typescript - getting error trying to implement an interface inside a class

Question

Can anybody tell me what i'm doing wrong... i'm trying to use an interface inside a class an initialize it, but i'm getting this error :

Uncaught TypeError: Cannot set property 'name' of undefined
at new User (eval at setTimeout (main.js:493), <anonymous>:4:24)
at eval (eval at setTimeout (main.js:493), <anonymous>:9:14)
at setTimeout (main.js:493)

here is what i'm trying to do:

interface UserInterface {
    name: string
    email: string
}

class User {
    id: string
    data: UserInterface

    constructor(){
        this.data.name = ''
        this.data.name = ''
        this.id = ''
    }
}

const user = new User()

console.log(user.data)

tks people!

Ian MacDonald · Accepted Answer · 2019-01-30 21:18:42Z

2

You haven't assigned a value to this.data yet, so it is undefined.

Instead, assign it like so:

this.data = {
  name: '',
  email: '',
};

answered Jan 30, 2019 at 21:18

Ian MacDonald

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