"Utilizing TypeScript to assign specific types to recognized keys while also accommodating for undefined

Is there a way to declare an object in such a manner that it requires certain keys, while also allowing for the inclusion of any other keys?

Let's say we have an object called student which must always include the keys name and gender, but can also have additional keys. How can this type be declared?


        let student: { name: string, gender: string, ... };

        //examples of valid assignments
        student = {
            name: 'Goku',
            gender: 'male',
            power: 'Super Saiyan'
        }

        student = {
            name: 'Pikachu',
            gender: 'unknown',
            body: 'yellow',
            shoeSize: 20
        }
    

I've had trouble finding resources or tutorials on this specific topic. Is this considered bad practice, and if so, why?

Answer №1

const person: {
  name:string;
  age:number;
  [key: string]: any;
};

// these are accurate
person = {
  name: 'Alice',
  age: 25,
  hobby: 'painting'
};

person = {
  name: 'Bob',
  age: 30,
  occupation: 'engineer',
  salary: 70000
};

// this is inaccurate
person = {
  occupation: 'doctor',
  salary: 90000
};

Answer №2

One possible solution is to create an interface that includes properties for name and gender, then have your class inherit from the 'Any' superclass while also implementing the interface.

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