comparing and adding items to array of objects

Question

The below code is supposed to:

1) go through the two arrays,

2) if an item exist in both arrays, add its value to the value of the similar item in the first arra

Answer 1

You are over-complicating things I think. Here's a working snippet.

function updateInventory(arr1, arr2) {
  for (var i = 0; i < arr2.length; i++) {
    var matchFound = false;
    for (var j = 0; j < arr1.length; j++) {
      if (arr1[j][1] === arr2[i][1]) {
        arr1[j][0] += arr2[i][0];
        matchFound = true;
      }
    }

    if (!matchFound) {
      arr1.push(arr2[i]);
    }
  }
  return arr1;
}


var curInv = [
  [21, "Bowling Ball"],
  [2, "Dirty Sock"],
  [2, "cat"],
];

var newInv = [
  [21, "Bowling Ball"],
  [2, "Dirty Sock"],
  [3, "rags"],
  [3, "mugs"]
];

console.log(updateInventory(curInv, newInv));

What it does

1. Loop through all of the elements in arr2.
2. Loop through all of the elements in arr1.
3. If a match is found, add the number of items in arr2 to the corresponding value in arr1.
4. If no match is found, add that element in arr2 to arr1.