Exercises: Objects

The Recipe Card

Never forget another recipe!

• Create an object to hold information on your favorite recipe. It should have properties for title (a string), servings (a number), and ingredients (an array of strings).
• On separate lines (one console.log statement for each), log the recipe information so it looks like:
  • Mole
  • Serves: 2
  • Ingredients:
  • cinnamon
  • cumin
  • cocoa

See Solution

 var recipe = {
    'title': 'Mole',
    'servings': 2,
    'ingredients': ['cumin', 'cinnamon', 'cocoa']
};

console.log(recipe.title);
console.log('Servings: ' + recipe.servings);
console.log('Ingredients:');
for (var i = 0; i < recipe.ingredients.length; i++) {
    console.log(recipe.ingredients[i]);
}

The Reading List

Keep track of which books you read and which books you want to read!

• Create an array of objects, where each object describes a book and has properties for the title (a string), author (a string), and alreadyRead (a boolean indicating if you read it yet).
• Iterate through the array of books. For each book, log the book title and book author like so: "The Hobbit by J.R.R. Tolkien".
• Now use an if/else statement to change the output depending on whether you read it yet or not. If you read it, log a string like 'You already read "The Hobbit" by J.R.R. Tolkien', and if not, log a string like 'You still need to read "The Lord of the Rings" by J.R.R. Tolkien.'

See Solution

var books = [
  {title: 'The Design of EveryDay Things',
   author: 'Don Norman',
   alreadyRead: false
  },
  {title: 'The Most Human Human',
  author: 'Brian Christian',
  alreadyRead: true
  }];

for (var i = 0; i < books.length; i++) {
  var book = books[i];
  var bookInfo = book.title + '" by ' + book.author;
  if (book.alreadyRead) {
    console.log('You already read "' + bookInfo);
  } else {
    console.log('You still need to read "' + bookInfo);
  }
}