Range of hex values?

Discussion in 'Ruby' started by Ammar Ali, Oct 30, 2010.

  1. Ammar Ali

    Ammar Ali Guest


    In 1.8.[67] the following range does not produce what I expected:


    It only produces the characters between \x00 and \x39, while in
    1.9.[12] it produces the full expected range.
    I'm curious if this would be considered a bug, intentional, or I'm
    missing something?

    A workaround that does the right thing in all versions:

    (0..127).to_a.map {|c| c.chr}

    Ammar Ali, Oct 30, 2010
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  2. Ammar Ali

    ara.t.howard Guest

    you are relying on String#succ! there. read the docs to understand
    why it is not what you want.
    ara.t.howard, Oct 30, 2010
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  3. Ammar Ali

    Ammar Ali Guest

    [Note: parts of this message were removed to make it a legal post.]

    Thanks for the tip. I read the docs and it did shed some light on what is
    going on behind the scenes, but I still don't get why it works in 1.9. I
    will have to investigate further.

    Thanks again,
    Ammar Ali, Oct 30, 2010
  4. The ".to_a" is superfluous here. Here are other options

    127.times.map &:chr
    (0..127).map &:chr

    Kind regards

    Robert Klemme, Oct 31, 2010
  5. Ammar Ali

    Ammar Ali Guest

    Thanks Robert. Another great example of the "TIMTOWTDI-ness" of ruby
    and how one's view gets shaped by where they started from.

    I have a slight preference for the one that includes the range. It
    tells me just a little bit more about what the intention is. Obviously
    that's just a matter of taste, or lack thereof.

    I still haven't figured out why it works under 1.9. I guess
    String#succ has changed.

    Ammar Ali, Oct 31, 2010
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