Métodos

Clase 3 de 25 • Curso de TypeScript: Programación Orientada a Objetos y Asincronismo

William Cortes

student•

Entendí que: métodos => Funciones dentro de una clase. propiedades ó atributos => Variables (ó constantes) dentro de una clase.

Luis Ariza

student•

¡¡Entendiste bien!! 👍

Josue Cerron Tuesta

student•

Así es bro!

Axel Enrique Galeed Gutierrez

student•

Les comparto mis apuntes. :D

¿Qué hacen los métodos?

Describen el comportamiento de los objetos.

Sintaxis

class nameClass {
		constructor (parameters) { statements }

		methodName (parameters: dataTypes): dataType { statements }
}

Eduardo Esteban Álvarez Castañeda

student•

Ojo que una buena práctica, es crear los nombres de las clases en formato PascalCase

Axel Enrique Galeed Gutierrez

student•

Hola, @Proskynete, tenés toda la razón, se me escapó ese typo.

Jordy Mairena Montoya

student•

Mi solucion

export type formatDate = 'days' | 'months' | 'years';

class MyDate {
    year: number;
    month: number;
    day: number;
    leapYear: boolean = false; // by deafault the year is not leap year

    private _months: { [key: number]: string; } = {
        1: 'January',
        2: 'February',
        3: 'March',
        4: 'April',
        5: 'May',
        6: 'June',
        7: 'July',
        8: 'August',
        9: 'September',
        10: 'October',
        11: 'November',
        12: 'December'
    };

    private _month31: number[] = [1, 3, 5, 7, 8, 10, 12]; // list of months that have 31 days

    constructor(year: number, month: number, day: number) {
        this.year = this._validYear(year);
        this._leapYear()
        this.month = this._validMonth(month);
        this.day = this._validDay(day);
    }

    printFormat(format: string = 'dd / mm / yy'): string {
        if (this._validError() == null) { // if validError returns null then there are no errors
            format = format.replace('yy', this.year.toString());
            format = format.replace('dd', this.day.toString());
            format = format.replace('mm', this.month.toString());
            format = format.replace('mn', this._months[this.month]);
            return format;
        } else {
            return this._validError()!; // notation ! tells typescript that the programmer is in control
        }
    }

    private _validError(): string | null {
        // if any attribute has the value of zero then it is out of range and there is an error
        let error: string = '#outRange!'; // out of tange error indicator
        if (this.year == 0) {
            return `${error} year`; // error message
        }
        if (this.month == 0) {
            return `${error} month`; // error message
        }
        if (this.day == 0) {
            return `${error} day`; // error message
        }
        return null; // whithout errors
    }

    private _validYear(year: number) {
        // if the year is greater than zero it is valid
        if(year > 0) {
            return year;
        } else {
            return 0;
        }
    }

    private _validDay(day: number) {
        // validate the day
        if (day > 0) {
            if (this.month === 2) { // if the month is february
                let evaluateDay: number = 28;
                if (this.leapYear) { // if leap year
                    evaluateDay++;
                }
                if (day <= evaluateDay) {
                    return day;
                } else {
                    return 0;
                }
            } else { // if it is any month except february
                let evaluateDay: number = 30;
                if (this._month31.includes(this.month)) { // if the month has 31 days
                    evaluateDay++;
                }
                if (day <= evaluateDay) {
                    return day;
                } else {
                    return 0;
                }
            }
        } else {
            return 0
        }
    }

    private _validMonth(month: number) {
        // Validated that the month is between 1 and 12
        if (month > 0 && month < 13) {
            return month;
        } else {
            return 0;
        }
    }

    private _leapYear() {
        /**
         * @ Check if the year is a leap year
         */
        let result: number;
        result = (this.year / 4) % 2; // formula if ((n/4) % 2 == 0)

        if(result == 0) {
            this.leapYear = true;
        }
    }

    add(amount: number, format: formatDate) {
        if (this._validError() == null) {
            if (format == 'days') {
                for (let i = 0; i < amount; i++) {
                    this.day += 1;
                    if (this._validDay(this.day) == 0) { // Validated the day based on the month and year
                        /* if _validDay returns 0 the valid days for the current month
                        were exceeded then the month is increased and day is restarted */
                        this.month++;
                        if (this.month == 13) {
                            this.year++;
                            this.month = 1;
                        }
                        this.day = 1;
                    }
                }
            } else if (format == 'months') {
                for (let i = 0; i < amount; i++) {
                    this.month++;
                    if (this.month > 12) {
                        this.year++;
                        this.month = 1;
                    }
                }
            } else if (format == 'years') {
                if (amount > 0) {
                    this.year += amount;
                }
            }
        }
    }
}

const myDate = new MyDate(2000, 2, 29);
console.log(myDate.printFormat('dd of mn of yy'));
myDate.add(36, 'days');
console.log(myDate.printFormat());
myDate.add(40, 'months');
console.log(myDate.printFormat('mm - dd - yy'));

Ronaldo Delgado

student•

Genial!

CHRISTIAN OLIVER SOLANO NUÑEZ

student•

mi solución para sumar fechas considerando años bisiestos :

add(amount:number, type: 'days' | 'months' | 'years') {
    if(type === 'days') {
      if(this.month === 4 || this.day  === 6 || this.day === 9 || this.day === 11) {
        this.sumByDays(amount, 30);
      }else if(this.month === 2){
        if(this.isLeapYear(this.year)){
          this.sumByDays(amount, 29);
        } else {
          this.sumByDays(amount, 28);
        }
      }else {
        for(let x = 1; x <= amount; x++){
          if(this.day < 31){
            this.day++;
          }else {
            this.day = 0;
            this.day++;
            if(this.month === 12){
              this.month = 1;
              this.year += 1;
            }else {
              this.month += 1;
            }
          }
      }

    }
  }
    if(type === 'months') {

      for(let x = 1; x <= amount; x++){
        if(this.month < 12){
          this.month++;
        }else {
          this.month = 0;
          this.month++;
          this.year += 1;
        }
      }
    }
    if(type === 'years') {
      this.year += amount;
    }
  };

  sumByDays(sum: number, days: number){
    for(let x = 1; x <= sum; x++){
      if(this.day < days){
        this.day++;
      }else {
        this.day = 0;
        this.day++;
        this.month += 1;
      }
    }
  };

  isLeapYear(year: number){ //calculo año bisisesto
    return ((year % 4) === 0 && (year % 100) != 0 || ((year % 400) === 0));
  };

Kevin Daniel Guzman Delgadillo

student•

¿Y si añado por ejemplo 100 días o 24 meses? ... si se lo preguntaron aquí está el código:

export class MyDate {
  year: number;
  month: number;
  day: number;

  constructor(year: number, month: number, day: number) {
    this.year = year;
    this.month = month;
    this.day = day;
  }

  printFormattedDate(): string {
    return `${this.year}/${this.month}/${this.day}`;
  }

  add(amount: number, type: 'd' | 'm' | 'y') {
    const funcOperators = {
      d: (amount: number) => {
        this.day += amount;
        if (this.day > 30) this.day = this.day % 365 % 30;

        return Math.floor(amount / 30);
      },
      m: (amount: number) => {
        this.month += amount;
        if (this.month > 12) this.month = this.month % 12;

        return Math.floor(amount / 12);
      },
      y: (amount: number) => {
        this.year += amount;
        return 0;
      },
    };

    let found = false;
    Object.keys(funcOperators).forEach((key) => {
      if (key === type) found = true;
      if (found) amount = funcOperators[key as 'd' | 'm' | 'y'](amount);
    });
  }
}

const date = new MyDate(2021, 1, 1);
console.log(date.printFormattedDate());
date.add(365, 'd');
date.add(12, 'm');
date.add(1, 'y');
console.log(date.printFormattedDate());

```export class MyDate {  year: number;  month: number;  day: number;
&#x20; constructor(year: number, month: number, day: number) {    this.year = year;    this.month = month;    this.day = day;  }
&#x20; printFormattedDate(): string {    return `${this.year}/${this.month}/${this.day}`;  }
&#x20; add(amount: number, type: 'd' | 'm' | 'y') {    const funcOperators = {      d: (amount: number) => {        this.day += amount;        if (this.day > 30) this.day = this.day % 365 % 30;
&#x20;       return Math.floor(amount / 30);      },      m: (amount: number) => {        this.month += amount;        if (this.month > 12) this.month = this.month % 12;
&#x20;       return Math.floor(amount / 12);      },      y: (amount: number) => {        this.year += amount;        return 0;      },    };
&#x20;   let found = false;    Object.keys(funcOperators).forEach((key) => {      if (key === type) found = true;      if (found) amount = funcOperators\[key as 'd' | 'm' | 'y']\(amount);    });  }}
const date = new MyDate(2021, 1, 1);console.log(date.printFormattedDate());date.add(365, 'd');date.add(12, 'm');date.add(1, 'y');console.log(date.printFormattedDate());

Jesus Abel Jimenez Bracho

student•

" Los metodos definen el comportamiento de los objetos."

Javier Alejandro Albornoz Pérez

student•

Solución tomando en cuenta los meses de 30 días:

addDate(amount: number, type: 'YY' | 'DD' | 'MM') {
    if (type === 'DD') {
      this.day += amount;
      if (this.day > 30) {
        this.day -= 30;
        this.month += 1;
      }
    }
    if (type === 'MM') {
      this.month += amount;
      if (this.month > 12) {
        this.month -= 11;
        this.year += 1;
      }
    }
    if (type === 'YY') {
      this.year += amount;
    }
    return `${this.year}/${this.month}/${this.day}`;
  }
}

Kellbis Salazar

student•

Este fue lo que me puse a implementar, hice una validacion para que al momento de crear una fecha el mes no sea mayor a 12 y dia no sea mayor a 31 solo para implementar algo de innovacion al codigo.

Tambien aproveche de usar el inusable switch y agregar logica de suma de dias, meses y years:

Victor Perozo

student•

class Dte { year: number; month: number; day: number; constructor(year: number, month: number, day: number) { this.year = year; this.month = month; this.day = day; } toString(): string { return ${this.day}-${this.month}-${this.year}; } add(amount: number, type: 'days' | 'months' | 'years') { if(type === 'days') { this.day += amount; } if(type === 'months') { this.month += amount; } if(type === 'years') { this.year += amount; } const newyear = () => { if(this.month === 13) { this.month = 1; this.year += 1; } return this; } if(this.day === 32) { this.day = 1; this.month += 1; newyear(); } }; } const dte = new Dte(2022, 12, 31);dte.add(1, 'days');console.log(dte.toString());

Andrés Corral

student•

Para hacer el add mas eficiente y escalable

add(amount: number, type: 'day' | 'month' | 'year'){

if (['day', 'month', 'year'].includes(type)) { this[type] += amount; } else {

throw new Error('Invalid type provided'); } }

Paula Catalina Delgado Almendrales

student•

Mi solución:

export class MyDate{ year: number; month: number; day: number;

constructor(year: number,month: number,day: number){ this.year= year; this.month =month; this.day = day; }

printFormat(): string{ return ${this.day}/${this.month}/${this.year}; } add(amount: number, type: 'days'|'months'|'years'){ if(type==='days'){ if (this.month == 12) { let diaMayor = 31; let diasRestantes = diaMayor - this.day; let diferencia = amount - diasRestantes if(diferencia != 0 ){ this.day -= this.day; this.day += diferencia; this.month=0 this.month+=1; this.year+=1; } if(diferencia==0){ this.day += amount ; } if(diferencia >=32){ this.day = diferencia - diaMayor; this.day =this.day + 1; // this.month=0 this.month+=1; return this.day ; } return this.day; return this.month; return this.year

   }
  if (this.month == 2) {
   let diaMayor = 28;
   let diasRestantes = diaMayor - this.day;
   let diferencia = amount - diasRestantes
  if(diferencia != 0 ){
   this.day -= this.day;
  this.day += diferencia;
   this.month+=1;
 }
 if(diferencia==0){
   this.day += amount ;
  }
  if(diferencia >=29){
   this.day = diferencia - diaMayor;
   this.day =this.day + 1;
     this.month+=2;
     return this.day ;
  }
 return this.day;
 return this.month;
 return this.year

  }
  if(this.month==12 && this.day<31){
    let diaMayor=31;
    let diasRestantes = diaMayor - this.day;
    let diferencia = amount - diasRestantes
   if(diferencia != 0 ){
    this.day -= this.day;
   this.day += diferencia;
    this.month=0;
    this.month+=1;
    this.year +=1;
  }
  if(diferencia==0){
    this.day += amount ;
   }
   if(diferencia >=32){
    this.day = diferencia - diaMayor;
    this.day =this.day + 1;
      this.month+=2;
      return this.day ;
   }
  return this.day;
  return this.month;
  return this.year

  }
    let diaMayor=31;
    let diasRestantes = diaMayor - this.day;
    let diferencia = amount - diasRestantes
    console.log(diaMayor,diasRestantes,diferencia,this.day);
    if(diferencia > 0){
      if(diferencia >=32){
        this.day = diferencia - diaMayor;
        this.day =this.day + 1;
          this.month+=2;
          return this.day ;
       }
        if(diferencia != 0 ){
         this.day -= this.day;
        this.day += diferencia;
         this.month+=1;
       }
       if(diasRestantes == 0){
         this.day =0;
         this.day + amount;
       this.month +=0
       }
       if (this.month==12 && this.day>=31) {
         this.day = 0
         this.month = 0;
         this.month +=1
         this.year += 1
         this.day += amount;
       }
    }else if(diferencia < 0){
      this.day += amount;
    }

  }

if(type==='months'){
  if(this.month>=12){
      this.year += 1;
      for (let index = 0; this.month>=12; index++) {
        this.month = 0;
      this.month+=1;
      }
      return this.month;
  }
  this.month+=amount;
}
if(type==='years'){
  this.year+=amount;
}

} } const myDate = new MyDate(2020,2,25);

console.log('Mi fecha de nacimiento es: ' ,myDate.printFormat());

myDate.add(10,'days');

console.log('Mi fecha final1 es: ', myDate.printFormat()); const myDate2 = new MyDate(2020,2,25); myDate2.add(10,'months');

console.log('Mi fecha final2 es: ', myDate2.printFormat()); const myDate3 = new MyDate(2020,2,25); myDate3.add(10,'years');

console.log('Mi fecha final3 es: ', myDate3.printFormat());

Jose Gregorio Sarabia Lugo

student•

export class MyDate {
    year : number;
    month: number;
    day: number;

    constructor(year: number, month: number, day: number) {
        this.year = year;
        this.month = month;
        this.day = day;
    }

    monthArray = [        
    'January',
    'February',
    'March',
    'April',
    'May',
    'June',
    'July',
    'August',
    'September',
    'October',
    'November',
    'December']
    
    printFormat(): string {
        return `${this.day}-${this.monthArray[this.month]}-${this.year}`;
    }

    add(amount: number, type: 'day' | 'month' | 'year') {
            this[type]+= amount;

            return this.printFormat();
    }
    
}

const date = new MyDate(2013,11, 6);

console.log(date.printFormat()); // 6-December-2013

console.log(date.add(-4, 'month')); // 6-August-2013

Johan Sebastian

student•

class MyDate {
  year: number;
  month: number;
  day: number;

  constructor(year: number, month: number, day: number) {
    this.year = year;
    this.month = month;
    this.day = day;
  }

  printFormat(): string {
    return `${this.day}/${this.month}/${this.year}`;
  }

  add(amount: number, type: 'days' | 'months' | 'years') {
    if (type === 'days') {
      if (amount < 31) {
        this.day += amount;
      } else if (amount >= 31) {
        amount = 1;
        this.day = amount;
        this.month += amount;
      }
    } else if (type === 'months') {
      if (amount < 12) {
        this.month += amount;
      } else if (amount >= 12) {
        amount = 1;
        this.year += amount;
        this.day = amount;
        this.month = amount;
      }
    } else if (type === 'years') {
      this.year += amount;
    }
  }
}

const myDate = new MyDate(2002, 4, 10);
console.log('Date =>', myDate.printFormat());
myDate.add(2, 'days');
console.log('Date =>', myDate.printFormat());
myDate.add(31, 'days');
console.log('Date =>', myDate.printFormat());
myDate.add(11, 'months');
console.log('Date =>', myDate.printFormat());
myDate.add(12, 'months');
console.log('Date =>', myDate.printFormat());

Pedro Carreño

student•

Cuando resulta mas conveniente usar clases sobre usar funciones?

Jose Ever Muñoz Muñoz

student•

Las clases son para usarse como moldes cuando necesites crear muchas veces una programación o una programación muy similar vas a poder reutilizar las clases, las funciones se usan para cosas más específicas como convertir un string a entero o sumar dos números, cosas menos complejas

Valentina Hernández

student•

¿Qué es un método?

Un método es como una acción que puede hacer un objeto. Es una función que vive dentro de una clase y le dice al objeto qué hacer.

Juan David Marin Rodriguez

student•

De esta manera se puede validar si llegamos a un mes máximo se suma el año y un día máximo se suma mes.

Diego Raciel Ortega Hernandez

student•

Los constructores son los que definen los parámetros de la clase. Es decir, cuando creamos una instancia los argumentos que le pasamos van dirigidos al constructor y luego esos parámetros guardados en los atributos se utilizan en los métodos de la clase.

Corriganme si estoy mal o entendí mal.

oscar.rusinque

student•

Según lo que que entiendo, el constructor es un método especial donde se inicializan los parármetros de de la clase , cuando se irealiza una nueva instancia se llama automaticamente el constructor para inicializar dichos parametros de la clase con los valores proporcionados por la nueva instancia y así ya se puede usar en los demás métodos de la clase. En el constructor no necesariamente se tienen que inicializar los parámetros, se pueden inicializar al declararlos o en otros métodos tmbien los constructores como un método tiene su visibilidad

Winslow Taylor Geldres Oliveros

student•

Ronaldo Delgado

student•

excelente video

Michael Martinez

company_admin•

Esta libreria es muy util para fechas y monedas.. 100% recomendada. https://www.npmjs.com/package/moment