Creating a clone of a JavaScript object based on an already existing JavaScript object

Question

Creating a clone of a JavaScript object based on an already existing JavaScript object

Can someone help me with this coding issue?

var originalObject = {
    method1: function() {
        // Do something
    },
    method2: ['a','b','c'],
    method3: 1234
}

I am trying to create a new object based on the original one like so:

var newObject = Object.create(originalObject);

However, the properties of the original object do not seem to be reflected in the new object. What could be causing this issue?

javascript

Answer 1

Answer №1

If you want to create a clone function, you can do so by following this example:

var makeClone = function(object) {

    // Create a new object with the same prototype as the original object
    var clonedObject = Object.create(object);      

    // Copy each property from the original object to the cloned object
    for (property in object) {      
        if (object.hasOwnProperty(property)) {
            clonedObject[property] = object[property];
        }
    }

    return clonedObject;  // Return the cloned object
}

NOTE: It's important to be cautious when creating the cloned object from the original one.

Remember that if you use var cloned = {};, the prototypes will be different and the solution may not work perfectly because instances might not match using the instanceof operator.
If you only use
```
var cloned = Object.create(object);
```
as suggested in other answers, you'll get a cloned object with a similar prototype. However, you still need to copy the properties from the original object to the cloned one. That's why the for-loop is necessary.

If the previous approach of using Object.create doesn't work in your browser due to a legacy JavaScript engine, you can try the workaround below:

function Temporary() {};
Temporary.prototype = object.prototype;
var clonedObject = new Temporary();

I hope this information is helpful! :)

Answer 2

If you want to create a clone function, you can do so by following this example:

var makeClone = function(object) {

    // Create a new object with the same prototype as the original object
    var clonedObject = Object.create(object);      

    // Copy each property from the original object to the cloned object
    for (property in object) {      
        if (object.hasOwnProperty(property)) {
            clonedObject[property] = object[property];
        }
    }

    return clonedObject;  // Return the cloned object
}

NOTE: It's important to be cautious when creating the cloned object from the original one.

Remember that if you use var cloned = {};, the prototypes will be different and the solution may not work perfectly because instances might not match using the instanceof operator.
If you only use
```
var cloned = Object.create(object);
```
as suggested in other answers, you'll get a cloned object with a similar prototype. However, you still need to copy the properties from the original object to the cloned one. That's why the for-loop is necessary.

If the previous approach of using Object.create doesn't work in your browser due to a legacy JavaScript engine, you can try the workaround below:

function Temporary() {};
Temporary.prototype = object.prototype;
var clonedObject = new Temporary();

I hope this information is helpful! :)

Answer 3

Answer №2

To utilize the prototype method:

var newObj = Object.create(oldObj.prototype);

The Object.create function creates a fresh object with specific prototype and attributes.

It requires the prototype for the newly generated object:

Object.create(proto [, propertiesObject ])

Link to more information

Answer 4

To utilize the prototype method:

var newObj = Object.create(oldObj.prototype);

The Object.create function creates a fresh object with specific prototype and attributes.

It requires the prototype for the newly generated object:

Object.create(proto [, propertiesObject ])

Link to more information

Answer 5

Answer №3

If you're looking for an alternative method, JQuery offers a convenient solution with the Jquery.extend function. To achieve this, simply follow the syntax below:

var newObject = jQuery.extend({},originalObject);

Answer 6

If you're looking for an alternative method, JQuery offers a convenient solution with the Jquery.extend function. To achieve this, simply follow the syntax below:

var newObject = jQuery.extend({},originalObject);

Creating a clone of a JavaScript object based on an already existing JavaScript object

Answer №1

Answer №2

Answer №3

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