concatenar, atualizar e ordenar arrays

desafio34.js

const array1 = [
    [21, "Bowling Ball"],
    [2, "Dirty Sock"],
    [1, "Hair Pin"],
    [5, "Microphone"]
]

const array2 = [
	[2, "Hair Pin"],
    [3, "Half-Eaten Apple"],
    [67, "Bowling Ball"],
    [7, "Toothpaste"]
]

const merge = array1.concat( array2 )

// const order = (a, b) => b[0] - a[0]

const update = (total, item) => {
    total[item[1]] = total[item[1]] ? item[0] : item[0] 
    return total
}

const result = merge.reduce( update, {} )

console.log( result )

total[item[1]] = total[item[1]] ? total[item[1]] + item[0] : item[0]