Done

index.js

@@ -0,0 +1,30 @@
+function shout(string) {
+  return string.toUpperCase();
+}
+
+function whisper(string) {
+  return string.toLowerCase();
+}
+
+function logShout(string) {
+  return console.log(string.toUpperCase());
+}
+
+function logWhisper(string) {
+ return console.log(string.toLowerCase());
+}
+
+function sayHiToGrandma(string) {
+  var uppercase = "HELLO!";
+  var lowercase = "hello!";
+  var mixedCase = "Hi there!";
+  if (string === string.toUpperCase()) {
+    return 'YES INDEED!';
+  } else if (string === string.toLowerCase()) {
+    return "I can't hear you!"; 
+  } else if (string === 'I love you, Grandma.') {
+    return "I love you, too.";
+  }
+}
+
+console.log(sayHiToGrandma("HELLO!"));