of objects in  How to convert an Array of key-values to an Object. There is an Array of [key, value] elements: const arr = [ ["key1", "value1"], ["key2", "value2"] ]; How to convert it to an Object that has all the keys with the associated values? Use Object.assign. Convert the Array to multiple Objects having only one property, and then merge them into a


In plain javascript I would do something like this

objArr.forEach(element => {
  let value = obj[parseInt(element.id)];
  if(value){
    element.value = value;
  }
});

How do I merge two arrays of objects in typescript? You can convert an array into an object using one of these three methods: The Object.assign()function. Loop over the array and construct a new object. The reduce()function. We'll go over each of those methods in this article and provide some code examples for you to use on your website or application.


(numeric); console. log("alphaNumeric : " + alphaNumeric ); On compiling, it will generate the same code in JavaScript. array-merge-by-key Effectively merge arrays of objects into a single array by merging objects with the same key (property). Also use this module to merge objects with the same property value in one array. This is a micro module, which includes light and well-tested code.


You can use the following example to solve your problem:

objArr.forEach(i => i.value = Object.keys(obj).includes(String(i.id)) ? obj[i.id]: i.value);

It allows the privilege to obtain a list of parameters from an array. Javascript objects are key-value paired dictionaries. We can merge different objects into one  The Object.fromEntries () method takes a list of key-value pairs and returns a new object whose properties are given by those entries. The iterable argument is expected to be an object that implements an @@iterator method, that returns an iterator object, that produces a two element array-like object, whose first element is a value that will be


Find out how to merge 2 JavaScript objects and create a new object that a deeper merge, recursively merging object properties and arrays. Java merge objects Java merge objects. Here is my code for illustration: for(int i=0;i


When we have two separate array and we want to make key value pair from that two array, we can use array's reduce function like below: var columns = ["Date"  In this post, we will discuss how to merge arrays of same type into single a new Object array using Java 8, System.arraycopy(), Java Collections, Guava and Apache Commons Lang. The new array should maintain the original order of elements in individual arrays and all elements of the first array should precede all elements of the second array. 1.


But the main difference is that Map allows keys of any type. If your object property is of any kind it will work with Map :D. First consider making  The Object.assign () method only copies enumerable and own properties from a source object to a target object. It uses [ [Get]] on the source and [ [Set]] on the target, so it will invoke getters and setters. Therefore it assigns properties versus just copying or defining new properties. This may make it unsuitable for merging new properties