4 Bonfire Inventory Update.js

/* Bonfire: Inventory Update
Difficulty: 4/5

Compare and update inventory stored in a 2d array against a second 2d array of a fresh delivery. Update current inventory item quantity, and if an item cannot be found, add the new item and quantity into the inventory array in alphabetical order.

Remember to use Read-Search-Ask if you get stuck. Try to pair program. Write your own code.

Here are some helpful links:

Global Array Object

Code by Rafael Rodriguez
rafase282@gmail.com
http://www.freecodecamp.com/rafase282
*/

function inventory(arr1, arr2) {
  // All inventory must be accounted for or you're fired!

  var index;
  var arrCurInvName = []; // Names of arr1's items
  var arrNeInvName = []; // Names of arr2's items

  // Same as using two for loops, this takes care of increasing the number of stock quantity.
  arr1.map(function(item1) {
    return arr2.map(function(item2) {
      if (item1[1] === item2[1]) {
        item1[0] = item1[0] + item2[0]; //Increase number of stock
      }
    });
  });

  // Get item's name for new Inventory
  arr2.map(function(item) {
    arrNeInvName.push(item[1]);
  });

  // Get item's name for Current Inventory
  arr1.map(function(item) {
    arrCurInvName.push(item[1]);
  });

  // Add new inventory items to current inventory.
  arrNeInvName.map(function(item) {
    if (arrCurInvName.indexOf(item) === -1) {
      index = arrNeInvName.indexOf(item);
      arr1.push(arr2[index]);
    }
  });

  // Sort the array alphabetically using the second element of the array as base.
  arr1.sort(function(currItem, nextItem) {

    //Ternary function to avoid using if else
    return currItem[1] > nextItem[1] ? 1 : -1;
  });

  return arr1;
}

// Example inventory lists
var curInv = [
  [21, 'Bowling Ball'],
  [2, 'Dirty Sock'],
  [1, 'Hair Pin'],
  [5, 'Microphone']
];

var newInv = [
  [2, 'Hair Pin'],
  [3, 'Half-Eaten Apple'],
  [67, 'Bowling Ball'],
  [7, 'Toothpaste']
];

inventory(curInv, newInv);