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How do you run a single test/spec file in RSpec?
I want to be able to run a single spec file's tests — for the one file I'm editing, for example. rake spec executes all the specs. My project is not a Rails project, so rake spec:doc doesn't work.
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valueOf() vs. toString() in Javascript
...function () { return "foo"; },
valueOf: function () { return 42; }
};
alert(x); // foo
"x=" + x; // "x=42"
x + "=x"; // "42=x"
x + "1"; // 421
x + 1; // 43
["x=", x].join(""); // "x=foo"
The toString function is not "trumped" by valueOf in general. The ECMAScript standard actually answers th...
What are the differences between numpy arrays and matrices? Which one should I use?
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Actually, timeit tests show ndarray operations such as np.dot(array2, array2) are faster than matrix1*matrix2. This makes sense because matrix is a subclass of ndarray which overrides special methods like __mul__. matrix.__mul__ calls np.dot....
Counting inversions in an array
...on in C++11, including a general iterator-based solution and sample random testbed using sequences from 5-25 elements. Enjoy!.
– WhozCraig
Apr 20 '14 at 20:15
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Can I target all tags with a single selector?
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This does not work. Please test your code before posting an answer as this is detrimental to anyone who may try using it. I edited your answer with tested and working code.
– Hybrid web dev
Nov 28 '19 at 22:22
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Downloading Java JDK on Linux via wget is shown license page instead
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Here are some guides for command line lovers.
For Debian like systems (tested on Debian squeeze and Ubuntu 12.x+)
su -
echo "deb http://ppa.launchpad.net/webupd8team/java/ubuntu precise main" | tee -a /etc/apt/sources.list
echo "deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu precise m...
Rails check if yield :area is defined in content_for
...stance_variable_defined?(content_var_name) is a bit neater than instead of testing whether it is nil. Second bigger point, the content_for instance variable is deprecated so your solution is not future proof
– Dave Nolan
Jan 23 '09 at 22:51
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How to set environment variables in Python?
... python script is running, calling os.environ again will not reflect the latest values.
Excerpt from the docs:
This mapping is captured the first time the os module is imported,
typically during Python startup as part of processing site.py. Changes
to the environment made after this time ar...
get UTC time in PHP
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I used simple php script to test the scenario:<? echo time()." === ".strtotime(gmdate("M d Y H:i:s"))." Timezone: ".date("Z")."\n"; ?> When i ran it i get this result: 1456342082 === 1456338482 Timezone: 3600 The result of shell command date is:...
How do you find the current user in a Windows environment?
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I use this method in writing batch files for testing.
echo %userdomain%\%username%
Since you must include the password in plain text if authentication is required, I will only use it in a completely private environment where other users cannot view it or if a user s...