data merge

function mergeDataStreams(stream1, stream2) {
  var results = {};
  for (var i=0; i < stream1.length; i++) {
    results[stream1[i].id] = stream1[i];
  }
  
  for (var key in results) {
    var otherData = stream2.find(
      function(item) { return item.id === key; });
    for (var _key in otherData) {
      results[key][_key] = otherData[_key];
    }
  }
  return Object.keys(results).map(function(item) {return results[item]; });
}

// data
var dataSource1 = [
    {
      id: '0',
      firstName: 'Juan',
      lastName: 'Doe',
      age: 32
    },
    {
      id: '1',
      firstName: 'Jane',
      lastName: 'Doe',
      age: 31
    },
    {
      id: '2',
      firstName: 'Janice',
      lastName: 'Doe',
      age: 30
    },
    {
      id: '3',
      firstName: 'Jake',
      lastName: 'Doe',
      age: 29
    },
  ];

var dataSource2 = [
    {
      id: '0',
      occupation: 'architect',
      address: {
        street: '123 Main St',
        city: 'CityTown',
        country: 'USA'
      }
    },
    {
      id: '1',
      occupation: 'architect',
      address: {
        street: '234 Main St',
        city: 'CityTown',
        country: 'USA'
      }
    },
    {
      id: '2',
      occupation: 'architect',
      address: {
        street: '345 Main St',
        city: 'CityTown',
        country: 'USA'
      }
    },
    {
      id: '3',
      occupation: 'architect',
      address: {
        street: '456 Main St',
        city: 'CityTown',
        country: 'USA'
      }
    },
  ];




/* From here down, you are not expected to 
   understand.... for now :)  
   
   
   Nothing to see here!
   
*/



// tests 
function testMergeDataStreams(stream1, stream2) {
  var expected = stream1.map(function(item) {
   return _.assign(
     _.clone(item), stream2.find(function(item2) {return item.id === item2.id;}));
  });
  
  var actual = mergeDataStreams(stream1, stream2);
  
  var passing = actual && expected.map(function(item) {
    return _.isEqual(
      item,
      actual.find(function(_item) {return _item.id === item.id; })
    );
  }).every(function(result) {return result;} );
  
  if (passing) {
    console.log('SUCCESS! mergeDataStreams works');
  }
  
  else {
    console.log('FAILURE! mergeDataStreams not working');
  }
}

testMergeDataStreams(dataSource1, dataSource2);

most frequent word

function mostFrequentWord(words) {
  var wordFrequencies = {};
  for (var i = 0; i <= words.length; i++) {
    if (words[i] in wordFrequencies) {
      wordFrequencies[words[i]]++;
    }
    else {
      wordFrequencies[words[i]]=1;
    }
  }
  var currentMaxKey = Object.keys(wordFrequencies)[0];
  var currentMaxCount = wordFrequencies[currentMaxKey];
  
  for (var word in wordFrequencies) {
    if (wordFrequencies[word] > currentMaxCount) {
      currentMaxKey = word;
      currentMaxCount = wordFrequencies[word];
    }
  }
  return currentMaxKey;
}



/* From here down, you are not expected to 
   understand.... for now :)  
   
   
   Nothing to see here!
   
*/


function getTokens(rawString) {
  // returns an alphabetically sorted list of words, removing punctuation
  // characters
  return rawString.toLowerCase().split(/[ ,!.";:-]+/).filter(Boolean).sort();
}


// `getTokens` returns an alphabetically sorted list of words

(function testMostFrequentWord() {
 var spaceOddityText = 'Ground Control to Major Tom\n \
Ground Control to Major Tom\n \
Take your protein pills and put your helmet on\n \
Ground Control to Major Tom (ten, nine, eight, seven, six)\n \
Commencing countdown, engines on (five, four, three)\n \
Check ignition and may God\'s love be with you (two, one, liftoff)\n \
\n \
This is Ground Control to Major Tom\n \
You\'ve really made the grade\n \
And the papers want to know whose shirts you wear\n \
Now it\'s time to leave the capsule if you dare\n \
"This is Major Tom to Ground Control\n \
I\'m stepping through the door\n \
And I\'m floating in a most peculiar way\n \
And the stars look very different today\n \
For here\n \
Am I sitting in a tin can\n \
Far above the world\n \
Planet Earth is blue\n \
And there\'s nothing I can do\n \
\n \
Though I\'m past one hundred thousand miles\n \
I\'m feeling very still\n \
And I think my spaceship knows which way to go\n \
Tell my wife I love her very much she knows\n \
Ground Control to Major Tom\n \
Your circuit\'s dead, there\'s something wrong\n \
Can you hear me, Major Tom?\n \
Can you hear me, Major Tom?\n \
Can you hear me, Major Tom?\n \
Can you \"Here am I floating \'round my tin can\n \
Far above the moon\n \
Planet Earth is blue\n \
And there\'s nothing I can do\"';
  
 var expected = 'major';
 var actual = mostFrequentWord(getTokens(spaceOddityText));
 if (expected === actual) {
   console.log('SUCCESS: `mostFrequentWord` is working');
 }
 else {
   console.log('FAILURE: `mostFrequentWord` is not working');
 }
})();

recipe generator

function recipeFactory(name, ingredients, steps) {
  return {
    name: name,
    ingredients: ingredients,
    steps: steps,
    stepsHtml: function() {
      return '<ol>' + this.steps.map(
        function(step) {return '<li>' + step + '</li>'; }).join('') + '</ol>';
    },
    ingredientsHtml: function() {
      return '<ul>' + this.ingredients.map(
        function(ing) {return '<li>' + ing + '</li>'; }).join('') + '</ul>';
    }
  }
}


// tests

function testRecipeFactory() {  
  var grilledCheese = recipeFactory(
    'grilled cheese',
    ['2 slices bread', 'butter', '1 slice cheese'],
    ['Butter bread', 'Put cheese between bread', 'Toast bread on stove']
  ); 
  if (grilledCheese) {
    // `$` is a shortcut to the jQuery library, which
    // you'll learn about in the next unit.
    // Here, we're using jQuery to update elements in the HTML
    $('.js-recipe-name').text(grilledCheese.name);
    $('.js-ingredients').html(grilledCheese.ingredientsHtml());
    $('.js-steps').html(grilledCheese.stepsHtml());
  }
}

testRecipeFactory()