freeCodeCamp/curriculum/challenges/english/99-dev-playground/daily-coding-challenges-javascript/javascript-challenge-13.md

id, title, challengeType, dashedName

id	title	challengeType	dashedName
6821ebc9237de8297eaee78f	JavaScript Challenge 13: Unnatural Prime	28	javascript-challenge-13

--description--

Given an integer, determine if that number is a prime number or a negative prime number.

• A prime number is a positive integer greater than 1 that is only divisible by 1 and itself.
• A negative prime number is the negative version of a positive prime number.
• 1 and 0 are not considered prime numbers.

--hints--

isUnnaturalPrime(1) should return false.

assert.isFalse(isUnnaturalPrime(1));

isUnnaturalPrime(-1) should return false.

assert.isFalse(isUnnaturalPrime(-1));

isUnnaturalPrime(19) should return true.

assert.isTrue(isUnnaturalPrime(19));

isUnnaturalPrime(-23) should return true.

assert.isTrue(isUnnaturalPrime(-23));

isUnnaturalPrime(0) should return false.

assert.isFalse(isUnnaturalPrime(0));

isUnnaturalPrime(97) should return true.

assert.isTrue(isUnnaturalPrime(97));

isUnnaturalPrime(-61) should return true.

assert.isTrue(isUnnaturalPrime(-61));

isUnnaturalPrime(99) should return false.

assert.isFalse(isUnnaturalPrime(99));

isUnnaturalPrime(-44) should return false.

assert.isFalse(isUnnaturalPrime(-44));

--seed--

--seed-contents--

function isUnnaturalPrime(n) {

  return n;
}

--solutions--

function isUnnaturalPrime(n) {
  const abs = Math.abs(n);

  if (abs <= 1) return false;

  for (let i = 2; i <= Math.sqrt(abs); i++) {
    if (abs % i === 0) return false;
  }

  return true;
}