How to create a function which multiply the quantity of the product to the cost and add to the total-CodePudding

Let's say I have 10 bottles of water with the price of 0,8cent for each one, I need to find the total cost of 10 bottles so I multiply 10 by 0,8 which makes 8,00$. Next I need to find 18% of 8$ and add it to 8$. I wrote some code but it shows that the result is not a function:

function multyAll(quantity, oneCost) {
 quantity = prompt('Insert quantity')
 oneCost = prompt('Insert the cost')
let mul = quantity * oneCost;
function totalPer() {
    let percent = (mul * 18) / 100
return percent
}
return mul
}
let result = multyAll(12, 0.8)
console.log(result())

CodePudding user response：

I'm not sure why you're trying to reassign your parameters in your function, since they're what's passed to it for your values. Your error message "result is not a function" is because you're console logging result() (the parentheses mean you want to run the function, but result isn't a function, it's the result of a function). I believe this code should solve your problems

function calculatePrice(quantity, unitPrice, taxRate){
    const subtotal = quantity * unitPrice;
    const total = subtotal   (subtotal * taxRate);
    return total;
}

console.log(calculatePrice(10, .8, .18)); // outputs $9.44

This function takes 10 units (bottles of water) and multiplies them by their unit price ($.80), and adds the amount in tax to that result (you said 18%).

CodePudding user response：

you wrote console.log(result()) in last line, should be console.log(result) without parentheses after result. You getting result is not a function because resoult is variable and adding parathesis after it javascript angine wants to invoke it as function.