I tried to use if else if and else method.

However, it’s showing 5 instead of 20.
May I know why?

Now I used switch method, but I got Error

Your first screen returns the wrong result because you use the assignment operator rather than the comparison operator:

if( quality = 'bad' )

That condition is always true because you assign the value ‘bad’ to quality.
That needs to be

if( quality === 'bad' )

Your 2nd code looks ok. The error message looks like it was thrown before you changed the code. In the error message there is still a space between the first argument and the comma which in your code in the left window is gone.

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