How to merge the two objects in TypeScript

In this tutorial, we are going to learn about how to merge the two objects in TypeScript with the help of examples.

Consider, we have the following two objects in our code:

const user = {id:1, name:"gowtham"}
const posts = { title:"my post", body:"demo"}

Now, we need to combine the above two object into a single object.

Using Spread operator

To merge the two objects into a single object, we can use the es6 spread(…) operator in TypeScript.

Here is an example:

const user = {id:1, name:"gowtham"};
const posts = { title:"my post", body:"demo"};

const result = {...user, ...posts};
console.log(result);

Output:

{id:1, name:"gowtham", title:"my post", body:"demo"}

Note: The spread(…) operator unpacks the iterables (such as sets, objects, objects, etc) into a individual elements.

Using Object.assign( ) method

Alternatively, we can use the built-in Object.assign() method to merge the objects in TypeScript.

The Object.assign() method takes the two arguments, first one is the target object where source objects needs to be added.

The second argument is the one or more source objects.

Here is an example:

const user = {id:1, name:"gowtham"};
const posts = { title:"my post", body:"demo"};

const result = Object.assign({}, user, posts);
console.log(result);

Merging three objects

const user = {id:1, name:"gowtham"};
const posts = { title:"my post", body:"demo"};
const comments = {comment: "super good"};


const result = Object.assign({}, user, posts, comments);

Output:

{
 id:1, name:"gowtham",
 title:"my post",
 body:"demo",
 comment: "super good"
}