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@liammclennan
Last active April 20, 2016 21:39
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// selectGame is a function that builds the data model for a game, by randomly selecting a set of books and a correct answer.
var selectGame = function () {
// `this` within selectGame is the array `data`. `reduce` is used to flatten the set of books into a single array.
// `_.shuffle` randomizes the list of books.
// `slice` selects the first 4 books.
// `books` is then 4 randomly selected books.
var books = _.shuffle(this.reduce(function (p, c, i) {
return p.concat(c.books);
}, [])).slice(0,4);
// `answer` is the one book (from books) randomly selected to be the answer
var answer = books[_.random(books.length-1)];
return {
books: books,
// `author` is the author of the book selected to be the answer. This has to be looked up in `data`.
author: _.find(this, function (author) {
return author.books.some(function (title) {
return title === answer;
});
}),
// `checkAnswer` is a function used within the game to check if the user's selection is the correct answer.
checkAnswer: function (title) {
return this.author.books.some(function (t) {
return t === title;
});
}
};
};
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