diff --git a/Sprint-3/alarmclock/alarmclock.js b/Sprint-3/alarmclock/alarmclock.js
index 6ca81cd3b..6af1dce59 100644
--- a/Sprint-3/alarmclock/alarmclock.js
+++ b/Sprint-3/alarmclock/alarmclock.js
@@ -1,4 +1,83 @@
-function setAlarm() {}
+//Given the user has entered a number in the input field
+//When the user clicks the "Set Alarm" button
+//Then the "Time Remaining" title should update to show the entered number in mm:ss format
+
+//Given the alarm is set with a valid time
+//When one second passes
+//Then the "Time Remaining" title should decrement by 1 second
+
+//Given the alarm is set with a time of 00:00
+//When the timer reaches 00:00
+//Then the alarm sound should play continuously
+
+//Given the alarm sound is currently playing
+//When the user clicks the "Stop Alarm" button
+//Then the alarm sound should stop playing
+
+//Given the alarm is set with a time of 00:10
+//When the timer reaches 00:00
+//Then the background colour should change
+//And the alarm sound should play
+
+//Given the user has not set an alarm
+//When the page first loads
+//Then the "Time Remaining" title should show 00:00
+// And no alarm sound should play
+
+// 1. create variable that holds time entered by user
+// 2. create a variable we are counting to
+// 3. convert time to minutes and seconds and store it
+// in variable
+// 4. display the time in the "Time Remaining" title.
+// when "Set alarm" button is clicked.
+// 5. decrement the time by 1 second every second
+// 6. trigger the alarm sound when the time reaches 00:00
+let remainingSeconds = 0;
+let minutes = 0;
+let seconds = 0;
+let paddedMinutes = 0;
+let paddedSeconds = 0;
+let timer;
+const alarmDisplay = document.getElementById("timeRemaining");
+function formatTime() {
+ //this function will separate minutes and seconds and add zeros
+ // if minutes or seconds are in single digits.
+ minutes = Math.floor(remainingSeconds / 60);
+ paddedMinutes = minutes.toString().padStart(2, "0");
+ seconds = remainingSeconds % 60;
+ paddedSeconds = seconds.toString().padStart(2, "0");
+}
+function setAlarm() {
+ //1.this function clears the timer for the first use
+ //2. gets the entered number and stores in in the variable
+ //3. checks for invalid input
+ //4. displays the initial timer in minutes and seconds
+ //5. starts timer
+ clearInterval(timer);
+ remainingSeconds = Number(document.getElementById("alarmSet").value);
+ if (remainingSeconds === 0) {
+ return pauseAlarm();
+ } else if (remainingSeconds < 0) {
+ return clearInterval(timer);
+ }
+ formatTime();
+ alarmDisplay.textContent = `Time Remaining: ${paddedMinutes}:${paddedSeconds}`;
+ timer = setInterval(updateDisplay, 1000);
+}
+
+function updateDisplay() {
+ //this function:
+ //1. when timer reaches zero it stops the timer.
+ //2. it then sounds alarm
+ //3. otherwise it decrements the timer and displays the result.
+ if (remainingSeconds === 0) {
+ clearInterval(timer);
+ return playAlarm();
+ }
+ remainingSeconds = remainingSeconds - 1;
+ formatTime();
+ alarmDisplay.textContent = `Time Remaining: ${paddedMinutes}:${paddedSeconds}`;
+}
// DO NOT EDIT BELOW HERE
diff --git a/Sprint-3/alarmclock/index.html b/Sprint-3/alarmclock/index.html
index 48e2e80d9..b0b194d0d 100644
--- a/Sprint-3/alarmclock/index.html
+++ b/Sprint-3/alarmclock/index.html
@@ -4,7 +4,8 @@
- Title here
+
+ Alarm clock app