Typescript interface array

Question

I am trying to declare and interface. Basically a user has a collection of roles. I am not able to understand what the right syntax in Typescript for this operation.

export interface User {
    firstName: string;
    lastName: string;
    roles: [Role]
}

export interface Role {
    accountId: string;
    roleId: string;
}

`roles: Role[]` Have you tried, reading the docs on [Arrays](https://www.typescriptlang.org/docs/handbook/basic-types.html#array) ? — derpirscher, Feb 12 '21 at 10:39

score 0 · Answer 1 · answered Feb 12 '21 at 10:39

0

It is:

export interface User {
    firstName: string;
    lastName: string;
    roles: Role[];
}

answered Feb 12 '21 at 10:39

Rob Bailey

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score 0 · Accepted Answer · answered Feb 12 '21 at 10:41

According to the TypeScript Handbook, you can make a collection of something like so:

export interface Role {
    accountId: string;
    roleId: string;
}

export interface User {
    firstName: string;
    lastName: string;
    roles: Array<Role> // Can also be written as Role[]
}

(Additionally, I think roles and accountId should be kept separate.)

Typescript interface array

2 Answers2