Javascript stories

javascript-stories.js

// The quick brown fox jumps over the lazy dog

var hasAttributes = function (animal, attributes) {
  var matches = 0;
  for (var i = 0; i < attributes.length; i += 1) {
    if (animal.attributes.indexOf(attributes[i]) >= 0) {
      matches += 1;
    }
  }
  
  if (matches === attributes.length) {
    return true;
  }
  return false;
};

var the = function (attributes, species) {
  for (var a = 0; a < animals.length; a += 1) {
    if (animals[a].species === species && hasAttributes(animals[a], attributes)) {
      return animals[a];
    }
  }
  return undefined;
};

var animals = [
  {
    species: 'fox',
    attributes: ['quick', 'brown'],
    height: 20,
    jumpHeight: 64,
    jumpsOver: function (target) {
      return this.jumpHeight > target.height;
    }
  },
  {
    species: 'dog',
    attributes: ['lazy'],
    height: 32, 
    jumpHeight: 54
  }
];

the(['quick', 'brown'], 'fox').jumpsOver(the(['lazy'], 'dog'));

// How much wood would a woodchuck chuck if a woodchuck could chuck wood?

var aWoodchuck = {
  could: function (action, item) {
    if (this[action]) {
      return this[action][item] !== undefined;
    }
    return false;
  },
  chuck: {
    wood: 2,
    dirt: 3,
    grass: 4
  },
  canBeBotheredTo: [
    'chuck',
    'eat'
  ]
};
 
var would = function (animal, action) {
  return {
    'animal': animal,
    'action': action,
    'would': animal.canBeBotheredTo.indexOf(action) >= 0,
    'if': function (test) {
      var result = this;
      result.could = test;
      return result;
    }
  };
};
 
var howMuch = function (item, animal) {
  if (animal.could) {
    return animal.animal[animal.action][item];
  }
  return 0;
};
 
howMuch('wood', would(aWoodchuck, 'chuck').if(aWoodchuck.could('chuck', 'wood')) );

// Hello, world

var world = {
  population: 7.046 * 1000 * 1000,
  diameter: 12.742 * 1000,
  name: 'Earth',
  recievedMessages: []
};

var hello = function (thing) {
  thing.recievedMessages.push('Hello');
};

hello(world);