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sebinsua's profile
Seb Insua
Seb Insua
Seb Insua
@sebinsua

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Seb Insua

@sebinsua

→ @nouswaves

London, England
sebinsua.com
Joined September 2015

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    1. Justin Falcone‏ @modernserf 5 Feb 2019
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      Justin Falcone Retweeted Richard Feldman

      what if DRY is wrong, even in the "single source of truth" sense? So many of our tools for program correctness are, essentially, about overlapping and redundant "sources of truth" -- type definitions, tests, contracts all verify your code's "truth" by duplicating some part of ithttps://twitter.com/rtfeldman/status/1092885754265489408 …

      Justin Falcone added,

      Richard Feldman @rtfeldman
      What's the thing in programming where we are most blind to its costs? I think it has to be code reuse. I bet if you had someone go through your issue tracker and label every bug that could ultimately be traced back to the pursuit of code reuse, the results would be horrifying.
      18 replies 22 retweets 116 likes
      Show this thread
    2. Robert E. P. Levy‏ @rplevy 6 Feb 2019
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      Replying to @modernserf

      That's an interesting thread to pursue but at minimum there would need to be editor support for keeping track of repeated pieces of code and changing (some of) them in tandem, because that is maddening otherwise.

      2 replies 0 retweets 0 likes
    3. Justin Falcone‏ @modernserf 6 Feb 2019
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      Replying to @rplevy

      What do you mean? Duplication is how everything works *now*, and the difficulty of making modifications (vs wholesale replacements) is what makes it useful

      1 reply 0 retweets 0 likes
    4. Robert E. P. Levy‏ @rplevy 6 Feb 2019
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      Replying to @modernserf

      If the same duplicated piece of code needs to be edited in multiple places when it changes it's a huge pain.

      2 replies 0 retweets 0 likes
    5. Seb Insua‏ @sebinsua 6 Feb 2019
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      Replying to @rplevy @modernserf

      The opposite problem is also bad though. When a piece of code is DRY and shared by 30+ things, and you need to change it for only 3 of those things. Particularly bad if you don't know what calls the function. A change is then potentially breaking for many unknown things.

      1 reply 0 retweets 0 likes
    6. Robert E. P. Levy‏ @rplevy 6 Feb 2019
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      Replying to @sebinsua @modernserf

      I think that underlines the wisdom of keeping functions single-purpose. If there's a variant on that purpose it should be a distinct function.

      1 reply 0 retweets 0 likes
    7. Seb Insua‏ @sebinsua 6 Feb 2019
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      Replying to @rplevy @modernserf

      What I mean is that somebody can fix a function, and think that their change is just an implementation detail. If it turns out that it is a breaking change it can cause bugs in the N callers that had different expectations of the function's behaviour.

      2 replies 0 retweets 1 like
      Seb Insua‏ @sebinsua 6 Feb 2019
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      Replying to @sebinsua @rplevy @modernserf

      Bugs are a much worse problem than duplication. DRY can be done, but you need to be careful about the consumers of the API. No semver here and every caller shares the same version of the code. So no guarantees that a change won't cause problems unless you test well.

      11:45 AM - 6 Feb 2019
      0 replies 0 retweets 0 likes

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