README

Type Annotations With Objects

Type annotations with objects in TypeScript allow you to specify the types of properties that an object should have.

let personExOne: {
  name: string;
  age: number;
  jobTitle?: string;
  address: {
    street: string;
    city: string;
  };
};
 
personExOne = {
  name: "Alice",
  age: 30,
  jobTitle: "Engineer",
  address: {
    street: "123 Main St",
    city: "Wonderland",
  },
};

And there is yet another method

// Define an object type with type annotations
let personExTwo: {
  name: string;
  age: number;
  jobTitle?: string;
  address: {
    street: string;
    city: string;
  };
} = {
  name: "Alice",
  age: 30,
  jobTitle: "Engineer",
  address: {
    street: "123 Main St",
    city: "Wonderland",
  },
};

we’re defining an object named personExTwo with specific type annotations for its properties:

• name is a required string property for the person’s name.
• age is a required number property for the person’s age.
• jobTitle is an optional string property for the person’s job title, indicated by jobTitle?: string.
• address is an object with two required properties: street (string) and city (string).

We initialize personExTwo with specific values for each property. Later in the code, we modify some properties. Finally, we use console.log to display the property values of personExTwo.