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colmmacc's profile
Colm MacCárthaigh
Colm MacCárthaigh
Colm MacCárthaigh
@colmmacc

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Colm MacCárthaigh

@colmmacc

AWS, Apache, Crypto, Irish Music, Haiku, Photography

Seattle
notesfromthesound.com
Joined April 2008

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    1. Colm MacCárthaigh‏ @colmmacc 23 Jul 2019
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      This also relates to a simple programming tip. It can be easy to fall into a pattern of ... if (condition1 == good) { ... if (condition2 == good) { ... if (condition3 == good) { do_something(); but this is bad and becomes dangerous.

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    2. Colm MacCárthaigh‏ @colmmacc 23 Jul 2019
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      Instead do: if (condition1 != good) { bail(); } ... if (condition2 != good) { bail(); } if (condition3 != good) { bail(); } usually makes context much clearer, avoids nesting confusion, and builds in that pattern of bailing!

      1 reply 1 retweet 48 likes
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    3. Colm MacCárthaigh‏ @colmmacc 23 Jul 2019
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      o.k. last piece of advice and it is ... don't write "what" comments, write "why" comments. If you have to comment on what your program is doing, then the code itself was not readable! Instead use comments to provide context.

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    4. Colm MacCárthaigh‏ @colmmacc 23 Jul 2019
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      Use readable variable names that are nouns and meaningful function names that are verbs. The code doesn't have to be poetry, but it can absolutely be easy to follow. Give your future self an easier time. Code is written to be read.

      1 reply 3 retweets 18 likes
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    5. Colm MacCárthaigh‏ @colmmacc 23 Jul 2019
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      Very very rarely there is code that can't be easily read; if you're using bitwise operators as part of cryptography or compression or something, for example. Comment those with a "WTF is this doing" ... be very very verbose. But that's the only exception I've found!

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    6. Colm MacCárthaigh‏ @colmmacc 23 Jul 2019
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      Which brings me to the $1000 programming contest! 3 prizes: $500, $300, $200 for the most readable, easy to follow, tested, Apache Software License 2.0'd, implementation of @lemire's nearly division-less RNG.https://lemire.me/blog/2019/06/06/nearly-divisionless-random-integer-generation-on-various-systems/ …

      4 replies 35 retweets 71 likes
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    7. Colm MacCárthaigh‏ @colmmacc 23 Jul 2019
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      I hope he doesn't mind because I didn't ask! I've chosen @lemire's algorithm because it is awesome and ground breaking, very short, and intrinsically hard to follow if you're not into the math.

      4 replies 1 retweet 7 likes
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    8. Colm MacCárthaigh‏ @colmmacc 23 Jul 2019
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      His blog post contains a 14 line implementation in C, and there's also a paper getting into it: https://arxiv.org/abs/1805.10941 , so there's great material to start from. But how can we make it more readable and easy to follow for a beginner or non-math-expert? how can we test it?

      1 reply 1 retweet 20 likes
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    9. Colm MacCárthaigh‏ @colmmacc 23 Jul 2019
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      Have at it and give it a go! Any programming language you like. Apache Software License so that it can be included in other things. Closing date: September 1st 2019.

      2 replies 1 retweet 5 likes
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    10. Colm MacCárthaigh‏ @colmmacc 23 Jul 2019
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      Message me a gist, or a link, or send me an e-mail, whatever works ... and we can talk readability and testing about it too!

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      Colm MacCárthaigh‏ @colmmacc 23 Jul 2019
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      For further reference: here's my rejection sampling RNG implementation with more comments than code. https://github.com/awslabs/s2n/blob/master/utils/s2n_random.c#L182 … End of thread!

      11:14 AM - 23 Jul 2019
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      • Andreas Ehrlich Alex Casalboni Ganga vladdy sridhar Dutta (((PabloColazurdo))) Pirmin Schmid sunnygleason Pushparaj Zala
      5 replies 1 retweet 14 likes
        1. Ganesh Swaminathan‏ @vattybear 24 Jul 2019
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          Replying to @colmmacc

          Any resources to help with the testing bits? Well tested code samples? Books? Guides? People to follow? Papers? Where to look to learn more about writing tests? (Thx for thread!)

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        1. Laurynas Tumosa‏ @LaurynasT2 24 Jul 2019
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          Replying to @colmmacc @lemire

          Great advice. Do you also have any tips for us infrastructure engineers? I mostly write app configs in Yaml, Cloudformation, Dockerfiles, build pipelines, but also some python scripts. Which arent very high quality because I don't practice it everyday.

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        1. Nimrod Aviram‏ @NimrodAviram 24 Jul 2019
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          Replying to @colmmacc @lemire

          Awesome advice, thanks! I will include this thread when teaching software engineering at my university :-)

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        1. Komu Wairagu‏ @komu_wairagu 14 Aug 2019
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          Replying to @colmmacc @lemire

          https://github.com/ziglang/zig/blob/98183e47436699f6e5eab200061c46eec342806e/std/rand.zig#L74-L118 …

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        1. New conversation
        2.  🦾 🧠 ⚗️‏ @trylks 26 Aug 2019
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          Replying to @colmmacc @lemire

          @threadreaderapp unroll this huge thread

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        3. Thread Reader App‏ @threadreaderapp 26 Aug 2019
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          Replying to @trylks

          Hello, please find the unroll here: Thread by @colmmacc: "Tuesday Tweet Thread time! Today's is special. 5 pieces of programming advice: write tests, think in data structures, le […]" https://threadreaderapp.com/thread/1153715663946444800.html … See you soon. 🤖

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        4. End of conversation

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