Build a minimal decorator with Ruby in 30 minutes

Re:Build a minimal decorator with Ruby in 30 minutes by ricardobeat on Thursday June 12, 2025 @05:50AM (#44255761)

I don’t get how this works. Won’t the spaceship operator always return 1, 0, -1?

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Re:Build a minimal decorator with Ruby in 30 minutes by onli on Thursday June 12, 2025 @05:56AM (#44255788)

Yes. And then clamp(0..) removes the -1, maps it to a 0. Why you'd want that? No idea.

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Re:Build a minimal decorator with Ruby in 30 minutes by mdoliwa on Thursday June 12, 2025 @06:35AM (#44256011)

so this just says if we have free places or not? students.size < maximum_number_of_students

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Re:Build a minimal decorator with Ruby in 30 minutes by jackbracken on Thursday June 12, 2025 @06:45AM (#44256084)

It gives the number of free places, hinted by the method name `available_places`

Needlessly ugly way to write it imo though

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Re:Build a minimal decorator with Ruby in 30 minutes by vidarh on Thursday June 12, 2025 @07:29AM (#44256414)

I think it probably made sense to the author because they've used all three (-1,0,1) for other examples, and would've been fine until separated out to a method reused to show the actual number.

I think they tried to be a bit too clever, basically.

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Re:Build a minimal decorator with Ruby in 30 minutes by onli on Thursday June 12, 2025 @06:54AM (#44256143)

But it doesn't. The code will only ever output 0 or 1. With a regular <=> operator at least.

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Re:Build a minimal decorator with Ruby in 30 minutes by mdoliwa on Thursday June 12, 2025 @07:17AM (#44256314)

yeah, so basically 1 we have available places, 0 we do not.

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