'use strict';

function Allergies(allergenIndex) {

this.allergenIndex = allergenIndex;

}

Allergies.possibleAllergies = [ 'eggs', 'peanuts', 'shellfish', 'strawberries',

'tomatoes', 'chocolate', 'pollen', 'cats'];

Allergies.prototype = {

list: function () {

var possibleAllergies = Allergies.possibleAllergies;

var allergicTo = [];

for (var i = 0; i < possibleAllergies.length; i++) {

var allergy = possibleAllergies[i];

if (this.allergenIndex & Math.pow(2, i)) {

allergicTo.push(allergy);

}

}

return allergicTo;

},

allergicTo: function (food) {

var isAllergic = false;

var allergyList = this.list();

for (var i = 0; i < allergyList.length; i++) {

if (allergyList[i] === food) {

isAllergic = true;

break;

}

}

return isAllergic;

}

};

module.exports = Allergies;