all test passed -debbuged

.vscode/launch.json

@@ -0,0 +1,24 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+
+
+        {
+            "type": "node",
+            "request": "launch",
+            "name": "Mocha Tests",
+            "program": "${workspaceFolder}/node_modules/mocha/bin/_mocha",
+            "args": [
+                "${workspaceFolder}/tests.js"
+            ],
+            "internalConsoleOptions": "openOnSessionStart",
+            "skipFiles": [
+                "<node_internals>/**",
+                "${workspaceFolder}/node_modules/**/*"
+            ]
+        }
+    ]
+}

index.js

@@ -1,6 +1,6 @@
 function stringIncludes(haystack, needle) {
   for (let i = 0; i < haystack.length; i++) {
-    if (haystack.slice(i, needle.length) === needle) {
+    if (haystack.slice(i, i + needle.length) === needle) {
       return true
     }
   }
@@ -10,13 +10,12 @@ function stringIncludes(haystack, needle) {
 
 function countLetter(haystack, needle) {
   let count = 0
+  for (let i = 0; i < haystack.length; i++) {
+    if (haystack.slice(i, i + needle.length) === needle) {
 
-  while (haystack.length) {
-    if (haystack.shift() === needle) {
       count++
     }
   }
-
   return count
 }
 
@@ -39,4 +38,5 @@ module.exports = {
   stringIncludes,
   countLetter,
   camelCase,
+
 }