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ruby system command check exit code
I have a bunch of system calls in ruby such as the following and I want to check their exit codes simultaneously so that my script exits out if that command fails.
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What does a script-Tag with src AND content mean?
...the src script, regardless of success. Since this behaviour is unreliable (and prohibited in HTML5), it should be avoided.
Google isn't relying an any specific behaviour. Since the content is just an object literal (a value), executing it would not actually do anything except cause a silent error. ...
Get value from JToken that may not exist (best practices)
... exactly the behavior you want if you combine it with nullable value types and the ?? operator:
width = jToken.Value<double?>("width") ?? 100;
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str performance in python
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'%s' % 100000 is evaluated by the compiler and is equivalent to a constant at run-time.
>>> import dis
>>> dis.dis(lambda: str(100000))
8 0 LOAD_GLOBAL 0 (str)
3 LOAD_CONST 1 (100000)
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What is Python buffer type for?
...buffer in this case is a sub-string, starting at position 6 with length 5, and it doesn't take extra storage space - it references a slice of the string.
This isn't very useful for short strings like this, but it can be necessary when using large amounts of data. This example uses a mutable bytearr...
Better explanation of when to use Imports/Depends
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"Imports" is safer than "Depends" (and also makes a package using it a 'better citizen' with respect to other packages that do use "Depends").
A "Depends" directive attempts to ensure that a function from another package is available by attaching the other pa...
Build Maven Project Without Running Unit Tests
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If you want to skip running and compiling tests:
mvn -Dmaven.test.skip=true install
If you want to compile but not run tests:
mvn install -DskipTests
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How to revert a folder to a particular commit by creating a patch
...set e095 -- somefolder
However git reset doesn't update the working copy and the --hard option doesn't work with folders. So then use git checkout to make the working copy the same as the index:
git checkout -- somefolder
and then if you also want to remove any files added you also need todo:
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Why are there two build.gradle files in an Android Studio project?
After having imported an Eclipse project into Android Studio, I see two build.gradle files:
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How do I update a formula with Homebrew?
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I think can now just type brew upgrade outdated and skip all the complex crap.
– Warren P
Apr 6 '13 at 23:28
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