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Difference between single and double quotes in Bash
...pansions). The backslash retains its special meaning only when followed by one of the following characters: $, `, ", \, or newline. Within double quotes, backslashes that are followed by one of these characters are removed. Backslashes preceding characters without a special meaning are left unmodifi...
What is the explicit promise construction antipattern and how do I avoid it?
...ain with .then and you can return promises directly. Your code in getStuffDone can be rewritten as:
function getStuffDone(param){
return myPromiseFn(param+1); // much nicer, right?
}
Promises are all about making asynchronous code more readable and behave like synchronous code without hiding ...
Allow multiple roles to access controller action
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This is okay if you only have one controller that you need to authorize. If you have more than one, you're duplicating those string constants (yuck). I much prefer the static class that has the role names. My pet hate is duplicate strings... so so bad.
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Is there a JSON equivalent of XQuery/XPath?
...vides for Javascript and PHP. If you need a Java implementation, there’s one here: code.google.com/p/json-path
– Matthias Ronge
Nov 16 '12 at 7:20
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unix - head AND tail of file
...e.g. output from a command), you can use 'tee' to fork the stream and send one stream to head and one to tail. This requires using either the '>( list )' feature of bash (+ /dev/fd/N):
( COMMAND | tee /dev/fd/3 | head ) 3> >( tail )
or using /dev/fd/N (or /dev/stderr) plus subshells wit...
Why do we need private subnet in VPC?
...ill be used as described, or the Managed NAT Gateway service can be provisioned, instead. An expanded version of this answer integrating more information about NAT Gateway and how it compares to a NAT instance will be forthcoming, as these are both relevant to the private/public subnet paradigm in ...
How can I assign the output of a function to a variable using bash?
...here any way to do it in the same shell?
– Limited Atonement
May 2 '18 at 15:58
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Using ViewPagerIndicator library with Android Studio and Gradle
...n repo, which contains a packaged aar that they put together. Once that's done, you can simply add this line to your dependencies and everything should work once you sync your project with your gradle files.
Make sure that the Maven Repo is listed above the mavenCentral() entry. Otherwise, it will ...
How to put a line comment for a multi-line command [duplicate]
... for. The best you can do is a comment on the lines before the command, or one single comment at the end of the command line, or a comment after the command.
You can't manage to intersperse comments inside a command this way. The \s express an intent to merge lines, so for all intents and purposes ...
__getattr__ on a module
...ort time) should be no longer necessary.
In Python 3.7+, you just use the one obvious way. To customize attribute access on a module, define a __getattr__ function at the module level which should accept one argument (name of attribute), and return the computed value or raise an AttributeError:
#...