For such a short string is not something to bother about, and it feels cleaner for this specific problem

exactly my thoughts!

Very impactful.

Its an intuitive idea and makes sense but no, I ran your code vs the code above in a speed checker, with the worst case senario, where every test was more than 5 likes but less than 200, the speed for both over 10 billion iterations is about 1.2 - 1.3 billion operations per second, so both run about the same speed, it seems to be so marginal that its up to your prefrence which to use.

He is already accounting for an empty array with Case 0, so what does that line 2 add?

yup but if he use break like my solution it will be more faster

Switch is not best practice. It looks prettier sure, but its actually slower than a simple if statement. Not by a lot though.

developer choice, but its not needed and will be omitted