// https://projecteuler.net/problem=10 const isPrime = (number) => { let flag = true for (let j = number - 1; j >= 2; j--) { if (number % j === 0) { flag = false } } return flag } const calculateSumOfPrimeNumbers = (maxNumber) => { let sum = 0 for (let i = maxNumber - 1; i >= 2; i--) { if (isPrime(i) === true) { sum += i } } return sum } export { calculateSumOfPrimeNumbers }