CodeYourFuture · Baba05206 · Nov 6, 2025 · Nov 7, 2025 · Nov 18, 2025 · Nov 28, 2025
diff --git a/Sprint-3/alarmclock/alarmclock.js b/Sprint-3/alarmclock/alarmclock.js
@@ -1,4 +1,55 @@
-function setAlarm() {}
+// Constants for time conversion
+const SECONDS_PER_MINUTE = 60;
+const MILLISECONDS_PER_SECOND = 1000;
+
+let intervalId;
+
+/**
+ * Formats time in seconds to MM:SS format
+ * @param {number} totalSeconds - The time in seconds to format
+ * @returns {string} Formatted time string in "Time Remaining: MM:SS" format
+ */
+function formatTimeDisplay(totalSeconds) {
+  const minutes = Math.floor(totalSeconds / SECONDS_PER_MINUTE);
+  const seconds = totalSeconds % SECONDS_PER_MINUTE;
+
+  return (
+    "Time Remaining: " +
+    String(minutes).padStart(2, "0") +
+    ":" +
+    String(seconds).padStart(2, "0")
+  );
+}
+
+function setAlarm() {
+  const input = document.getElementById("alarmSet");
+  const heading = document.getElementById("timeRemaining");
+
+  let totalSeconds = Number(input.value);
+
+  // Input validation: check for invalid or non-positive numbers
+  if (isNaN(totalSeconds) || totalSeconds <= 0) {
+    heading.innerText = "Please enter a valid positive number of seconds";
+    return;
+  }
+
+  clearInterval(intervalId);
+
+  heading.innerText = formatTimeDisplay(totalSeconds);
+
+  intervalId = setInterval(() => {
+    totalSeconds--;
+
+    if (totalSeconds <= 0) {
+      heading.innerText = formatTimeDisplay(0);
+      clearInterval(intervalId);
+      playAlarm();
+      return;
+    }
+
+    heading.innerText = formatTimeDisplay(totalSeconds);
+  }, MILLISECONDS_PER_SECOND);
+}
 
 // DO NOT EDIT BELOW HERE
 

diff --git a/Sprint-3/alarmclock/index.html b/Sprint-3/alarmclock/index.html
@@ -4,7 +4,7 @@
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <link rel="stylesheet" href="style.css" />
-    <title>Title here</title>
+    <title>Alarm clock app</title>
   </head>
   <body>
     <div class="centre">

diff --git a/Sprint-3/package.json b/Sprint-3/package.json
@@ -26,7 +26,7 @@
     "@testing-library/dom": "^10.4.0",
     "@testing-library/jest-dom": "^6.6.3",
     "@testing-library/user-event": "^14.6.1",
-    "jest": "^30.0.4",
+    "jest": "^30.2.0",
     "jest-environment-jsdom": "^30.0.4"
   }
 }