new files

Task/Search-a-list/JavaScript/search-a-list-2.js

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+for each (var needle in needles) {
+    var idx = haystack.indexOf(needle);
+    if (idx == -1)
+        throw needle + " does not appear in the haystack"
+    else
+        print(needle + " appears at index " + idx + " in the haystack");
+}
+
+// extra credit
+
+for each (var elem in haystack) {
+    var first_idx = haystack.indexOf(elem);
+    var last_idx  = haystack.lastIndexOf(elem);
+    if (last_idx > first_idx) {
+        print(elem + " last appears at index " + last_idx + " in the haystack");
+        break
+    }
+}