how to find the index of an object in an array in typescript?

Hello Friends 👋,

Welcome to Infinitbility.

Today, we are going to learn how we can get index of object based array on object property condition if condition true we should get index of match object.

TypeScript provide findIndex() method to get index of element in array, we can also use this method to find index of object in array.

findIndex() method return -1 if condition not matched.

Supppose we have array of objects like below.

Copy 
1interface User {
2  id: number;
3  name: string;
4}
5
6interface Api {
7  status: number;
8  users: Array<User>;
9}
10
11let users: Array<User> = [
12  { id: 1, name: 'infinitbility' },
13  { id: 2, name: 'notebility' },
14  { id: 3, name: 'repairbility' },
15];

Now, we are going use findIndex() method with condition to get index of object.

For find index array of objects, we should follow below syntax.

Copy 
1users.findIndex(e => e.id == 2);

In below example, i have added example of if findIndex method got true condition or false both.

Copy 
1interface User {
2  id: number;
3  name: string;
4}
5
6interface Api {
7  status: number;
8  users: Array<User>;
9}
10
11let users: Array<User> = [
12  { id: 1, name: 'infinitbility' },
13  { id: 2, name: 'notebility' },
14  { id: 3, name: 'repairbility' },
15];
16
17// found index example
18users.findIndex(e => e.id == 2);
19
20// not found index example
21users.findIndex(e => e.id == 3);

Output

Thanks for reading…