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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...
Is there any particular difference between intval and casting to int - `(int) X`?
...ow earlier today, the base conversion does not work as expected if the argument is an int or float.
– t-dub
Oct 20 '11 at 4:23
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Ruby: How to iterate over a range, but in set increments?
...classes/Range.html#M000695 for the full API.
Basically you use the step() method. For example:
(10..100).step(10) do |n|
# n = 10
# n = 20
# n = 30
# ...
end
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