Estoy aprendiendo JavaScript y tengo este problema en el que tengo que convertir una matriz de números [6, 5, 0, 8, 3, 5, 9, 1, 7, 2] y
devolver como una cadena en este formato: (650) 835-9172. usando todas las funciones en esta estructura
function PhoneNumberFormatter(numbers) { this.numbers = numbers; } PhoneNumberFormatter.prototype.render = function() { var string = ''; string = getAreaCode()+getExchangeCode()+"-"+getLineNumber() //I did this return string; }; PhoneNumberFormatter.prototype.getAreaCode = function() { let areaCode = this.numbers.slice(0,3); //I did this return parenthesize(areaCode) //I did this }; PhoneNumberFormatter.prototype.getExchangeCode = function() { return this.numbers.slice(3,6); //I did this }; PhoneNumberFormatter.prototype.getLineNumber = function() { return this.numbers.slice(6,10); //I did this }; PhoneNumberFormatter.prototype.parenthesize = function(string) { return '(' + string + ')'; }; PhoneNumberFormatter.prototype.slice = function(start, end) { return this.numbers.slice(start, end).join(''); };¿Alguna ayuda por favor?
Aquí hay una forma alternativa de usar los literales de plantilla de Javascript
Además, a algunas de sus llamadas a métodos les faltaba this palabra clave, pero otras ya lo han señalado.
function PhoneNumberFormatter(numbers) { this.numbers = numbers; } PhoneNumberFormatter.prototype.render = function() { return `${this.getAreaCode()} ${this.getExchangeCode()}-${this.getLineNumber()}`; }; PhoneNumberFormatter.prototype.getAreaCode = function() { return `(${this.numbers[0]}${this.numbers[1]}${this.numbers[2]})`; }; PhoneNumberFormatter.prototype.getExchangeCode = function() { return `${this.numbers[3]}${this.numbers[4]}${this.numbers[5]}`; }; PhoneNumberFormatter.prototype.getLineNumber = function() { return `${this.numbers[6]}${this.numbers[7]}${this.numbers[8]}${this.numbers[9]}`; }; var pnf = new PhoneNumberFormatter([6, 5, 0, 8, 3, 5, 9, 1, 7, 2]); console.log(pnf.render());Bien, he editado tu fragmento aquí. Le dejo a usted que descubra cómo usar join correctamente para sus requisitos de formato, además de cómo agregar el espacio después del código de área.
function PhoneNumberFormatter(numbers) { this.numbers = numbers; } PhoneNumberFormatter.prototype.render = function() { var string = ''; string = this.getAreaCode()+this.getExchangeCode()+"-"+this.getLineNumber() //I did this return string; }; PhoneNumberFormatter.prototype.getAreaCode = function() { let areaCode = this.numbers.slice(0,3); //I did this return this.parenthesize(areaCode) //I did this }; PhoneNumberFormatter.prototype.getExchangeCode = function() { return this.numbers.slice(3,6); //I did this }; PhoneNumberFormatter.prototype.getLineNumber = function() { return this.numbers.slice(6,10); //I did this }; PhoneNumberFormatter.prototype.parenthesize = function(string) { return '(' + string + ')'; }; PhoneNumberFormatter.prototype.slice = function(start, end) { return this.numbers.slice(start, end).join(''); }; var pnf = new PhoneNumberFormatter([6, 5, 0, 8, 3, 5, 9, 1, 7, 2]); console.log(pnf.render());se olvidó de usar esta palabra clave para los métodos prototipo de funciones. En cada método de prototipo, ha tomado los elementos cortados como cadenas sin unir los elementos.
Aquí está tu código:-
function PhoneNumberFormatter(numbers) { this.numbers = numbers; } PhoneNumberFormatter.prototype.render = function() { var string = ''; string = this.getAreaCode()+this.getExchangeCode()+"-"+this.getLineNumber() //I did this return string; }; PhoneNumberFormatter.prototype.getAreaCode = function() { let areaCode = this.slice(0,3);//I did this return this.parenthesize(areaCode) //I did this }; PhoneNumberFormatter.prototype.getExchangeCode = function() { return this.slice(3,6); //I did this }; PhoneNumberFormatter.prototype.getLineNumber = function() { return this.slice(6,10); //I did this }; PhoneNumberFormatter.prototype.parenthesize = function(string) { return '(' + string + ')'; }; PhoneNumberFormatter.prototype.slice = function(start, end) { return this.numbers.slice(start, end).join(''); }; console.log(new PhoneNumberFormatter([6, 5, 0, 8, 3, 5, 9, 1, 7, 2]).render())