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Hidden features of Ruby
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From Ruby 1.9 Proc#=== is an alias to Proc#call, which means Proc objects can be used in case statements like so:
def multiple_of(factor)
Proc.new{|product| product.modulo(factor).zero?}
end
case number
when multiple_of...
@synthesize vs @dynamic, what are the differences?
...; field). If the value is being produce by something else (e.g. calculated from other fields) then you have to use @dynamic.
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How to identify if the DLL is Debug or Release build (in .NET) [duplicate]
...at you are looking for (thanks to Mr. Black) there are tools like Dot Peek from JetBrains that will give you this information. With Dot Peek you double click on the assembly itself in the Assembly Explorer (not any files under the assembly) and it will show you all the Assembly attributes that he i...
Are C++ enums signed or unsigned?
...3 Enum type is a distinct type of its own having no concept of sign. Since from C++03 standard dcl.enum
7.2 Enumeration declarations
5 Each enumeration defines a type that is different from all other types....
So when we are talking about the sign of an enum type, say when comparing 2 enum opera...
Why am I seeing an “origin is not allowed by Access-Control-Allow-Origin” error here? [duplicate]
...pt tag into the head part of your html (you know that you can load scripts from different domains than yours here).
However, to use jsonp the server must be configured properly. If this is not the case you cannot use jsonp and you MUST rely on a server side proxy (PHP, ASP, etc.). There are plenty o...
Programmer-friendly search engine? [closed]
...rching for APi documentation the engine should also extract valid examples from eg blog posts and show them to us. Et cetera.
For the full paper, please refer to: "Assieme, Finding and Leveraging Implicit References
in a Web Search Interface for Programmers"
PS: If you are interest in the latest...
Purge Kafka Topic
...room-data --config retention.ms=1000 WARNING: Altering topic configuration from this script has been deprecated and may be removed in future releases. Going forward, please use kafka-configs.sh for this functionality
– Alper Akture
Nov 18 '15 at 19:42
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How do I get the file extension of a file in Java?
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In this case, use FilenameUtils.getExtension from Apache Commons IO
Here is an example of how to use it (you may specify either full path or just file name):
String ext1 = FilenameUtils.getExtension("/path/to/file/foo.txt"); // returns "txt"
String ext2 = FilenameUtil...
Python Infinity - Any caveats?
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You can still get not-a-number (NaN) values from simple arithmetic involving inf:
>>> 0 * float("inf")
nan
Note that you will normally not get an inf value through usual arithmetic calculations:
>>> 2.0**2
4.0
>>> _**2
16.0
>>> _...
Getting indices of True values in a boolean list
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For huge lists, it'd be better to use itertools.compress:
>>> from itertools import compress
>>> list(compress(xrange(len(t)), t))
[4, 5, 7]
>>> t = t*1000
>>> %timeit [i for i, x in enumerate(t) if x]
100 loops, best of 3: 2.55 ms per loop
>>> %timei...