Done

index.js

@@ -0,0 +1,26 @@
+function takeANumber(katzDeliLine,newCustomer) {
+  katzDeliLine.push(newCustomer);
+  var spotInLine = katzDeliLine.indexOf(newCustomer);
+  spotInLine++;
+  var greeting = "Welcome, " + newCustomer + ". You are number " + spotInLine + " in line.";
+  return greeting;
+}
+
+function nowServing(katzDeliLine) {
+  var firstCustomer = katzDeliLine.shift();
+  var str = "Currently serving " + firstCustomer + ".";
+  var result = firstCustomer ? str : "There is nobody waiting to be served!";
+  return result;
+}
+
+function currentLine(katzDeliLine) {
+  var str = "The line is currently: ";
+  var customerList = [];
+
+  for (let i = 0; i < katzDeliLine.length; i++) {
+    customerList.push((i + 1) + ". " + katzDeliLine[i]);
+  }
+  var resultStr = "The line is currently: " + customerList.join(", ");
+  var result = (katzDeliLine.length > 0) ? resultStr : "The line is currently empty.";
+  return result;
+}