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Pomodoro Timer ⏱️

Intermediate

155 XP

65 min

Lesson Content

Pomodoro Timer ⏱️

Build a productivity timer that helps you focus. This uses setInterval and time management!

Timer Logic

let timeLeft = 25 * 60; // 25 minutes in seconds
let isRunning = false;
let intervalId = null;

function startTimer() {
  if (!isRunning) {
    isRunning = true;
    intervalId = setInterval(() => {
      timeLeft--;
      if (timeLeft <= 0) {
        stopTimer();
        alert('Time is up!');
      }
      updateDisplay();
    }, 1000);
  }
}

function stopTimer() {
  clearInterval(intervalId);
  isRunning = false;
}

Example Code

Create a countdown timer

let timeLeft = 5; // 5 seconds for testing
let intervalId = null;

function startTimer() {
  intervalId = setInterval(() => {
    timeLeft--;
    console.log('Time left:', timeLeft);
    if (timeLeft <= 0) {
      clearInterval(intervalId);
      console.log('Timer finished!');
    }
  }, 1000);
}

function resetTimer() {
  clearInterval(intervalId);
  timeLeft = 5;
}

startTimer();

Expected Output:

Countdown from 5 to 0

Study Tips

•Read the theory content thoroughly before practicing
•Review the example code to understand key concepts
•Proceed to the Practice tab when you're ready to code