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What's the simplest way to test whether a number is a power of 2 in C++?
.... Bitwise operators do not implement short circuiting and, hence, the code doesn't branch. This is preferable in situations where branch mispredictions are likely and when computing the rhs of the expression (that is, !(n & (n - 1))) is cheap.
– Cassio Neri
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Is there a way that I can check if a data attribute exists?
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Kong is right, if there is an empty value your code doesnt work. Use this instead : if (typeof $("#dataTable").attr('data-timer') !== "undefined") { ... }
– PierrickM
Aug 8 '13 at 15:45
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Quickly reading very large tables as dataframes
...se, I am assuming I know the types of the columns ahead of time, the table does not contain any column headers or row names, and does not have any pathological characters that I have to worry about.
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How to specify a min but no max decimal using the range data annotation attribute?
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It does show a stupid validation message though :( The field Fixed price discount must be between 0.01 and 1.79769313486232E+308.
– Piotr Kula
Jul 19 '13 at 9:28
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node.js execute system command synchronously
... This do something (other than provide shorter syntax) this doesn't? const execSync = require('child_process').execSync; code = execSync('node -v');
– user2503764
Apr 27 '17 at 18:06
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How to assign string to bytes array
...to underlying data".
Using [:] makes an array qualify as a slice.
A string does not qualify as a slice that can be copied to, but it qualifies as a slice that can be copied from (strings are immutable).
If the string is too long, copy will only copy the part of the string that fits.
This code:
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How to check certificate name and alias in keystore files?
... will display an exception:
keytool error: java.lang.Exception: Alias does not exist
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How to add an empty column to a dataframe?
...ys concatenate a new (empty) dataframe to the existing dataframe, but that doesn't feel as pythonic to me :)
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Automatically start a Windows Service on install
...l.exe. Even though I have set the Startup Method to Automatic, the service does not start when installed, I have to manually open the services and click start. Is there a way to start it either via the command line, or through the code of the Service?
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How to get the current URL within a Django template?
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request.path does not include query parameters like ?foo=bar. Use request.get_full_path instead.
– Flimm
Dec 7 '16 at 13:32
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