my mathematical functions are returning NaN

Question

so I have been asking to change my code to simplify my functions but now that i have simpliftied them they are now only returning NaN and i dont really understand why that is, when the input is numbers?

// the purpose of this script is to execute different functions on an array of 3 integers// 
const input = [6, 25, 11];
const findSum = input.reduce((acc, num) => acc + num, 0);
console.log(findSum);

// each function has been assigned parameters to execute //
const subsFrom = (num1, num2, num3) => num1 - num2 - num3;
const subNum = subsFrom(input);
console.log(subNum);
// then call the function and display the answer //

const multiBy = (num1, num2, num3) => num1 * num2 * num3;
const multiNum = multiBy(input)
console.log(multiNum);

const divBy = (findSum, num1, num2, num3) => findSum / num1 / num2 / num3;
const divNum = divBy(findSum, input);
console.log(divNum);

Answer 1

When destructuring the array as params, you need to add the square brackets in the param list.

const subsFrom = ([num1, num2, num3])
const multiBy = ([num1, num2, num3])
const divBy = (findSum, [num1, num2, num3])

Since input is an array being passed into the function call.

// the purpose of this script is to execute different functions on an array of 3 integers// 
const input = [6, 25, 11];
const findSum = input.reduce((acc, num) => acc + num, 0);
console.log(findSum);

// each function has been assigned parameters to execute //
const subsFrom = ([num1, num2, num3]) => num1 - num2 - num3;
const subNum = subsFrom(input);
console.log(subNum);
// then call the function and display the answer //

const multiBy = ([num1, num2, num3]) => num1 * num2 * num3;
const multiNum = multiBy(input)
console.log(multiNum);

const divBy = (findSum, [num1, num2, num3]) => findSum / num1 / num2 / num3;
const divNum = divBy(findSum, input);
console.log(divNum);

Alternatively, you can spread the input array values into the function call. This way you do not need to add the square brackets to destructure the incoming array.

const divBy = (findSum, num1, num2, num3) => findSum / num1 / num2 / num3;
const divNum = divBy(findSum, ...input); // Spread the array values

// the purpose of this script is to execute different functions on an array of 3 integers// 
const input = [6, 25, 11];
const findSum = input.reduce((acc, num) => acc + num, 0);
console.log(findSum);

// each function has been assigned parameters to execute //
const subsFrom = (num1, num2, num3) => num1 - num2 - num3;
const subNum = subsFrom(...input);
console.log(subNum);
// then call the function and display the answer //

const multiBy = (num1, num2, num3) => num1 * num2 * num3;
const multiNum = multiBy(...input)
console.log(multiNum);

const divBy = (findSum, num1, num2, num3) => findSum / num1 / num2 / num3;
const divNum = divBy(findSum, ...input);
console.log(divNum);