Copy and paste mistake

The code never has been not OK. It's just a copy from an example of the chapter before.
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@ -67,7 +67,7 @@ let welcome = (age < 18) ?
() => alert('Hello') :
() => alert("Greetings!");
welcome(); // ok now
welcome();
```
Arrow functions may appear unfamiliar and not very readable at first, but that quickly changes as the eyes get used to the structure.