Combine Functions Into Class.md

Combine Functions into Class

Why?

You have multiple functions that have related behavior like an object.

Benefits:

• code is more readable
• provide a reference, an object to pass to other systems.

What?

Encapsulate in a class all related functions.

How?

• Create a class
• Move all the related functions to that class
• Test

Sample

For simplicity, I commented the code that is not changed. Before

/*
class Person{
    #firstName;
    #lastName;
    #dateOfBirth;
    #address;

    #income
    #expenses

    constructor(firstName, lastName, dateOfBirth){
        this.#firstName = firstName;
        this.#lastName = lastName;
        this.#dateOfBirth = dateOfBirth;
    }

    get Address(){
        return this.#address;
    }

    get FirstName(){
        return this.#firstName;
    }

    isAdult(){
        return this.getAge() >= 18;
    }

    getAge(){
        const diffMiliseconds = Date.now() - Date.parse(this.#dateOfBirth);
        return new Date(diffMiliseconds).getFullYear() - 1970;
    }

    get FirstName(){
        return this.#firstName;
    }

    getFormattedAddress(){
        return this.#address.getFormattedAddress();
    }

    get LastName(){
        return this.#lastName;
    }

    get FullName(){
        return this.#firstName + ' ' + this.#lastName;
    }
*/

    get Income(){
        return this.#income;
    }

    get Expenses(expenses){
        return this.#expenses;
    }

    set Income(income){
        this.#income = income;
    }   

    set Expenses(expenses){
        this.#expenses = expenses;
    }

    getBalance(){
        return this.#income - this.#expenses;
    }
/*
    printPerson(){
        let age = this.getAge();
        this.showDetails(age);
    }

    set Address(address){
        this.#address = address;
    }

    showDetails(age){
        console.log(`name: ${this.firname}`);
        console.log(`name: ${this.lastName}`);
        console.log(`name: ${age}`);
    }
}*/

class Budget{
    #income;
    #expenses;
    
    get Income(){
        return this.#income;
    }

    get Expenses(){
        return this.#expenses;
    }

    set Income(income){
        this.#income = income;
    }   

    set Expenses(expenses){
        this.#expenses = expenses;
    }

    addExpenses(amount){
        this.#expenses += amount;
    }

    addIncome(amount){
        this.#income += amount;
    }

    getBalance(){
        return this.#income - this.#expenses;
    }
}
/*
class Person{
    #firstName;
    #lastName;
    #dateOfBirth;
    #address;
    #budget;

    constructor(firstName, lastName, dateOfBirth){
        this.#firstName = firstName;
        this.#lastName = lastName;
        this.#dateOfBirth = dateOfBirth;
    }

    get Address(){
        return this.#address;
    }
    
    set Address(address){
        this.#address = address;
    }

    get FirstName(){
        return this.#firstName;
    }

    isAdult(){
        return this.getAge() >= 18;
    }

    getAge(){
        const diffMiliseconds = Date.now() - Date.parse(this.#dateOfBirth);
        return new Date(diffMiliseconds).getFullYear() - 1970;
    }

    get FirstName(){
        return this.#firstName;
    }

    getFormattedAddress(){
        return this.#address.getFormattedAddress();
    }

    get LastName(){
        return this.#lastName;
    }

    get FullName(){
        return this.#firstName + ' ' + this.#lastName;
    }

    get Budget(){
        return this.#budget;
    }

    set Budget(budget){
        this.#budget = budget;
    }

    printPerson(){
        let age = this.getAge();
        this.showDetails(age);
    }

    showDetails(age){
        console.log(`name: ${this.firname}`);
        console.log(`name: ${this.lastName}`);
        console.log(`name: ${age}`);
    }
}*/