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Michael Zeltner128 Points
"Undefined" in Console
Why is there "undefined" logged into the the console and how can you prevent this?
Steven Parker228,978 Points
If you're just firing off functions from the console, it is normal for the console to show you the return value (or "undefined" if there isn't any) as Evans observed.
You can prevent this by adding a return statement to any function you plan on using this way. If the function has no other reason to return a value, you could do something specifically for the console such as returning a string with the function name followed by the word "done".