CODEWITHSUNDEEP
javascript
Neeraj
Neeraj

Reputation: 58

Array insertion JavaScript

I have a use case as follows

var myObject1 = new myObject();

and myObject should have an array which will store all the objects created of this myObject

Example:-

if create an object such as

var xyz = new myObject();
myObject.all[0] == xyz

is there any way where - when I create an object & I can push it into an array which is in the definition of same object.

Upvotes: 0

Views: 45

Answers (2)

nnnnnn
nnnnnn

Reputation: 150030

You can create a property directly on the constructor function, to get the myObject.all[0] == xyz behaviour mentioned in the question. Add each object to the array from within the constructor:

function MyObject() {
  MyObject.all.push(this);
  // any other initialisation tasks here
}
MyObject.all = [];
    
var obj1 = new MyObject();
var obj2 = new MyObject();
    
// to access the array use MyObject.all:
console.log(MyObject.all[1] === obj2);  // true

Alternatively, you can add an array to the object prototype, but still add new objects to that array from within the constructor:

function MyObject() {
  this.all.push(this);
  // any other initialisation tasks here
}
MyObject.prototype.all = [];

var obj1 = new MyObject();
var obj2 = new MyObject();

// to access the array:
console.log(obj1.all);
// or
console.log(MyObject.prototype.all);

console.log(obj1.all[1] === obj2); // true

(Note: in both examples, I've spelled MyObject with a capital "M", because it is a JS convention for functions intended as constructors to be capitalised. This isn't mandatory.)

Upvotes: 4

d-_-b
d-_-b

Reputation: 23171

Maybe something like this?

function MyObject(name){
   if (!O.prototype.instances) O.prototype.instances = [];
   O.prototype.instances.push(name);
}


var a = MyObject('a');
var b = MyObject('b');

console.log(MyObject.prototype.instances)

Upvotes: 0

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