JavaScript Object Composition techniques

javascriptObjectComposition.js

/***** SETUP *****/

  // Constructor
  function Car(model) {
    this.model = model
  }

  // Factory
  function Truck(model) {
    return {
      model
    }
  }

  // Object literal
  const Moto = {}


  /***** Assign and Augment Prototypes  *****/

  // Constructor
  const mazda = new Car('miata')

  Car.prototype.getModel = function() {
    console.log(this.model)
  }

  // Factory
  const chevy = Truck('silverado')

  Truck.prototype.getModel = function() {
    console.log(this.model)
  }

  Object.setPrototypeOf(chevy, Truck.prototype)

  // Object.create
  const triumph = Object.create(Moto)
  triumph.model = 'bonnevile'
  Moto.getModel = function() {
    console.log(this.model)
  }

  /***** Functional Concatenative -- No prototype *****/

  function Plane(spec) {
    const 
    {model} = spec,
    getModel = function() {
      console.log(model)
    }
    return Object.freeze({
      getModel
    })
  }

  const airbus = Plane({
    model: 'a320'
  })

  /***** Example *****/

  function createSnake(spec) {
    const 
    {name, age, hostilityLevel} = spec,
    species = 'Snake',
    thermoregulation = 'ectothermic',
    venemous = true,
    getName = function() {
      return name
    }
    bite = function() {
      return 'OUCH!'
    },
    pet = function() {
      if(hostilityLevel > 7) {
        return `You've been bitten by ${name} the ${species}`
      }
      else {
        return 'Purrrr'
      }
    },
    isColdBlooded = function() {
      if(thermoregulation === 'ectothermic')  {
        return true
      }
    }

    return Object.freeze({
      getName,
      bite,
      venemous,
      pet,
      isColdBlooded
    })
  }

  function createElephant(spec) {
    const 
    {name, age, hostilityLevel} = spec,
    species = 'Elephant',
    thermoregulation = 'endothermic',
    hair = true,
    getName = function() {
      return name
    }
    eatPeanut = function() {
      return 'nom nom nom'
    },
    pet = function() {
      if(hostilityLevel > 7) {
        return `You've been bitten by ${name} the ${species}`
      }
      else {
        return 'Purrrr'
      }
    }

    return Object.freeze({
      getName,
      hair,
      thermoregulation,
      pet
    })
  }

  function createFish(spec) {
    const
    {name, age, hostilityLevel} = spec,
    species = 'Fish',
    thermoregulation = 'ectothermic',
    swims = true,
    getName = function() {
      return name
    }
    swim = function() {
      return `Swim, ${name} swim!`
    },
    pet = function() {
      if(hostilityLevel > 7) {
        return `You've been bitten by ${name} the ${species}`
      }
      else {
        return 'Purrrr'
      }
    }

    return Object.freeze({
      getName,
      swims,
      pet,
      swim
    })
  }

  function createBird(spec) {
    const 
    {name, age, hostilityLevel} = spec,
    species = 'Bird',
    thermoregulation = 'endothermic',
    laysEgg = true,
    getName = function() {
      return name
    },
    fly = function() {
      return 'Let the eagle  SOOOOAAAAR!!!'
    },
    pet = function() {
      if(hostilityLevel > 7) {
        return `You've been bitten by ${name} the ${species}`
      }
      else {
        return 'Purrrr'
      }
    }

    return Object.freeze({
      getName,
      laysEgg,
      pet
    })
  }

  function createPlatypus(spec) {
    const 
    {name, age, hostilityLevel} = spec,
    species = 'Platypus',
    {venemous} = createSnake(spec),
    {thermoregulation, hair} = createElephant(spec),
    {swims, swim} = createFish(spec),
    {laysEgg} = createBird(spec),
    getName = function() {
      return name
    },
    pet = function() {
      if(hostilityLevel > 7) {
        return `You've been bitten by ${name} the ${species}`
      }
      else {
        return 'Purrrr'
      }
    },
    isMature = function() {
      return age > 2 ? true : false
    }

    return Object.freeze({
      getName,
      venemous,
      hair,
      swims,
      swim,
      laysEgg,
      pet,
      isMature
    })
  }

/*
const perry = createPlatypus({
  name: 'Perry',
  age: 4,
  hostilityLevel: 8
})
*/