Coding Challenge #66: JavaScript Countdown Timer

In this video, I use the p5.js library to create a web-based countdown timer. I discuss the native JavaScript method setInterval() and well as p5’s millis(). Code: https://thecodingtrain.com/challenges... 🕹️ p5.js Web Editor Sketch: https://editor.p5js.org/codingtrain/s... 🎥 Previous video:    • Coding Challenge #65.1: Binary Search Tree   🎥 Next video:    • Can I code Pong?   🎥 All videos:    • Coding Challenges   References: 🔗 millis() reference: https://p5js.org/reference/#/p5/millis 🔗 getURLParams() reference: https://p5js.org/reference/#/p5/getUR... 🔴 Coding Train Live 87:    • Coding Train Live 87: Timer in JavaScript,...   Related Coding Challenges: 🚂 #74 Clock:    • Coding Challenge #74: Clock with p5.js   Timestamps: 0:00 Introduction 0:52 Describe challenge 1:56 Let's code 2:12 Display timer 3:50 Decide what to display 4:12 Introduce setInterval 5:10 Mention requestAnimationFrame 5:30 Increment counter with setInterval 6:15 Count backwards 7:38 Choose to display minutes and seconds 8:08 Calculate minutes with floor 9:10 Calculate seconds with modulo 10:04 Display minutes and seconds 10:45 Format values with nf 11:50 Describe URL query parameters 12:34 Get parameters with getURLparams 13:40 Handle missing parameter 14:43 Handle minute parameter 15:18 Add sound 16:22 Stop timer 16:58 Stop interval with clearInterval 17:18 Test timer 17:40 Conclusion and creative possibilities 18:10 Addendum: refine timer with millis 18:58 Replace counter with current time 19:49 Debugging 20:45 Conclusion Editing by Mathieu Blanchette Animations by Jason Heglund Music from Epidemic Sound 🚂 Website: http://thecodingtrain.com/ 👾 Share Your Creation! https://thecodingtrain.com/guides/pas... 🚩 Suggest Topics: https://github.com/CodingTrain/Sugges... 💡 GitHub: https://github.com/CodingTrain 💬 Discord: https://thecodingtrain.com/discord 💖 Membership: http://youtube.com/thecodingtrain/join 🛒 Store: https://standard.tv/codingtrain 🖋️ Twitter:   / thecodingtrain   📸 Instagram:   / the.coding.train   🎥 Coding Challenges:    • Coding Challenges   🎥 Intro to Programming:    • Start learning here!   🔗 p5.js: https://p5js.org 🔗 p5.js Web Editor: https://editor.p5js.org/ 🔗 Processing: https://processing.org 📄 Code of Conduct: https://github.com/CodingTrain/Code-o... This description was auto-generated. If you see a problem, please open an issue: https://github.com/CodingTrain/thecod... #countdowntimer #setinterval #p5js #javascript