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Difference between HashSet and HashMap?
Apart from the fact that HashSet does not allow duplicate values, what is the difference between HashMap and HashSet ?
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Ruby Gem install Json fails on Mavericks and Xcode 5.1 - unknown argument: '-multiply_definedsuppres
...m encountering the exact same problem after updating Xcode to 5.1 and news from Apple aren't good. From Xcode 5.1 Release Notes:
The Apple LLVM compiler in Xcode 5.1 treats unrecognized command-line options as errors. This issue has been seen when building both Python native extensions and Ruby Ge...
How can I get the current PowerShell executing file?
...SCommandPath:
* Direct:
* Function: C:\Test\test.ps1
Notes:
Executed from C:\, but actual script is C:\Test\test.ps1.
No method tells you the passed invocation path (.\Test\test.ps1)
$PSCommandPath is the only reliable way, but was introduced in PowerShell 3
For versions prior to 3, no single ...
Configure apache to listen on port other than 80
...mpp, Appserv. All I have done is compiling apache, tomcat and jk connector from source and trying my best to make them work together.
– vivek.m
Oct 15 '10 at 11:06
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Should I add the Visual Studio .suo and .user files to source control?
...in any text editor. I just tested copy-pasting the relevant debug settings from the .user into the .csproj, then deleting the .user file. Debugging continued to work, happily reading the correct settings from their new location in the .csproj file. This should provide a way to commit debug setting...
Map vs Object in JavaScript
... very tightly integrated into the core of JavaScript which sets them apart from significantly Map beyond the difference in key support.
An immediate advantage is that you have syntactical support for Objects making it easy to access elements. You also have direct support for it with JSON. When used ...
How do I create a copy of an object in PHP?
...e same object without being references to the same value. This can be seen from this example: $a = new stdClass; $b =& $a; $a = 42; var_export($b); here $b is a reference to the variable $a; if you replace =& with a normal =, it is not a reference, and still points to the original object.
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string.charAt(x) or string[x]?
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From MDN:
There are two ways to access an individual character in a string. The first is the charAt method, part of ECMAScript 3:
return 'cat'.charAt(1); // returns "a"
The other way is to treat the string as an ar...
Why is the Java main method static?
...rameter. This is very, very much like what you do when you use reflection from Java - it just uses confusingly named native function calls instead.
It would be perfectly legal for you to write your own version of java.exe (the source is distributed with the JDK) and have it do something entirely d...
Detect all Firefox versions in JS
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This script detects all versions of Firefox, for Desktop, from version 1 to 46.
It's the third time I've tried to answer this question on StackOverflow because I kept finding new ways to break my script. However, I think it's working now. It's a great exercise to learn about Firef...