solve excersise repeat-str.js

Author: AbdennourHachemi

practice-tdd/repeat-str.js

@@ -1,5 +1,14 @@
-export function repeatStr() {
+export function repeatStr(str, count) {
   // Your implementation of this function must *not* call String.prototype.repeat (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeat).
   // The goal is to re-implement that function, not to use it.
-  return "hellohellohello";
+  if (count < 0) {
+    return "Error! negative counts are not valid";
+  }
+  let result = "";
+  let counter = count;
+  while (counter > 0) {
+    result += str;
+    counter--;
+  }
+  return result;
 }