interview question - write a program to remember the sum of previous value

function getSumFn(){

 var prevSum = 0;

 return function sum(value){

  prevSum = prevSum + value;

  return prevSum;

 }

}

const sum = getSumFn();

console.log(sum(1));

console.log(sum(5));

console.log(sum(9));

console.log(sum(10));