JavaScript: Compute the factors of a positive integer

Last update on May 30 2022 10:08:01 (UTC/GMT +8 hours)

JavaScript Function: Exercise-13 with Solution

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

Sample Solution: -

HTML Code:

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

JavaScript Code:

function factors(n)
{
 var num_factors = [], i;
 
 for (i = 1; i <= Math.floor(Math.sqrt(n)); i += 1)
  if (n % i === 0)
  {
   num_factors.push(i);
   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:

[1,3,5,15]
[1,2,4,8,16]
[1,17]

Flowchart:

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

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = [];
arr[0] = "Jani";
arr[1] = "Hege";
arr[2] = "Stale";
arr[3] = "Kai Jim";
arr[4] = "Borge";

console.log(arr.join());
arr.splice(2, 0, "Lene");
console.log(arr.join());

Ref: https://bit.ly/2BXbp04