JavaScript Challenge #3 | Reverse a Number in JavaScript | Step-by-Step Number Logic Number
In this video, we solve the problem “Reverse a number” using pure JavaScript number logic, without converting the number into a string.
We carefully break down the logic into clear steps and explain what actually happens mathematically when reversing a number. Instead of loosely saying “append digits”, we explain why we shift digits and add the new digit, which is the correct and precise way to think about numbers.
This lesson focuses on accuracy in logic and terminology, helping you build a strong mental model of how numbers work in programming.
What you’ll learn in this video:
How to extract the last digit using % 10
Why multiplying by 10 shifts digits to the left
Why adding a digit is more accurate than saying “append”
How digits are removed using Math.floor(num / 10)
How this logic connects to palindrome and other number problems
This video is part of a JavaScript Number Logic series, where we move from simple problems to more complex ones while explaining every step clearly.
This lesson is especially useful if you want to understand the logic behind the code, not just the syntax.