How to add leading zero to a number in JavaScript
New Course Coming Soon:
Get Really Good at Git
I had the need to add a leading zero when the number I had was less than 10, so instead of printing “9” on the screen, I had “09”.
The use case being I wanted to display the length of a video, and 5:04
is more logical than 5:4
to say a video is 5 minutes and 4 seconds.
Here’s how I did it:
Math.floor(mynumber)
.toString()
.padStart(2, '0')
All of this is native to JavaScript, using the Math built-in library
Are you intimidated by Git? Can’t figure out merge vs
rebase? Are you afraid of screwing up something any time
you have to do something in Git? Do you rely on ChatGPT
or random people’s answer on StackOverflow to fix your
problems? Your coworkers are tired of explaining Git to
you all the time? Git is something we all need to use,
but few of us really master it. I created this course to
improve your Git (and GitHub) knowledge at a radical
level. A course that helps you feel less frustrated with
Git. Launching Summer 2024. Join the waiting list!
→ Get my
JavaScript Beginner's Handbook
→ Read my
JavaScript Tutorials
on The Valley of Code
→ Read my
TypeScript Tutorial
on The Valley of Code
Here is how can I help you:
- COURSES where I teach everything I know
- THE VALLEY OF CODE your web development manual
- BOOTCAMP 2024 cohort in progress, next edition in 2025
- BOOKS 16 coding ebooks you can download for free on JS Python C PHP and lots more
- SOLO LAB everything I know about running a lifestyle business as a solopreneur
- Interesting links collection
- Follow me on X