Step 12. Errors

Errors while writing programs are normal. The important thing is to understand where the error is.

1. The editor warns you about errors using an X icon on the left-hand side. Hover on it for info.
2. When you save the file, you will be warned again in the pop-up.
3. Some errors cannot be detected in the editor and you will only find out when you run the program.
4. Errors found when the program is run are displayed in the JavaScript console. To see the console, press Ctrl-Shift-J on Chrome and Firefox, or F12 on Edge and IE.