How do you duplicate an object in JavaScript?

To copy an object in JavaScript, you have three options:

  1. Use the spread ( ) syntax.
  2. Use the Object. assign() method.
  3. Use the JSON. stringify() and JSON. parse() methods.

Can you copy an object?

In object-oriented programming, object copying is creating a copy of an existing object, a unit of data in object-oriented programming. The resulting object is called an object copy or simply copy of the original object. Copying is basic but has subtleties and can have significant overhead.

How do you clone an object?

To clone an object, use the Object class’s clone() method. It is the quickest way to duplicate an array. The class whose object clone we wish to generate must implement the Cloneable interface. If the Cloneable interface is not implemented, the clone() function throws a CloneNotSupportedException .

Can you copy an object with object assign?

Using Object. The Object. assign() method is used to copy the values of all enumerable own properties from one or more source objects to a target object.

How many ways can you clone an object in JavaScript?

JavaScript provides 3 good ways to clone objects: using spread operator, rest operator and Object. assign() function. Aside from just cloning objects, using object spread and Object. assign() lets you add or updated properties when creating the clone.

How do you make a copy of an object in TypeScript?

Use the Object. assign() Method to Clone an Object in TypeScript. The Object. assign() works similarly as in the case of the spread operator and can be used to clone simple objects, but it fails in the case of nested objects.

Is JavaScript object assignment copy or reference?

Objects are assigned and copied by reference. In other words, a variable stores not the “object value”, but a “reference” (address in memory) for the value.

What is deep clone in JavaScript?

A deep copy is a copy of all elements of the original object. Changes made to the original object will not be reflected in the copy. In this article, you will create deep copies of objects using the Lodash library.

Is object assign deep copy?

Copy an Object With Object. assign() was the most popular way to deep copy an object. Object. assign() will copy everything into the new object, including any functions. Mutating the copied object also doesn’t affect the original object.

What is a shallow copy JavaScript?

Shallow copy is a bit-wise copy of an object. A new object is created that has an exact copy of the values in the original object. If any of the fields of the object are references to other objects, just the reference addresses are copied i.e., only the memory address is copied.