JavaScript Function keeps returning undefined after showing the output

Question

The code answers true or false but after it keeps saying undefined eg trueundefined. What could i have done wrong?

function gamble(){
   let prob = parseInt(prompt('Enter a number'));
   let prize = parseInt(prompt('Enter a number'));
 let pay = parseInt(prompt('Enter a number'));
  let probPrize = prob * prize;
if (probPrize > pay){
  document.write('True');

}else{
  document.write('False');
}

};

document.write(gamble());

Answer 1

You're not returning anything from the function, so it's undefined.

Replace document.write('True') with return 'True' and document.write('False') with return 'False'

Answer 2

because your function gamble doesn't return any value

replace your code to this :

function gamble(){
   let prob = parseInt(prompt('Enter a number'));
   let prize = parseInt(prompt('Enter a number'));
   let pay = parseInt(prompt('Enter a number'));
   let probPrize = prob * prize;
   if (probPrize > pay){
    return 'True';
   }else{
    return 'False';
   }
};
document.write(gamble());