Good question. People will say blanket things like "for loops are always faster", but it -really- depends on every individual use case. So you might want to create solutions for each to the best of your ability, then benchmark them.

Here are a couple of the top solutions (one for switch statement, and one for for loops) benchmarked against each other: https://jsbench.me/e3lh84u45z/1

It seems like the switch statement solution is 11% faster, but you'll notice the for loop example has some regex bloat in there which is probably slowing it down.

Create your own clean solutions and benchmark them yourself. It's kinda fun.

In JavaScript, which is overall more efficient? Using IFs statements, Swith-Case, or K-V pair object with anonymous function? I have seen people using IFs- S-C and my self using K-V objects(something I picked from C# unfortunately).

Unreadable code

Same here. Never seen one like this before and I am new to JS to begin with

nothing wrong with a classic

YandreDev'd

Almost the same

I like this

Edit: Oh wait, it is actually operating the other 3 as well, even if they are not selected? XD JS is weird.

You need to double the integer and return it.

You're squareing it, not doubling it.

My solution passes and it hasn't assignment.

One of the tests is telling me
"expected 16 to equal 8"

And one of the random ones is showing a negative as answer

Is this normal behavior?

I have the same thing. I am getting it as input. Shouldn't they be squared in the second list?
[42, 42]
[42, 42]

As well as the second guy who has an empty list which should return false, not true.