Typescript: Interface with function

 Typescript: interface

interface Owner {

  name: string;

  gender: string;

}

interface Vehicle {

  name: string;

  year: Date;

  broken: boolean;

  owner: Owner;

  summary: () => string;

}

const civic: Vehicle = {

  name: "civic",

  year: new Date(),

  broken: true,

  owner: { name: "yenonn", gender: "male" },

  summary: function (): string {

    return `summary: name ${this.name} year: ${this.year} broken: ${this.broken} owned by ${this.owner.name}`;

  },

};

console.log(civic.summary());