Update 50-powx-n.js

Author: everthis

50-powx-n.js

@@ -17,6 +17,23 @@ const myPow = function(x, n) {
 
 // another
 
+/**
+ * @param {number} x
+ * @param {number} n
+ * @return {number}
+ */
+const myPow = function(x, n) {
+  if(n === 0) return 1
+  if(n === 1) return x
+  if(n < 0) {
+    x = 1 / x
+    n = -n
+  }
+  return n % 2 === 1 ? myPow(x, ~~(n / 2)) ** 2 * x : myPow(x, ~~(n / 2)) ** 2
+};
+
+// another
+
 /**
  * @param {number} x
  * @param {number} n