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How does one use rescue in Ruby without the begin and end block
... Inline rescue is not a good practice as it rescues StandardError and all its subclasses, like NameError – meaning that even a typo in your code won't raise an error.. See thoughtbot.com/blog/don-t-inline-rescue-in-ruby.
– BrunoFacca
Sep 19 '19 at 18:25
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JavaScript - cannot set property of undefined
...initializer:
d[a] = {
greetings: b,
data: c
};
Or you could set all the properties of d in an anonymous function instance:
d = new function () {
this[a] = {
greetings: b,
data: c
};
};
If you're in an environment that supports ES2015 features, you can use comp...
To find whether a column exists in data frame or not
...
all(c("d", "e", "f") %in% colnames(dat))
– skan
Jul 28 '17 at 19:59
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...
differences between 2 JUnit Assert classes
...d junit.framework.Assert itself and your test class gained the ability to call the assert methods this way.
Since version 4 of JUnit, the framework uses Annotations for marking tests. So you no longer need to extend TestCase. But that means, the assert methods aren't available. But you can make a s...
How do I convert from stringstream to string in C++?
...g string object.
1) Returns a copy of the underlying string as if by calling rdbuf()->str().
2) Replaces the contents of the underlying string as if by calling rdbuf()->str(new_str)...
Notes
The copy of the underlying string returned by str is a temporary object that will b...
Is there a Newline constant defined in Java like Environment.Newline in C#?
...
In Android, call also requires API 19
– Hamzeh Soboh
Apr 12 '15 at 10:31
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What does $1 [QSA,L] mean in my .htaccess file?
...ce to give a complete tutorial, but here it is in short;
RewriteCond basically means "execute the next RewriteRule only if this is true". The !-l path is the condition that the request is not for a link (! means not, -l means link)
The RewriteRule basically means that if the request is done that m...
Force git stash to overwrite added files
...t stash apply:
$ git checkout stash -- .
$ git commit
This will restore all the files in the current directory to their stashed version.
If there are changes to other files in the working directory that should be kept, here is a less heavy-handed alternative:
$ git merge --squash --strategy-o...
How to drop columns by name in a data frame
I have a large data set and I would like to read specific columns or drop all the others.
11 Answers
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iOS: Access app-info.plist variables in code
...ode (right click the info.plist - select Open As) then you will get to see all the various key names you can use.
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