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Build and Version Numbering for Java Projects (ant, cvs, hudson)
...ent best-practices for systematic build numbering and version number management in Java projects? Specifically:
9 Answers
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Get MD5 hash of big files in Python
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Break the file into 8192-byte chunks (or some other multiple of 128 bytes) and feed them to MD5 consecutively using update().
This takes advantage of the fact that MD5 has 128-byte digest blocks (8192 is 128×64). Since you're not reading the entire file into memory,...
Most efficient way to concatenate strings?
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The StringBuilder.Append() method is much better than using the + operator. But I've found that, when executing 1000 concatenations or less, String.Join() is even more efficient than StringBuilder.
StringBuilder sb = new StringBuilder();
sb.Append(so...
Programmatically find the number of cores on a machine
...no portable way. Instead, you'll need to use one or more of the following methods (guarded by appropriate #ifdef lines):
Win32
SYSTEM_INFO sysinfo;
GetSystemInfo(&sysinfo);
int numCPU = sysinfo.dwNumberOfProcessors;
Linux, Solaris, AIX and Mac OS X >=10.4 (i.e. Tiger onwards)
int numCPU...
Difference between an API and SDK
...developer the difference between an API an SDK. I need to explain why a commercial fingerprint software vendor will likely not provide an SDK, although they may certainly have used one.
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Selecting the first “n” items with jQuery
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You probably want to read up on slice. Your code will look something like this:
$("a").slice(0,20)
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Sort a list by multiple attributes?
...e:
s = sorted(s, key = lambda x: (x[1], x[2]))
Or you can achieve the same using itemgetter (which is faster and avoids a Python function call):
import operator
s = sorted(s, key = operator.itemgetter(1, 2))
And notice that here you can use sort instead of using sorted and then reassigning:
s...
What does the term “porcelain” mean in Git?
The term "porcelain" appears occasionally in the Git documentation. What does it mean?
9 Answers
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Are Mutexes needed in javascript?
I have seen this link: Implementing Mutual Exclusion in JavaScript .
On the other hand, I have read that there are no threads in javascript, but what exactly does that mean?
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Static nested class in Java, why?
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The Sun page you link to has some key differences between the two:
A nested class is a member of its enclosing class. Non-static nested classes (inner classes) have access to other members of the enclosing class, even if they are declared private. Stat...