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Editorial Team
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Asked: 2026-05-23T23:35:42+00:00

I tested following code with ruby 1.9.2 . hello.unpack(‘H*’) => [68656c6c6f] > hello.unpack(‘h*’) =>

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I tested following code with ruby 1.9.2 .

"hello".unpack('H*')
 => ["68656c6c6f"] 
> "hello".unpack('h*')
 => ["8656c6c6f6"]

Why the result of h* is off by 1. Also I thought nibble is 4 bits. However 68, 65, 6c, 6c and 6f are all taking one byte.

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1 Answer

  1. Editorial Team

    The difference between h* and H* is the order they write the halves of the byte (nibbles). h writes lower half byte first and H writes the higher half byte first.

    And yes, nibble is half of the byte – that is 4 bits.

    You can check out with detailed usage of pack/unpack in this post

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