adding Callback example

LectureCodeExamples/Week2/Callback.js

+function printName(name, cb) {
+    console.log("inside printName function")
+    console.log(name)
+    cb(name)
+}
+
+function printReverseName(name) {
+    console.log(name.split("").reverse().join(""))
+}
+
+function reverseString(str) {
+    return str.split("").reverse().join("")
+}
+printName("Nikola", printReverseName)
+
+let sports = ["rowing", "cycling", "tennis", "padel", "soccer"]
+
+let newSports = sports.map(sport => {
+    console.log("this is a multi-line arrow function")
+    return reverseString(sport)
+})
+
+console.log(sports)
+console.log(newSports)
\ No newline at end of file