尝试在数组中查找素数

Question

我想从数组中删除非质数，下面只删除偶数，而不是质数。

function sumPrimes(num) {
  //Produce an array containing all number of to and including num
  let numArray = [];
  for (let i = 1; i <= num; i++) {
    numArray.push(i);
  }

  //Remove non-prime numbers from the array     
  numArray.map((number) => {
    for (let i = 2; i < number; i++) {
        if(number % i === 0) {
            let index = numArray.indexOf(number);
            return numArray.splice(index, 1);       
        }
    }   
  });

 return numArray;

}

sumPrimes(10);

这当前正在返回：

[1, 2, 3, 5, 7, 9]

但是，素数是1，2，3，5，7(不包括9)；