Destroy All Software – My Summary after lesson 1

So, a few weeks ago I purchased and watched the first season of Destroy All Software screencasts (from Gary Bernhard), and it was awesome. I’d say there are different kinds of stuff to learn from it, depending on your personal interests and experience.

Here are my notes for some things I found useful and want to remember for later.

About Git

You can use the  git rev-list HEAD  command to get a list of commits in the current branch. This is useful for writing scripts to report something about each commit in the repo. You can, for example, check the evolution of line counts over the course of the project (or any other statistic like number of tests, number of files, etc). You can also run the tests for every commit in the history:

git rev-list HEAD | while read rev; do

   git checkout $rev && git clean -fd && make test;

done

Gary has a script ready for this: run-command-on-git-revisions

Git tracks everything that happens in the local repo, even stuff that is not shared when you push (like when you rewrite history doing a rebase). You can use  git reflog  to see the history of local changes and  git reset –hard REFLOG_ENTRY  to go back to where you were.

About design

Avoiding nil is good because it makes your code more predictable and tracebacks more understandable. When adding tests to a suite, it’s important to pay attention at your stubs. If they are getting complicated, the design can probably be improved in a way that will render better tests and better production code.

When adding extra functions to a 3rd party API, sometimes it’s tempting to do monkey-patching of the library for a small change. It’s usually better to use a wrapper it instead, because later you will probably need more changes and this will be easier if your production code is already using a wrapper.

Isolated tests are good because they run faster, they encourage better design and code clarity. This is something I’ve read about repeatedly in the past and also applied to some of the code I’ve done myself, so it’s not that new. But it was great to watch someone applying this on several different code bases, showing some interesting paths — it inspired me to apply a bit more of this in my work.

About Unix

To bring a background process to foreground, besides fg, you can also use %N where N is the job number reported by the command jobs. You can use the output of a command as if it were a filename, using <(COMMAND), like so:

$ diff <(echo) <(date)

1c1

<

---

> Sat Jan 17 18:47:48 BRST 2017

The shell will run the commands and pass to the program file descriptors with the proper contents, which you can verify doing:

$ echo <(ls -l) <(ls -l)

/dev/fd/63 /dev/fd/62

This is useful for commands like diff that need more than one input file (and therefore can’t just use the stdin), to use it with arbitrary stuff generated from other commands.

I found this specially helpful for when I want to refactor a script: before I make changes, I store its original output in a file and then while refactoring I keep comparing the output of the script with the file to see if I’m not breaking anything:

diff <(./my_script) original.txt

I can also be useful to see differences between two different versions of the same web application or sites:

diff <(curl -s http://somesite.com)  <(curl -s http://anothersite.com)

About vim

It’s nice to see people using vim well, because I can compare with my own habits and see things where I can improve. Gary seems to strive to keep a tight feedback loop in everything he’s doing, so seeing him using vim and the shell to build things in this fashion is pretty cool. I see it as a nice validation for the choice of tools.

I found myself using splits a bit more, after watching the screencasts. I’m more used to using vim tabs, mostly because I’m not much comfortable with stuff happening outside my view. This is probably something I can work better if I grow some tolerance for it.

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