how to make a calculator websitejs

1let add =(...params) => {
2    let sum = 0;
3    params.forEach(el =>{
4        sum = sum + parseInt(el);
5    })
6    return sum
7}
8
9document.querySelector('.add').addEventListener('click' , function (e) {
10    const adder = document.querySelector('.addinput').value 
11    const meow = adder.split(',')
12    let result = add(...meow)
13    if (isNaN(result)) {
14        result = 'ENTER A NUMBER'
15    }
16    document.querySelector('.result').textContent = result
17})
18
19let times =(...params) => {
20    let multiply = 1;
21    params.forEach(el =>{
22        multiply = multiply * el;
23    })
24    return multiply
25}
26
27document.querySelector('.multiply').addEventListener('click' , function (e) {
28    const multiplier = document.querySelector('.multiplyinput').value 
29    const moo = multiplier.split(',')
30    let product = times(...moo)
31    if (isNaN(product)) {
32        product = 'ENTER A NUMBER'
33    }
34    document.querySelector('.product').textContent = product
35})
36
37let subtract =(...params) => {
38    let diff = 0;
39   diff = params[0] - params[1]
40    return diff
41}
42
43document.querySelector('.subtract').addEventListener('click' , function (e) {
44    const subtracter = document.querySelector('.subtractinput').value 
45    const woof = subtracter.split(',')
46    let diff = subtract(...woof)
47    if (isNaN(diff)) {
48        diff = 'ENTER A NUMBER'
49    }
50    document.querySelector('.difference').textContent = diff
51})
52
53let divide =(...params) => {
54    let quotient = 0;
55    quotient = params[0] / params[1]
56    return quotient
57}
58
59document.querySelector('.divide').addEventListener('click' , function (e) {
60    const divider = document.querySelector('.divideinput').value 
61    const moo2 = divider.split(',')
62    let quotient = divide(...moo2)
63    if (isNaN(quotient)) {
64        quotient = 'ENTER A NUMBER'
65    }
66    document.querySelector('.quotient').textContent = quotient
67})
68