bicycleFinder.js

var bicycleFinder = (function() {
  "use strict";

  var getBicycles = function() {
    return [{
      id: 1,
      name: "A fast bike",
      type: "Road Bike",
      quantity: 10,
      rentPrice: 20,
      dateAdded: new Date(2015, 1, 2)
    }, {
      id: 2,
      name: "An even faster bike",
      type: "Road Bike",
      quantity: 4,
      rentPrice: 25,
      dateAdded: new Date(2015, 2, 25)
    }, {
      id: 3,
      name: "A springy bike",
      type: "Mountain Bike",
      quantity: 20,
      rentPrice: 18,
      dateAdded: new Date(2014, 10, 1)
    }, {
      id: 4,
      name: "A springier bike",
      type: "Mountain Bike",
      quantity: 10,
      rentPrice: 22,
      dateAdded: new Date(2014, 4, 1)
    }, {
      id: 5,
      name: "An all-terain bike",
      type: "Mountain Bike",
      quantity: 5,
      rentPrice: 27,
      dateAdded: new Date(2014, 8, 14)
    }, {
      id: 6,
      name: "A classy bike",
      type: "Urban Bike",
      quantity: 30,
      rentPrice: 15,
      dateAdded: new Date(2014, 6, 27)
    }, {
      id: 7,
      name: "A modern bike",
      type: "Urban Bike",
      quantity: 20,
      rentPrice: 17,
      dateAdded: new Date(2015, 1, 19)
    }, {
      id: 8,
      name: "A commuter bike",
      type: "Urban Bike",
      quantity: 12,
      rentPrice: 14,
      dateAdded: new Date(2014, 8, 2)
    }, {
      id: 9,
      name: "A blue bike",
      type: "Children Bike",
      quantity: 25,
      rentPrice: 10,
      dateAdded: new Date(2014, 10, 20)
    }, {
      id: 10,
      name: "A pink bike",
      type: "Children Bike",
      quantity: 25,
      rentPrice: 10,
      dateAdded: new Date(2015, 2, 5)
    }, {
      id: 11,
      name: "A noisy bike",
      type: "Children Bike",
      quantity: 3,
      rentPrice: 12,
      dateAdded: new Date(2014, 8, 23)
    }, {
      id: 12,
      name: "A clown bike",
      type: "Children Bike",
      quantity: 2,
      rentPrice: 12,
      dateAdded: new Date(2014, 11, 1)
    }];
  };

  return {
    findBicycle: function(type, maxRentPrice) {
      var bicycles = getBicycles();
      return _.find(bicycles, function(bicycle) {
        return bicycle.type === type && bicycle.rentPrice <= maxRentPrice;
      });
    },
    findBicycleById: function(id){
      var bicycles = getBicycles();
      return _.findWhere(bicycles, {id: id});
    },
    hasBicycle: function(type, maxRentPrice) {
      var bicycles = getBicycles();
      return _.some(bicycles, function(bicycle) {
        return bicycle.type === type && bicycle.rentPrice <= maxRentPrice;
      });
    },
    hasBicycleWithId: function(id) {
      var bicycles = getBicycles();
      var bicycleIds = _.pluck(bicycles,"id");
      return _.contains(bicycleIds, id);
    }
  };
}());