# Reverse switch?

I recently saw something that caught my attention and I called it **Reverse Switch**. Probably there's a better name.

> A conditional switch where the expression takes boolean constants (`true` or `false`) and the switch cases take expressions.

Some like this:

```js
switch (true) {
  case isEven(x):
    console.log('x is even!')
    break
  case isPrime(x):
    console.log('x is prime!')
    break
  case x > 10:
    console.log('x is greater than 10')
    break
  default:
    console.log('x is not even, is not prime and is not greater than 10')
}
```

My head exploded because I never thought about it. 
I always did it as follows:

```js
if (isEven(x)) {
  console.log('x is even!')
} else if (isPrime(x)) {
  console.log('x is prime!')
} else if (x > 10) {
  console.log('x is greater than 10')
} else {
  console.log('x is not even, is not prime and is not greater than 10')
}
```

And here comes my question:

1. Have you seen or done something like that?
2. Do you think it is good practice?
3. Which one is more readable?

Let's talk about it!