Min Factor Distance

min-factor-distance/index.js

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+// https://www.codewars.com/kata/min-factor-distance/train/javascript
+
+function minDistance(n){
+  let f = factors(n);
+  f.unshift(1);
+  let min = Infinity;
+  for (let i = 1; i < f.length; ++i) {
+    let diff = f[i] - f[i-1];
+    if (0 < diff) {
+      min = Math.min(min, diff);
+    }
+  }
+  return min;
+}
+
+function factors(n) {
+  let max = Math.floor(Math.sqrt(n));
+  let res = [];
+  for (let i = 2; i <= max; ++i) {
+    if (n % i === 0) {
+      res.push(i);
+      n /= i;
+      max = Math.floor(Math.sqrt(n));
+      i = (Math.min(...res) || 2) - 1;
+    }
+  }
+  res.push(n);
+  return res;
+}