Tail recursion optimization

Author: tshemsedinov

JavaScript/7-tail.js

@@ -0,0 +1,18 @@
+'use strict';
+
+const add = (n, acc = 0) => {
+  if (n === 0) return acc;
+  return add(n - 1, acc + n);
+};
+
+console.log(add(3));
+
+const tail = (n, acc = 0) => {
+  while (true) {
+    if (n === 0) return acc;
+    acc = acc + n;
+    n = n - 1;
+  }
+};
+
+console.log(tail(3));