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ES6 Mixins
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// Mixins with just Object.assign | |
// (Could have used _.extend without ES6) | |
(function() { | |
"use strict"; | |
// Define 3 Mixins Related to Vehicles | |
var HasWheels = { | |
wheelCount: 4, // default to 4 wheels | |
getWheelCount: function() { | |
return this.wheelCount; | |
} | |
}; | |
var HasHorn = { | |
hornSound: 'BEEP!', // default to beep | |
getHornSound: function() { | |
return this.hornSound; | |
} | |
}; | |
var HasBasket = { | |
basketCapacity: 0.0, // default to empty | |
getBasketCapacity: function() { | |
return this.basketCapacity; | |
}, | |
addToBasket: function(item, amount) { | |
this.getItemsInBasket().push(item); | |
this.basketCapacity += amount; | |
}, | |
getItemsInBasket: function() { | |
if (!this.items) { | |
this.items = []; | |
} | |
return this.items; | |
} | |
}; | |
// Define Car and Bike Types | |
var Car = Object.assign({ | |
model: 'Ford Focus', // default to Dennis' Car | |
getModel: function() { | |
return this.model; | |
} | |
}, HasWheels, HasHorn); | |
var HasBikeHorn = Object.assign({}, HasHorn, { hornSound: 'HONK!' }); | |
var Bike = Object.assign({}, HasWheels, { wheelCount: 2 }, HasBikeHorn, HasBasket); | |
// Create instances | |
var car = Object.create(Car); | |
console.log('CAR'); | |
console.log('---'); | |
console.log(car.getModel()); | |
console.log(car.getHornSound()); | |
console.log(car.getWheelCount()); | |
console.log('BIKE'); | |
console.log('----'); | |
var bike = Object.create(Bike); | |
console.log(bike.getHornSound()); | |
console.log(bike.getWheelCount()); | |
bike.addToBasket('newspapers', 0.5); | |
console.log(bike.getItemsInBasket()); | |
console.log(bike.getBasketCapacity()); | |
// Let's use a class to represent a Truck | |
var CarClass = function() {}; | |
CarClass.prototype = Car; | |
Object.assign(CarClass.prototype, HasBasket); | |
// Mixing in with classes needs wrapping, because you need to mix into the prototype not the constructor | |
// This could be wrapped in a mix() function | |
class Truck extends CarClass { | |
// Truck is just a car with a basket | |
} | |
console.log('TRUCK'); | |
console.log('-----'); | |
var truck = new Truck(); | |
console.log(truck.getHornSound()); | |
console.log(truck.getWheelCount()); | |
truck.addToBasket('lumber', 0.8); | |
console.log(truck.getItemsInBasket()); | |
console.log(truck.getBasketCapacity()); | |
})(); |
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$ babel-node mixins | |
CAR | |
--- | |
BEEP! | |
4 | |
BIKE | |
---- | |
HONK! | |
2 | |
[ 'newspapers' ] | |
0.5 | |
TRUCK | |
----- | |
BEEP! | |
4 | |
[ 'lumber' ] | |
0.8 |
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