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Editorial Team
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Asked: 2026-06-05T12:25:48+00:00

I’ve only seen something like rand(1..5) work in MRI ruby 1.9.3 (haven’t tried 1.9.2).

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I’ve only seen something like rand(1..5) work in MRI ruby 1.9.3 (haven’t tried 1.9.2). Jruby doesn’t support it, even in 1.9 mode – it raises a TypeError.

Even ruby-doc doesn’t mention that Ranges are supported. What’s the official behavior?

UPDATE

Well as the answers and comments point out, only 1.9.3 supports it. Jruby is only at 1.9.2.

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1 Answer

  1. Editorial Team

    The docs do say that it is supported

    If max is Range, returns a pseudorandom number where range.member(number) == true.

    It’s also in the 1.9.3 changelog

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