我是一个初学者，我正在学习JS。我想知道如何在下面的代码中写一个开关内的函数（如果可能的话），把代码变小。
我试着把每个操作的函数放在开关里面，但是从来没有成功过。请帮助我改进我的代码。谢谢！

//Calculator of Basic Operations

function addition(a, b) {
  return (a + b);
}

function subtraction(a, b) {
  return (a - b);
}

function multiplication(a, b) {
  return (a * b);
}

function division(a, b) {
  return (a / b);
}

console.log('Choose the number for the operation you want to use.');
console.log('1 - Addition');
console.log('2 - Subtraction');
console.log('3 - Multiplication');
console.log('4 - Division');

let calcAB = prompt('Operation: ');

switch (calcAB) {

  case '1':
    a = Number(prompt('Enter the value for A: '));
    b = Number(prompt('Enter the value for B: '));
    console.log(`The addition result is "${addition(a, b)}"`);
    break;

  case '2':
    a = Number(prompt('Enter the value for A: '));
    b = Number(prompt('Enter the value for B: '));
    console.log(`The subtraction result is "${subtraction(a, b)}"`);
    break;

  case '3':
    a = Number(prompt('Enter the value for A: '));
    b = Number(prompt('Enter the value for B: '));
    console.log(`The multiplication result is "${multiplication(a, b)}"`);
    break;

  case '4':
    a = Number(prompt('Enter the value for A (dividend): '));
    b = Number(prompt('Enter the value for B (divisor): '));
    console.log(`The division result is "${division(a, b)}"`);
    break;
}