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| 1 | +/* |
| 2 | + * EJERCICIO: |
| 3 | + * Explora el "Principio SOLID de Sustitución de Liskov (Liskov Substitution Principle, LSP)" |
| 4 | + * y crea un ejemplo simple donde se muestre su funcionamiento |
| 5 | + * de forma correcta e incorrecta. |
| 6 | + * |
| 7 | + * DIFICULTAD EXTRA (opcional): |
| 8 | + * Crea una jerarquía de vehículos. Todos ellos deben poder acelerar y frenar, así como |
| 9 | + * cumplir el LSP. |
| 10 | + * Instrucciones: |
| 11 | + * 1. Crea la clase Vehículo. |
| 12 | + * 2. Añade tres subclases de Vehículo. |
| 13 | + * 3. Implementa las operaciones "acelerar" y "frenar" como corresponda. |
| 14 | + * 4. Desarrolla un código que compruebe que se cumple el LSP. |
| 15 | + */ |
| 16 | +//EJERCICIO |
| 17 | + |
| 18 | +/* |
| 19 | +
|
| 20 | +"Si S es un subtipo de T, entonces los objetos de tipo T en un programa de computadora pueden ser sustituidos por objetos de tipo S, sin alterar ninguna de las propiedades deseables de ese programa." |
| 21 | +
|
| 22 | +*/ |
| 23 | +class GeometricShape { |
| 24 | + constructor() { |
| 25 | + this.area = this.getArea(); |
| 26 | + } |
| 27 | + |
| 28 | + getArea() { |
| 29 | + return 1; |
| 30 | + } |
| 31 | +} |
| 32 | + |
| 33 | +class Rectangle extends GeometricShape { |
| 34 | + constructor(height, width) { |
| 35 | + super(); |
| 36 | + this.height = height; |
| 37 | + this.width = width; |
| 38 | + this.area = this.getArea(); |
| 39 | + } |
| 40 | + |
| 41 | + getArea() { |
| 42 | + return this.height * this.width; |
| 43 | + } |
| 44 | +} |
| 45 | + |
| 46 | +class Square extends GeometricShape { |
| 47 | + constructor(height) { |
| 48 | + super(); |
| 49 | + this.height = height; |
| 50 | + this.area = this.getArea(); |
| 51 | + } |
| 52 | + |
| 53 | + getArea() { |
| 54 | + return this.height ** 2; |
| 55 | + } |
| 56 | +} |
| 57 | + |
| 58 | +class Circle extends GeometricShape { |
| 59 | + constructor(radius) { |
| 60 | + super(); |
| 61 | + this.radius = radius; |
| 62 | + this.area = this.getArea(); |
| 63 | + } |
| 64 | + |
| 65 | + getArea() { |
| 66 | + return this.radius * 2 * Math.PI; |
| 67 | + } |
| 68 | +} |
| 69 | + |
| 70 | +function displayArea(shape) { |
| 71 | + console.log(shape.area); |
| 72 | +} |
| 73 | + |
| 74 | +let square = new Square(12); |
| 75 | + |
| 76 | +displayArea(square); |
| 77 | + |
| 78 | +//EXTRA |
| 79 | +class Vehicle { |
| 80 | + constructor() { |
| 81 | + this.speed = 0; |
| 82 | + } |
| 83 | + |
| 84 | + accelerate(amount) { |
| 85 | + this.speed += amount * 1.2; |
| 86 | + } |
| 87 | + |
| 88 | + brake(amount) { |
| 89 | + this.speed -= amount * 0.8; |
| 90 | + |
| 91 | + if (this.speed < 0) { |
| 92 | + this.speed = 0; |
| 93 | + } |
| 94 | + } |
| 95 | +} |
| 96 | + |
| 97 | +class Motorcycle extends Vehicle { |
| 98 | + constructor() { |
| 99 | + super(); |
| 100 | + } |
| 101 | + |
| 102 | + accelerate(amount) { |
| 103 | + this.speed += amount * 1.5; |
| 104 | + } |
| 105 | + |
| 106 | + brake(amount) { |
| 107 | + this.speed -= amount * 1.2; |
| 108 | + |
| 109 | + if (this.speed < 0) { |
| 110 | + this.speed = 0; |
| 111 | + } |
| 112 | + } |
| 113 | +} |
| 114 | + |
| 115 | +class Car extends Vehicle { |
| 116 | + constructor() { |
| 117 | + super(); |
| 118 | + } |
| 119 | + |
| 120 | + accelerate(amount) { |
| 121 | + this.speed += amount * 1.6; |
| 122 | + } |
| 123 | + |
| 124 | + brake(amount) { |
| 125 | + this.speed -= amount * 1.3; |
| 126 | + |
| 127 | + if (this.speed < 0) { |
| 128 | + this.speed = 0; |
| 129 | + } |
| 130 | + } |
| 131 | +} |
| 132 | + |
| 133 | +class SciFiTurboCar extends Vehicle { |
| 134 | + constructor() { |
| 135 | + super(); |
| 136 | + } |
| 137 | + |
| 138 | + accelerate(amount) { |
| 139 | + this.speed += amount * 3; |
| 140 | + } |
| 141 | + |
| 142 | + brake(amount) { |
| 143 | + this.speed -= amount * 2.5; |
| 144 | + |
| 145 | + if (this.speed < 0) { |
| 146 | + this.speed = 0; |
| 147 | + } |
| 148 | + } |
| 149 | +} |
| 150 | + |
| 151 | +function checkLSP(vehicle) { |
| 152 | + if (!vehicle.accelerate || !vehicle.brake) { |
| 153 | + throw new Error('El objeto no cumple con la interfaz de Vehículo'); |
| 154 | + } |
| 155 | + |
| 156 | + vehicle.accelerate(78); |
| 157 | + vehicle.brake(4); |
| 158 | + |
| 159 | + console.log(vehicle); |
| 160 | +} |
| 161 | + |
| 162 | +const vehicle = new Vehicle(); |
| 163 | +const toyota = new Car(); |
| 164 | +const jaguar = new Motorcycle(); |
| 165 | +const hypercar3000 = new SciFiTurboCar(); |
| 166 | + |
| 167 | +checkLSP(vehicle); |
| 168 | +checkLSP(toyota); |
| 169 | +checkLSP(jaguar); |
| 170 | +checkLSP(hypercar3000); |
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