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Why use prefixes on member variables in C++ classes
A lot of C++ code uses syntactical conventions for marking up member variables. Common examples include
29 Answers
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Why does ++[[]][+[]]+[+[]] return the string “10”?
...ase it will come down to +"" or 0 (see specification details below).
Therefore, we can simplify it (++ has precendence over +):
++[[]][0]
+
[0]
Because [[]][0] means: get the first element from [[]], it is true that:
[[]][0] returns the inner array ([]). Due to references it's wrong to say [[]]...
How to validate an email address in JavaScript
...leapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form>
<p>Enter an email address:</p>
<input id='email'>
<button type='submit' id='validate'>Validate!</button>
</form>
<h2 id='result'></h2>
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Is there a way to detect if an image is blurry?
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Yes, it is. Compute the Fast Fourier Transform and analyse the result. The Fourier transform tells you which frequencies are present in the image. If there is a low amount of high frequencies, then the image is blurry.
Defining the terms 'low' and 'high' is up to yo...
How to .gitignore files recursively
...ipts/special/**/*.js
Should work according to this answer. It also works for me in Windows 7 using Sourcetree 1.6.12.0 and the version of git that it installs (1.8.4-preview20130916).
To gitignore every file and folder under a directory recursively:
MyPrject/WebApp/Scripts/special/**
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jQuery UI: Datepicker set year range dropdown to 100 years
...ected year ("c-nn:c+nn"), absolute ("nnnn:nnnn"), or combinations of these formats ("nnnn:-nn"). Note that this option only affects what appears in the drop-down, to restrict which dates may be selected use the minDate and/or maxDate options.
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libpthread.so.0: error adding symbols: DSO missing from command line
...es -Wall -Wno-sign-compare -Wpointer-arith -Wdeclaration-after-statement -Wformat-security -Wswitch-enum -Wunused-parameter -Wstrict-aliasing -Wbad-function-cast -Wcast-align -Wstrict-prototypes -Wold-style-definition -Wmissing-prototypes -Wmissing-field-initializers -Wno-override-init \
-g -O2...
Check if a Windows service exists and delete in PowerShell
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You can use WMI or other tools for this since there is no Remove-Service cmdlet until Powershell 6.0 (See Remove-Service doc)
For example:
$service = Get-WmiObject -Class Win32_Service -Filter "Name='servicename'"
$service.delete()
Or with the sc.exe t...
Using braces with dynamic variable names in PHP
... you are using this to include a variable (the most useful way IMHO) don't forget to use double quotes. ${'fixedTime$i'} = $row['timeInstance']; gives you a not very useful $fixedTime$i instead of $fixedTime1, $fixedTime2 etc. (Fortunately spotted it almost straight away.)
– Be...
sbt-assembly: deduplication found error
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Actually I think we should just overwrite merge strategy for META-INF leaving old strategies for the rest, so: assemblyMergeStrategy in assembly := { case PathList("META-INF", xs @ _*) => MergeStrategy.discard\n case x => val oldStrategy = (assemblyMergeSt...