JavaScript实现多人分摊费用计算器：文本输入姓名，自动计算平均分摊额

<h1>Expenses app</h1>
<p>Enter how much each person spent</p>

<p>Nombre</p>
<input type="text" id="nombre">
<br>
<p>Monto</p>
<input type="number" id="monto">
<br>
<button onclick="ir()">Enviar</button>
<br>
<p>Total: <span id="final"></span> </p>
<div id="list"></div>
<div id="total"></div>
<div id="total-people"></div>
<p id="average"></p>
<p>A cada uno le toca aportar: <span id="aporte"></span></p>

const arr = []
const nombre = document.getElementById("nombre")
const monto = document.getElementById("monto")
const total = document.getElementById("total")
const final = document.getElementById("final")
const aporte = document.getElementById("aporte")
const list = document.getElementById("list")
const average = document.getElementById("average")
function ir() {
    let nombreVal = nombre.value
    let montoVal = monto.value
    if(nombreVal === '' || montoVal === '') return
    let exist = arr.find(({name, score}) => name === nombreVal)
    if (exist) {
      exist.score = Number(montoVal)
    } else {
      arr.push({name:nombreVal, score: montoVal})
    }
    let totalScore = arr.reduce((total, ele) => total += Number(ele.score), 0)
    let totalPeople = arr.length
    list.textContent  = '';
    arr.forEach(ele => {
      let nodeNombre = document.createElement('p')
      nodeNombre.innerHTML = ele.name + ': ' + ele.score
      list.appendChild(nodeNombre);
    })

    final.innerHTML = `${totalScore}`;
    aporte.innerHTML = `${totalPeople}`;
    average.innerHTML =  `average : ${totalScore/totalPeople}`
  };