last koans

ingredient.occurrence.js

it("should count the ingredient occurrence (functional)", function () {
  var ingredientCount = { "{ingredient name}": 0 };

  _(products).chain()
    .map(function(product) { return product.ingredients; })
    .flatten()
    .reduce(function(list, ingredient) {
      ingredientCount[ingredient] = (ingredientCount[ingredient] || 0) + 1;
    });
    
  /* chain() together map(), flatten() and reduce() */

  expect(ingredientCount['mushrooms']).toBe(2);
});