format-time.js committed

Author: carlosyabreu

Sprint-2/5-stretch-extend/format-time.js

@@ -23,3 +23,114 @@ console.assert(
   currentOutput2 === targetOutput2,
   `current output: ${currentOutput2}, target output: ${targetOutput2}`
 );
+
+// Test suite for formatAs12HourClock function
+
+function runTests() {
+  const testCases = [
+    // Edge cases and boundaries
+    { input: "00:00", expected: "12:00 am", description: "Midnight" },
+    { input: "12:00", expected: "12:00 pm", description: "Noon" },
+    { input: "00:01", expected: "12:01 am", description: "Just after midnight" },
+    { input: "11:59", expected: "11:59 am", description: "Just before noon" },
+    { input: "12:01", expected: "12:01 pm", description: "Just after noon" },
+    { input: "23:59", expected: "11:59 pm", description: "Just before midnight" },
+
+    // AM hours
+    { input: "01:00", expected: "01:00 am", description: "1 AM" },
+    { input: "02:30", expected: "02:30 am", description: "2:30 AM" },
+    { input: "09:15", expected: "09:15 am", description: "9:15 AM" },
+    { input: "11:45", expected: "11:45 am", description: "11:45 AM" },
+
+    // PM hours
+    { input: "13:00", expected: "01:00 pm", description: "1 PM" },
+    { input: "14:30", expected: "02:30 pm", description: "2:30 PM" },
+    { input: "17:45", expected: "05:45 pm", description: "5:45 PM" },
+    { input: "22:15", expected: "10:15 pm", description: "10:15 PM" },
+
+    // Invalid inputs
+    { input: "24:00", expected: "12:00 am", description: "24:00 (should be midnight)" },
+    { input: "25:00", expected: null, description: "Invalid hour > 24" },
+    { input: "12:60", expected: null, description: "Invalid minutes > 59" },
+    { input: "9:00", expected: null, description: "Missing leading zero" },
+    { input: "09-00", expected: null, description: "Wrong separator" },
+    { input: "abc", expected: null, description: "Non-numeric input" },
+    { input: "", expected: null, description: "Empty string" },
+    { input: "12", expected: null, description: "Incomplete time" },
+    { input: "12345", expected: null, description: "Too many digits" },
+  ];
+
+  console.log("Running tests for formatAs12HourClock...\n");
+
+  let passed = 0;
+  let failed = 0;
+
+  testCases.forEach((testCase, index) => {
+    try {
+      const result = formatAs12HourClock(testCase.input);
+      const passed_test = result === testCase.expected;
+
+      if (passed_test) {
+        console.log(`Test ${index + 1}: ${testCase.description} - PASSED`);
+        passed++;
+      } else {
+        console.log(`Test ${index + 1}: ${testCase.description} - FAILED`);
+        console.log(`Input: "${testCase.input}"`);
+        console.log(`Expected: "${testCase.expected}"`);
+        console.log(`Got: "${result}"\n`);
+        failed++;
+      }
+    } catch (error) {
+      console.log(`Test ${index + 1}: ${testCase.description} - ERROR`);
+      console.log(`Input: "${testCase.input}"`);
+      console.log(`Error: ${error.message}\n`);
+      failed++;
+    }
+  });
+
+  console.log(`\nTests completed: ${passed} passed, ${failed} failed`);
+}
+
+// Run the tests
+runTests();
+
+// Fixed Code:
+
+function formatAs12HourClock(time) {
+  // Input validation
+  if (typeof time !== 'string' || !time) {
+    return null;
+  }
+
+  // Check format: HH:MM with leading zeros
+  const timeRegex = /^([0-1][0-9]|2[0-3]):([0-5][0-9])$/;
+  if (!timeRegex.test(time)) {
+    return null;
+  }
+
+  const hours = Number(time.slice(0, 2));
+  const minutes = time.slice(3, 5);
+
+  // Handle midnight (00:00)
+  if (hours === 0) {
+    return `12:${minutes} am`;
+  }
+
+  // Handle noon (12:00) and other PM hours
+  if (hours === 12) {
+    return `12:${minutes} pm`;
+  }
+
+  if (hours > 12) {
+    const pmHours = hours - 12;
+    // Add leading zero for hours 1-9
+    const formattedHours = pmHours < 10 ? `0${pmHours}` : `${pmHours}`;
+    return `${formattedHours}:${minutes} pm`;
+  }
+
+  // AM hours (1-11)
+  // Keep leading zero for hours 1-9
+  const formattedHours = hours < 10 ? `0${hours}` : `${hours}`;
+  return `${formattedHours}:${minutes} am`;
+}
+