first occurence of string

Author: problemsolver03

FirstOccurrenceString.js

@@ -0,0 +1,17 @@
+//haystack = "sadbutsad", needle = "sad"
+
+var strStr = function (haystack, needle) {
+  let returnIndex = -1;
+  for (let i = 0; i < haystack.length; i++) {
+    if (haystack[i] === needle[0]) {
+      let match = haystack.substring(i, needle.length + i);
+      if (match === needle) {
+        returnIndex = i;
+        break;
+      }
+    }
+  }
+  return returnIndex;
+};
+
+console.log(strStr("good", "ood"));