Beginner's Guide to Troubleshooting in JavaScript
Jun 1, 2020 — 1 min read
This guide will help you understand how to debug code and know the 2 most common types of errors.
Types of Errors
1. Syntax Errors - Spelling/capitalization errors in code
2. Logic Errors - Program runs but result is incorrect
Example: Syntax error
The console will show ReferenceError, TypeError, or NullError for syntax errors.
Types of Syntax Errors
Usually stated as:
- ReferenceError
- TypeError
- NullError
Read your code line-by-line to find them.
Example: Logic error
Logic errors don't show in console but the output is wrong. For example:
// Wrong - uses = instead of ==
if(word = "apple") { return true; }
// Correct
if(word == "apple") { return true; }
Types of Logic Errors
Logic errors are invisible to the console. Take your time to break down your code and understand its logic.
Conclusion
Use the Inspector window (F12) to debug code in your browser. Practice makes perfect with troubleshooting! Thanks for reading!
