Adding array of objects into single array

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I am trying to push array of objects from an existing object to a new array. But only the last value is getting pushed

Ex: Instead of getting 1 2 3 as output, I am getting 3 3 3

var arr=[{'id':'1','name':'xyz'},{'id':'2','name':'pqr'},{'id':'3','name':'mon'}];
var toSend=[];
var obj={'id':""};
for(var i=0;i<arr.length;i++) {
    obj.id = arr[i].id;
  toSend.push(obj);
}

Fiddle link

You push the same object reference to the array. By using new objects, all obejcts are different.

var arr = [{ id: '1', name: 'xyz' }, { id: '2', name: 'pqr' }, { id:'3', name: 'mon' }],
    toSend = [],
    obj;

for (var i = 0; i < arr.length; i++) {
    obj = { id: arr[i].id };
    toSend.push(obj);
}

console.log(toSend);

How to add an object to an array in JavaScript ?, The push() method adds one or more elements to the end of an array Although strings are native, Array-like objects, they are not suitable in  My problem is that unlike in Python where you can add almost anything to an array (e.g x = ["jj" , 1, 2.3, 'G', foo]) you can add only one type of objects in a C# array (int[] x = {1,2,3};) . Are there any dynamic arrays (similar to the ArrayList() class) or something which allows you to pack different types into a single array? because all the

Your code is almost right and it needs the corrections as @Nina already mentioned in her answer.

But if you want a better approach to do this, Array#map is what you need. Here are the benefits it offers:

  1. It implicitly loops over the array. So you don't need to write your own for loop.
  2. It implicitly returns a new object. So you don't need to declare and use new objects in the loop.
  3. It provides more functional approach towards the task you want to do.

var arr = [{
  'id': '1',
  'name': 'xyz'
}, {
  'id': '2',
  'name': 'pqr'
}, {
  'id': '3',
  'name': 'mon'
}];

var toSend = arr.map(item => item.id);
console.log(toSend);

How to access an array in an object in JS, Ideally, we would like to group these together into a single value and then put those grouped values into an array of log entries. Values of the type object are  Yes you are right. but if you just want to merge two arrays then you can use above mentioned one line simple solution. As question title says "Merge 2 arrays of objects". Simply use 'Array.prototype.push.apply(arr1,arr2); ' If you want to merge 2 arrays of objects in JavaScript.

You can also use Array.map() with array destructuring:

var arr=[{'id':'1','name':'xyz'},{'id':'2','name':'pqr'},{'id':'3','name':'mon'}];
var toSend = arr.map(({id}) => ({id}));
console.log(toSend);

How to Add, Modify, or Access JavaScript Object Literal Properties, The push() method is used to add one or multiple elements to the end of an array. It returns the new length of the array formed. An object can be inserted by  I noticed that, however I appended the new object to the old file, so technically I have bunch of objects in my file. FileOutputStream fos = new FileOutputStream(path, true); While this technically does append to the end of a file, and works great with text files, I really don't think that this will work or work well with serialization.

var variable obj needs to be declared inside for loop

Also stop using var and start using let. The recommendations from ES is to use let rather than using var. because var has window scope whereas let has block level scope

for(let i=0;i<arr.length;i++) {
     let obj= {};
     obj.id = arr[i].id;
     toSend.push(obj);
}

Or you can also use map

 arr.map((data, i) => {
     let obj= {};
     obj.id = data.id;
     toSend.push(obj);
}

Sorry if there are syntax errors because I am answering from mobile :)

Array.prototype.push(), Arrays. Objects allow you to store keyed collections of values. Or add a new one to the array: Add the element to the beginning of the array:. First of all, there is no object or array. There are Object and Array. Secondly, you can do that: a = new Array(); b = new Object(); a[0] = b; Now a will be an array with b as its only element.

Data Structures: Objects and Arrays :: Eloquent JavaScript, JavaScript arrays are used to store multiple values in a single variable. The typeof operator in JavaScript returns "object" for arrays. But, JavaScript arrays are The easiest way to add a new element to an array is using the push() method:  So, as you can see I have array of objects and I want to use label property to show it in a textarea. Now I see [object Object]. If I change options to simple string array, like: ['Option 1', 'Option 2'], then all works fine. But I need to use objects. So, instead of: <textarea [formControlName]="i"></textarea> I have tried:

Arrays, I think other people confused “adding multiple objects” with “adding individual objects one by one”. What you want is to add multiple objects/items to an array. Powershell: Everything you wanted to know about arrays. Arrays are a fundamental language feature of most programming languages. They are a collection of values or objects and are therefore, difficult to avoid. Let’s take a close look at arrays and everything they have to offer.

JavaScript Arrays, Here are 2 ways to combine your arrays and return a NEW array. Here are 2 ways to Merge Array with Push 🤔; Browser Support; Resources array. Which one should I pick? Named Parameters using JavaScript Destructured Objects  The array unshift method is used to add elements to the beginning of an array. It accepts multiple arguments, adjusts the indexes of existing elements, and returns the new length of the array. The unshift method modifies the array on which it is invoked.