TypeScript - Issue with Get property in object initializer

Question

I am using TypeScript with Angular2, following is my class declaration -

export /**
 * Stress
 */
class Student {
    FirstName: string;
    LastName: string;

    constructor() {
    }

    get FullName() : string {
        return this.FirstName + this.LastName;
    }
}

When I try to initialize the above class using following code -

var stud1: Student = { FirstName:"John", LastName:"Troy" }

I am getting the following error -

Type '{ FirstName: string; LastName: string; }' is not assignable to type 'Student'.
Property 'FullName' is missing in type '{ FirstName: string; LastName: string; }'.

Any help please what I am doing wrong here, or it is not supported yet by TypeScript?

When I try to initialize the above class I guess you mean "instantiate". — user663031
– user663031, Commented Aug 20, 2016 at 15:38

Granga · Accepted Answer · 2016-08-20 14:50:46Z

2

To construct an object from your Student class you need to use the class' constructor.

var stud1 = new Student();
stud1.FirstName = "John";
stud1.LastName = "Troy";

console.log(stud1.FullName);

Or even better, let the constructor initialize object's fields:

class Student {
    FirstName: string; //this is public, unless you specify private
    LastName: string;

    constructor(firstName: string, lastName: string){
        this.FirstName = firstName;
        this.LastName = lastName;
    }

    //your FullName getter comes here
}

var stud1 = new Student("John", "Troy");
console.log(stud1.FullName);

answered Aug 20, 2016 at 14:50

Granga

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3 Comments

Raj Over a year ago

I could have done that just that I find object initializers more handy. More so when I don't want to put every "set" property in constructor, which in this case I have to. Thanks for the response.

Granga Over a year ago

To work with object initializer, Student will need to be Interface, but then Student will not be able to contain methods including getters. They've discussed some options here.

Raj Over a year ago

Thanks Granga, that helps.

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