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When working with closures, Swift gives us a special shorthand parameter syntax that makes it extremely concise to write closures. This syntax automatically numbers parameter names as
$2, and so on – we can’t use names such as these in our own code, so when you see them it’s immediately clear these are shorthand syntax for closures.
As for when you should use them it’s really a big “it depends”:
$4that you need to compare against
$0Give them actual names and their meaning becomes clearer.
$0more than maybe two or three times, you should probably just give it a real name.
What matters is that your code is easy to read and easy to understand. Sometimes that means making it short and simple, but not always – choose shorthand syntax on a case by case basis.
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