ideas for improvement

[ghost]

I took a look at the source code and found some places to improve it and therefore increase efficiency and reduce runtime. BTW: Why is the content of the complete main.js file shifted to the right?

gcd:

• to parse the arguments into integers and to check if both numbers are NaN or negative is only necessary once, at the beginning
• instead of checking for negative number or zero simply use Math.abs
  --> outsourcing the actual implementation of the Euclidean algorithm
  --> BETTER: use imperative implementation instead of recursive
• Code:

function gcd (m, n) {
  m = Math.abs(parseInt(m, 10));
  n = Math.abs(parseInt(n, 10));

  // NaN
  if (isNaN(m) || isNaN(n)) {
    throw new Error("Invalid arguments.");  
  }

  // Euclidean algorithm
  while (n != 0) {
    let t = n;
    n = m % n;
    m = t;
  }

  return m;
}

• improved readability
• should reduce runtime

gcdExtended:

• see gcd

factorize:

• avoid loop without break-condition to avoid mistakes and infinite loops
  --> use m * m <= n as loop-break-condition
  --> add factors.push(n); return factors; at end

Hope i could help.