function updateInventory(arr1, arr2) {




  arr1.map(par => {


    for (let i = 0; i < arr2.length; i++) {

      if (par[1] === arr2[i][1]) {

        par[0] = par[0] + arr2[i][0];

      }

    }

  });




  arr1 = arr1.concat(arr2);


  arr1 = arr1.sort((firstEl, secondEl) => {

    return firstEl[1][0].charCodeAt(0) - secondEl[1][0].charCodeAt(0);

  });




  for (let i = 0; i < arr1.length - 1; i++) {


    if (arr1[i][1] === arr1[i + 1][1]) {

      if (arr1[i][0] > arr1[i + 1][0]) {

        arr1.splice(i + 1, 1);

      } else if (arr1[i][0] < arr1[i + 1][0]) {

        arr1.splice(i, 1);

      } else {

        arr1.splice(i, 1);

      }



    }


  }







  return arr1;


}




// Example inventory lists

var curInv = [[0, "Bowling Ball"], [0, "Dirty Sock"], [0, "Hair Pin"], [0, "Microphone"]];

var newInv = [[1, "Hair Pin"], [1, "Half-Eaten Apple"], [1, "Bowling Ball"], [1, "Toothpaste"]];



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