freeCodeCamp/curriculum/challenges/english/10-coding-interview-prep/rosetta-code/factors-of-an-integer.md

id, title, challengeType, forumTopicId, dashedName

id	title	challengeType	forumTopicId	dashedName
597f1e7fbc206f0e9ba95dc4	Factors of an integer	5	302265	factors-of-an-integer

--description--

Write a function that returns the factors of a positive integer as an array.

These factors are the positive integers by which the number being factored can be divided to yield a positive integer result.

--hints--

factors should be a function.

assert(typeof factors === 'function');

factors(45) should return [1,3,5,9,15,45].

assert.deepEqual(factors(45), ans[0]);

factors(53) should return [1,53].

assert.deepEqual(factors(53), ans[1]);

factors(64) should return [1,2,4,8,16,32,64].

assert.deepEqual(factors(64), ans[2]);

--seed--

--after-user-code--

const ans=[[1,3,5,9,15,45],[1,53],[1,2,4,8,16,32,64]];

--seed-contents--

function factors(num) {

}

--solutions--

function factors(num)
{
 let n_factors = [], i, sqr=Math.floor(Math.sqrt(num));

 for (i = 1; i <=sqr ; i += 1)
  if (num % i === 0)
  {
   n_factors.push(i);
   if (num / i !== i)
    n_factors.push(num / i);
  }
 n_factors.sort(function(a, b){return a - b;});
 return n_factors;
}