I have a question. Why is 'undefined coming out?'

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#1
// Write your function here: const finalGrade = (a,b,c)=> { let average = (a+b+c)/3; if ((a>100 || a < 0) ||(b>100 || b < 0)||(c>100 || c< 0)) return 'You have entered an invalid grade.'; switch (average){ case (0 <= average) && (average <= 60) : return 'F'; break; case (60 <= average) && (average <= 70) : return 'D'; break; case (70 <= average) && (average <= 80) : return 'C'; break; case (80 <= average) && (average <= 90) : return 'B'; break; case (90 <= average) && (average <= 100) : return 'A'; break; } } console.log(finalGrade(99, 92, 95)) // Should print 'A' // We encourage you to add more function calls of your own to test your code!

Why is ‘undefined’ coming out as an output?

#2

that means no return keyword is reached, and thus you get undefined

you can’t use switch like that. Switch does equality (===) comparison with the cases

if you really want to use switch, you should do switch(true)

#3

Why can’t I use switch this way?
Thnx for the reply btw

#4

I covered this:

switch is useful when you have specific values, not when you have ranges like you have

#5

I got it. Thank you :slight_smile: