numDuplicates example

numDuplicates.js

function logItem() {
  console.log(Array.from(arguments).join("\t"))
}

function numDuplicates(name, price, weight) {
  const uniqueItems = new Set()

  name.forEach(
    (item, index) => {
      const itemPrice = price[index]
      const itemWeight = weight[index]
      logItem(item, itemPrice, itemWeight)

      uniqueItems.add(`${item}_${itemPrice}_${itemWeight}`)
    }
  )

  return name.length - uniqueItems.size
}

/* 
// 1
const name = ['ball', 'bat', 'glove', 'glove', 'glove']
const price = [2, 3, 1, 2, 1]
const weight = [2, 5, 1, 1, 1] 
*/

// 2
const name = ['ball', 'box', 'ball', 'ball', 'box']
const price = [2, 2, 2, 2, 2]
const weight = [1, 2, 1, 1, 3]

const count = numDuplicates(name, price, weight)

console.log(`# duplicated items: ${count}`)