javascript samples from week 1

average.js

function average(list) {
  var sum = 0;

  for (var num in list) {
    sum += list[num];
  }
  	return sum / list.length;
}  
console.log(average([20, 21, 220, 54]));

conceptList.js

// Author: Dave J

// take array ["gists", "types", "operators", "iteration", "problem solving"]
// and out put it with text to say
// Today I learned about gists, types, operators, iteration, problem solving.

var conceptList = ["gists", "types", "operators", "iteration", "problem solving"];

// without a function call
// var concepts = ("Today I learned about " + conceptList.toString() + ".").split(',').join(', ');
// console.log(concepts);

// with a function call
function joinList(List){
   var concepts = ("Today I learned about " + List.toString() + ".").split(',').join(', ');
   return concepts;
};
joinedList = joinList(conceptList);
console.log(joinedList);

countLetters.js

function countLetters(sentence) {
	var noSpaces = sentence.split(" ").join("");
    
    for (var i = 0; i <= noSpaces.length -1; i++) {
    	var letter = noSpaces[i];
		var num = -1;
		var pos = 0;
		var j = -1;
  		 while (pos != -1) {
  			
     		pos = noSpaces.indexOf(letter, j + 1);
     		num += 1;
     		j = pos; 		
   	  }
  		console.log(letter + ':' + num);
	}	
}
 var result = countLetters('the quick brown fox jumped over the lazy dog');

day-calculator.js

// Author: Dave J

var date = process.argv[2];

if (!date) {
  console.log("Please provide a date in the format YYYY/MM/DD");
} else {
  calculateDayInYear(date);
}

function calculateDayInYear(date) {
  var splitDate = date.split('/');
  var year = Number(splitDate[0]);
  var month = Number(splitDate[1]);
  var day = Number(splitDate[2]);
  var febDays = daysInFeb(year);
  var DAYS_IN_MONTH = [0, 31, febDays, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];

  if (year && validMonth(month) && validDay(month, day)) {
    console.log(date, "is day", calculateDayNumber(month, day), "of the year", year);
  } else {
        console.log(day);
        console.log(month);
        console.log(year);
    console.log("Invalid date");
  }

  function validMonth(month) {
       return month && month > 0 && month < 13;
 
  }

  function validDay(month, day) {
    return day && day > 0 && day < DAYS_IN_MONTH[month+1];
    
  }

  function calculateDayNumber(month, day) {
    var dayOfYear = day;
    console.log(dayOfYear);
    for (var i = 1; i <= month; ++i) {
      dayOfYear += DAYS_IN_MONTH[i-1];
      console.log(DAYS_IN_MONTH[i]);
    }

    return dayOfYear;
  }

  function daysInFeb(year) {
    if (((year % 100) != 0 || (year % 400) == 0) && (year % 4 == 0)) {
      return 29;
    } else {
      return 28;
    }
  }

}

dice-roller.js

// Author: Dave J

// node dice-roller.js 3  takes a numeric parameter and creates that many random dices rolls
// Rolled 3 dice: 2, 6, 5

function diceroller(num){
	for (var i = 0; i <= num-1;  i++) {
		var ranDice = Math.floor(6*Math.random())+1;
		console.log(ranDice)
	};
};
diceroller(5);

findWaldo.js

function findWaldo(arr, found) {
  for (var i = 0; i < arr.length; i++) {
    if (arr[i] === "Waldo") {
      found(i);   // execute callback with arguments
      
    } else {
    	console.log('didnt find him');
    }
  }
}

function actionWhenFound(index) {
  console.log("Found him!");
  console.log("He was found at Index " + index);
}

findWaldo(["Alice", "Bob", "Waldo", "Winston"], actionWhenFound);

findWaldorefactored.js

function actionWhenFound(element,index,array) {
  if (array[index] === "Waldo") {
      console.log("Found him!");   
      console.log("He was found at Index " + index);
    } else {
    	console.log('didnt find him');
  }  
}
["Alice", "Bob", "Waldo", "Winston"].forEach(actionWhenFound);// execute callback

loadedDie

// Dave J
var loadedDie = (function () {
  var list = [3, '.',1, 4, 1, 5, 9, 2, 6];
  var dieNum = 0
  list[dieNum];
  return function () {
  	return list[dieNum++];
  }
})();


console.log(loadedDie());  // 3
console.log(loadedDie());  // .
console.log(loadedDie());  // 1
console.log(loadedDie());  // 4
console.log(loadedDie());  // 1  ... or pi


// var rollDie = function (){
//	return Math.floor(1 + Math.random() *6);
// }
// console.log(rollDie()); //real

loopylighthouse.js

// Author: Dave J

// prints the numbers from 100 to 200 to the console, with three exceptions:

// If the number is a multiple of 3, print the String "Loopy".
// If the number is a multiple of 4, print the String "Lighthouse".
// If the number is a multiple of both 3 and 4, print the String "LoopyLighthouse"


for (var i = 100; i <= 200; i++) {
  var lo = i % 3 == 0;
  var li = i % 4 == 0;
  console.log(lo ? li ? "LoopyLighthouse" : "Loopy" : li ? "Lighthouse" : i);
}

mapexample.js

// Author : Dave J
var input = [
  { x: 3, y: 4 },
  { x: 12, y: 5 },
  { x: 8, y: 15 }
];

// z = Math.sqrt(input(x)^ + input(y)^);

var result = input.map(function(obj){ 
	return Math.sqrt(Math.pow(obj.x, 2) + Math.pow(obj.y, 2) );
});

console.log(result[0] === 5);
console.log(result[1] === 13);
console.log(result[2] === 17);

muslib.js

// Author DaveJ

// implement the following functions on this data
// add Library, Tracks, Playlists,
// add Playlists to libraries and Tracks to Playlists
// calculate properties like total length, average rating
// Output any object

function Library(name, owner){
  this.playlist = [],
  this.name = name,
  this.owner = owner
}

function Playlist(name){
  this.name = name,
  this.tracks = []
}

function Track(name,artist,album,rating,length){
  this.name = name,
  this.artist = artist,
  this.album = album,
  this.rating = rating,
  this.length = Number(length)
}

Library.prototype.addPlaylistToLib = function(playlist) { return this.playlist.push(playlist) }

Playlist.prototype.addTrackToPlaylist = function(track) { return this.tracks.push(track) }

Object.defineProperty(Playlist.prototype, "duration",{
 get: function(){
  let totalLength = 0;
  this.tracks.forEach((track)=>{
    totalLength += track.length;
  })
  return totalLength;
 }
});

Object.defineProperty(Playlist.prototype, "avgRating",{
 get: function(){
  let totalratings = 0;
  let i = 0;
  this.tracks.forEach((track)=>{
    totalratings += track.rating;
    i++;
  })
  return totalratings/i  ;
 }
});

// create a library
let library = new Library('MyCDs','Jellyman');

// create tracks
let sting = new Track('Ships','Sting','Dead Mans Boots', 5, 182);
let sting2 = new Track('Soul Cages','Sting','Englishman in NY', 4, 132);
let jarrett = new Track('Paris','Keith Jarrett','Part 1', 5, 1000);
let jarrett2 = new Track('Koln Concerts','Keith Jarrett','Part 2', 3, 560);

//create playlists
let chill = new Playlist('chill');
chill.addTrackToPlaylist(sting);
chill.addTrackToPlaylist(sting2);

let jazz = new Playlist('jazz');
jazz.addTrackToPlaylist(jarrett);
jazz.addTrackToPlaylist(jarrett2);

// add playlists to the library
library.addPlaylistToLib(chill);
library.addPlaylistToLib(jazz);

// out print results
console.log(library['name']);
console.log(library['playlist']);
console.log(chill.name);
console.log(sting.name);
console.log(chill.duration);
console.log(chill.avgRating);

palindrome.js

function isPalindrome(str) {
  var noSpaces = str.split(" ").join("");
  console.log(str);
   console.log(noSpaces);
  var mid = Math.floor(noSpaces.length/2);
   console.log(mid);
  var last = noSpaces.length - 1;
   console.log(last);

  for (var i = 0; i < mid; i++) {
    if (str[i] != str[last-i]) {
    	return false;
    }
    }
}

// Test driver code. These should all log true.
// console.log(isPalindrome('p') === true);
// console.log(isPalindrome('foo') === false);
// console.log(isPalindrome('racecar') === true);
// console.log(isPalindrome('Kayak') === true);
console.log(isPalindrome('a santa at NASA') === true);
// console.log(isPalindrome('live without evil') === false);
// console.log(isPalindrome('just some random words') === false);
// console.log(isPalindrome('kayak') === true);

password.js

// Author Dave j
// These are the rules
 
    // Every "a" in the string should be replaced with a "4".
    // Every "e" in the string should be replaced with a "3".
    // Every "o" (oh) in the string should be replaced with a "0" (zero).
    // Every "l" (el) in the string should be replaced with a "1" (one).

function obfuscate(word){
   var obWord = word.replace(/a/g, '4').replace(/e/g, '3').replace(/o/g, '0').replace(/l/g, '1');
   return obWord
};
var obfuscatedWord = obfuscate("abracadabra");
console.log(obfuscatedWord);
var obfuscatedWord = obfuscate("password");
console.log(obfuscatedWord);
var obfuscatedWord = obfuscate("audaciously");
console.log(obfuscatedWord);

piglatin.js

var originalWords = process.argv.slice(2);
var pigLatinWords = [];

for (var i = 0; i < originalWords.length; i++) {
  pigLatinWords.push(translateToPigLatin(originalWords[i]));
}

console.log(pigLatinWords.join(' '));

function translateToPigLatin(word) {
  return word.slice(1, word.length) + word[0] + "ay";
}

reverse.js

var input = process.argv[2];

function reverse(original) {
  return original.split("").reverse().join("");
}

if (input){
  console.log(reverse(input));
}

sumarray1.js

//Author DaveJ

var salesTaxRates = {
  AB: 0.05,
  BC: 0.12,
  SK: 0.10
};

var companySalesData = [
  {
    name: "Telus",
    province: "BC",
    sales: [ 100, 200, 400 ]
  },
  {
    name: "Bombardier",
    province: "AB",
    sales: [ 80, 20, 10, 100, 90, 500 ]
  },
  {
    name: "Telus",
    province: "SK",
    sales: [ 500, 100 ]
  }
];

function getSum(total, num) {
    return total + num;
}

for(var i = 0; i < companySalesData.length; i++) {
	var arrayitem = companySalesData[i];
	var tax = 0.10; //tax for SK
	var arraysales = arrayitem.sales;
	var reducedarray = arraysales.reduce(getSum)
	

	var prov = arrayitem['province'];
	(arrayitem['province'] === 'BC') ? (tax = 0.12) : (tax = 0.10);
	(arrayitem['province'] === 'AB') ? (tax = 0.12) : (tax = 0.10);
	
	console.log(arrayitem["name"] + ": ");
	console.log("TotalSales are:" + reducedarray);
	console.log("TotalTaxes are:" + (reducedarray * tax));
	
}