CODEWITHSUNDEEP
typescript
Serj Sagan
Serj Sagan

Reputation: 30208

Using automatically created properties in the class

I am just learning TypeScript so this is a newb question, but Google and even SO failed to help.

Given this code:

class Student implements IPerson {
    public fullname: string = firstname + " " + middleinitial + " " + lastname;

    constructor(public firstname, public middleinitial, public lastname) {
        // this.fullname = firstname + " " + middleinitial + " " + lastname;
    }
}

function greeter(person: IPerson) {
    return "Hello, " + person.fullname;
}

when I try to assign to fullname in the initial declaration:

public fullname: string = firstname + " " + middleinitial + " " + lastname;

TypeScript is saying that firstname, middleinitial and lastname don't exist, yet somehow, the compiled code works as expected. What am I doing wrong here? I understand I can assign the auto gen props in the constructor (as is shown in the comment) but that is not always what I need...

Upvotes: 0

Views: 44

Answers (1)

NYCdotNet
NYCdotNet

Reputation: 4647

To access a property in the current class, you have to prefix it with this.

public fullname: string = this.firstname + " " + this.middleinitial + " " + this.lastname;

It works without using this inside the constructor because the parameters have those names.

Upvotes: 3

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