JavaScript: Compute the factors of a positive integer

JavaScript Function: Exercise-13 with Solution

Write a JavaScript function to compute the factors of a positive integer.

Sample Solution: -

HTML Code:

<!DOCTYPE html>
<meta charset=utf-8 />
<title>Compute the factors of a positive integer</title>

JavaScript Code:

function factors(n)
 var num_factors = [], i;
 for (i = 1; i <= Math.floor(Math.sqrt(n)); i += 1)
  if (n % i === 0)
   if (n / i !== i)
    num_factors.push(n / i);
 num_factors.sort(function(x, y)
     return x - y;});  // numeric sort
     return num_factors;
console.log(factors(15));  // [1,3,5,15] 
console.log(factors(16));  // [1,2,4,8,16] 
console.log(factors(17));  // [1,17]

Sample Output:



Flowchart: JavaScript function: Compute the factors of a positive integer

Live Demo:

See the Pen JavaScript - Compute the factors of a positive integers-function-ex- 13 by w3resource (@w3resource) on CodePen.

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JavaScript: Tips of the Day

Shorten an array using its length property

A great way of shortening an array is by redefining its length property.

let array = [0, 1, 2, 3, 4, 5, 6, 6, 8, 9]
array.length = 4
// Result: [0, 1, 2, 3]

Important to know though is that this is a destructive way of changing the array. This means you lose all the other values that used to be in the array.

Ref: https://bit.ly/2LBj213