Question

How to find of all the prime numbers in an array with JavaScript

Answer 1

function isPrime(n) { 
    if (n === 0) return 0;
    if (n === 1) return 0;
    for (var i = 2; i <= Math.sqrt(n); i++) {
        if (n % i === 0)
            return 0;
    }
    return 1;
}


var arr = [4, 8, 17, 5, 9, 22, 21, 13, 18, 99];
 
for (var i = 0; i < arr.length; i++) {
      if (isPrime(arr[i])) {
          document.write(arr[i] + " ");
      }
}       



/*

17 5 13 
 
*/

 

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