index.js

// PocketPantry — Unit 0 Final Practice Code Examples
// One example per coding-skill module from Unit 0.
// The shared scenario: a kitchen/pantry management app called PocketPantry
// that helps users track inventory, suggest recipes, and reduce food waste.

// =====================================================================
// Module: Values, Data Types, and Operations
// Pseudocode:
//   - A pantry item is a record of name (string), quantity (number),
//     pricePerUnit (number), isExpired (boolean), and category (string).
//   - Compute the total value of one stocked item using arithmetic.
// =====================================================================
const itemName = "Whole Milk";               // string value
const quantity = 2;                          // number value
const pricePerUnit = 3.49;                   // number value
const isExpired = false;                     // boolean value
const category = "Dairy";                    // string value
const totalValue = pricePerUnit * quantity;  // arithmetic operation
console.log(`Total value of ${itemName}: $${totalValue.toFixed(2)}`);
console.log(`Category: ${category} | Expired? ${isExpired}`);

// =====================================================================
// Module: Stringing Characters Together
// Pseudocode:
//   - Build a multi-line shopping list export using template literals,
//     escape characters for an apostrophe inside an item name, and
//     special characters \n and \t for layout.
// =====================================================================
const ownerFirstName = itemName.split(" ")[0];
const shoppingList = `Shopping List for ${ownerFirstName}'s House:\n- Eggs\t6\n- \"Baker's Chocolate\"\t1\n- Tomatoes\t3`;
console.log(shoppingList);

// =====================================================================
// Module: Control Structures and Logic
// Pseudocode:
//   - Decide whether the user can make a recipe.
//   - Required: eggs AND milk AND (cheese OR butter).
//   - Forbidden: any allergen.
// =====================================================================
const hasEggs = true;
const hasMilk = true;
const hasCheese = false;
const hasButter = true;
const containsPeanuts = false;
if ((hasEggs && hasMilk && (hasCheese || hasButter)) && !containsPeanuts) {
  console.log("You can make this recipe!");
} else {
  console.log("Missing ingredients or contains an allergen.");
}

// =====================================================================
// Module: Building Arrays
// Pseudocode:
//   - Pantry: array of mixed-type item records.
//   - Weekly meal plan: 2D array (7 days x 3 meal slots) built with Array(n).
// =====================================================================
const pantry = [
  ["Milk", 2, 3.49, false, "Dairy"],
  ["Eggs", 12, 4.99, false, "Dairy"],
  ["Flour", 1, 2.79, false, "Baking"]
];
const mealPlan = new Array(7).fill(null).map(function () {
  return ["Oats", "Sandwich", "Pasta"];
});
console.log("Pantry:", pantry);
console.log("Wednesday lunch:", mealPlan[2][1]);

// =====================================================================
// Module: Using Arrays
// Pseudocode:
//   - Manage a shopping list using .length, bracket notation, push, includes,
//     indexOf, and splice.
// =====================================================================
const shoppingItems = ["Tomatoes", "Bread"];
shoppingItems.push("Cheese");
console.log(`You have ${shoppingItems.length} items on the list.`);
console.log("First item:", shoppingItems[0]);
if (shoppingItems.includes("Bread")) {
  const breadIndex = shoppingItems.indexOf("Bread");
  shoppingItems.splice(breadIndex, 1);
  console.log("Bread removed. Updated list:", shoppingItems);
}

// =====================================================================
// Module: Working With Loops
// Pseudocode:
//   - Walk every pantry item with a for loop bounded by .length.
//   - Warn the user for each expired entry.
// =====================================================================
for (let i = 0; i < pantry.length; i++) {
  const itemRecord = pantry[i];
  const name = itemRecord[0];
  const expiredFlag = itemRecord[3];
  if (expiredFlag) {
    console.log(`WARNING: ${name} is expired.`);
  } else {
    console.log(`OK: ${name} is fresh.`);
  }
}