๐๐ฒ๐๐๐ผ๐ป๐ ๐๐ฟ๐ผ๐บ ๐ฎ ๐๐ฎ๐น๐ผ๐ฟ๐ถ๐ฒ ๐๐ผ๐๐ป๐๐ฒ๐ฟ ๐ฃ๐ฟ๐ผ๐ท๐ฒ๐ฐ๐
I thought a calorie counter was a simple math project. I was wrong. It taught me about input handling.
Users type weird things. They add plus signs or spaces. These strings break your app. I used regex to clean the noise.
Browsers allow scientific notation. A user might type 1e10. This adds ten billion calories to breakfast. Stop this with a second check.
I used a boolean flag for errors. You have other options:
- Return null.
- Throw an error.
- Return a status object. Each choice changes who handles the mistake.
You do not need a framework for dynamic forms. Use insertAdjacentHTML. Match your IDs and labels. This keeps your forms working.
Valid input is not the same as correct input. Close the gap between browser acceptance and safe math.