My function returns NaN and I don´t know why

Question

I have written this code as an exercise. It is suppost to add up the amount paid for gas and food (stored in the arrays). Sadly I dont know why it returns NaN.

 const gas = [20, 40, 100]; const food = [10, 40, 50]; function total(gas, food) { let gasTotal; let foodTotal; for (i = 0; i < gas.length; i++) { gasTotal += gas[i]; } for (i = 0; i < food.length; i++) { foodTotal += food[i]; } const paidtotal = gasTotal + foodTotal; console.log(paidtotal); } total(gas, food);

Answer 1

You're trying to sum numbers with undefined.

let gasTotal = 0;
let foodTotal = 0;

Initializing as numbers will fix it