Solved Chronometer Lab

src/chronometer-centiseconds.js

@@ -1,37 +1,57 @@
+/ src/chronometer-centiseconds.js
+
 class Chronometer {
   constructor() {
-    // ... your code goes here
+    this.currentTime = 0; // centiseconds elapsed
+    this.intervalId = null;
   }
 
+  // Start the timer, counting centiseconds
   start(printTimeCallback) {
-    // ... your code goes here
+    this.intervalId = setInterval(() => {
+      this.currentTime++; // increment by 1 centisecond (10ms)
+      if (printTimeCallback) printTimeCallback();
+    }, 10); // 10ms = 1 centisecond
   }
 
+  // Return full minutes
   getMinutes() {
-    // ... your code goes here
+    return Math.floor(this.currentTime / 6000); // 6000 centiseconds = 1 minute
   }
 
+  // Return seconds in the current minute
   getSeconds() {
-    // ... your code goes here
+    return Math.floor((this.currentTime % 6000) / 100); // remaining full seconds
   }
 
+  // Return centiseconds in the current second
   getCentiseconds() {
-    // ... your code goes here
+    return this.currentTime % 100;
   }
 
+  // Format any number as two digits (e.g., 7 => "07")
   computeTwoDigitNumber(value) {
-    // ... your code goes here
+    return value < 10 ? `0${value}` : `${value}`;
   }
 
+  // Stop the timer
   stop() {
-    // ... your code goes here
+    clearInterval(this.intervalId);
   }
 
+  // Reset the timer to 0
   reset() {
-    // ... your code goes here
+    this.currentTime = 0;
   }
 
+  // Return formatted time "mm:ss:cs"
   split() {
-    // ... your code goes here
+    const minutes = this.computeTwoDigitNumber(this.getMinutes());
+    const seconds = this.computeTwoDigitNumber(this.getSeconds());
+    const centiseconds = this.computeTwoDigitNumber(this.getCentiseconds());
+    return `${minutes}:${seconds}:${centiseconds}`;
   }
 }
+
+// If using modules, uncomment the following line
+// module.exports = Chronometer;

src/chronometer.js

@@ -1,33 +1,48 @@
 class Chronometer {
   constructor() {
-    // ... your code goes here
+    this.currentTime = 0; // centiseconds elapsed
+    this.intervalId = null;
   }
 
+  // Start the timer, counting centiseconds
   start(printTimeCallback) {
-    // ... your code goes here
+    this.intervalId = setInterval(() => {
+      this.currentTime++; // increment by 1 centisecond (10ms)
+      if (printTimeCallback) printTimeCallback();
+    }, 10); // 10ms = 1 centisecond
   }
 
   getMinutes() {
-    // ... your code goes here
+    return Math.floor(this.currentTime / 6000); // 6000 centiseconds = 1 minute
   }
 
   getSeconds() {
-    // ... your code goes here
+    return Math.floor((this.currentTime % 6000) / 100); // remaining full seconds
+  }
+
+  getCentiseconds() {
+    return this.currentTime % 100; // remaining centiseconds in current second
   }
 
   computeTwoDigitNumber(value) {
-    // ... your code goes here
+    return value < 10 ? `0${value}` : `${value}`;
   }
 
   stop() {
-    // ... your code goes here
+    clearInterval(this.intervalId);
   }
 
   reset() {
-    // ... your code goes here
+    this.currentTime = 0;
   }
 
   split() {
-    // ... your code goes here
+    const minutes = this.computeTwoDigitNumber(this.getMinutes());
+    const seconds = this.computeTwoDigitNumber(this.getSeconds());
+    const centiseconds = this.computeTwoDigitNumber(this.getCentiseconds());
+    return `${minutes}:${seconds}:${centiseconds}`;
   }
 }
+
+// If using modules, uncomment this line:
+// module.exports = Chronometer;