long object in javascript create code example

Example 1: create nodejs new object

let Person = function (firstName, lastName, email) {

    this.firstName = firstName;
    this.lastName = lastName;
    this.email = email;
}

let PersonBuilder = function () {

    let firstName;
    let lastName;
    let email;

    return {
        setFirstName: function (firstName) {
            this.firstName = firstName;
            return this;
        },
        setLastName: function (lastName) {
            this.lastName = lastName;
            return this;
        },
        setEmail: function (email) {
            this.email = email;
            return this;
        },
        info: function () {
            return `${this.firstName} ${this.lastName}, ${this.email}`;
        },
        build: function () {
            return new Person(firstName, lastName, email);
        }
    };
};

var person = new PersonBuilder().setFirstName('John').setLastName('Doe')
    .setEmail('[email protected]');
console.log(person.info());

Example 2: data types in javascript

1, 1.0 // Number
'String', "String"
true, false // Boolean
{id: 1;} // Object
[1, 2, 3] // Array