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window.onload vs
...l of the common JavaScript libraries, Prototype, ExtJS, Dojo, JQuery, YUI, etc. provide nice wrappers around events that occur as the document is loaded. You can listen for the window onLoad event, and react to that, but onLoad is not fired until all resources have been downloaded, so your event han...
How to import a module given the full path?
...on path can contain zip archives, "eggs" (a complex kind of zip archives), etc. Modules can be imported out of them. So the path elements are indeed containers of files, but they are not necessarily directories.
– alexis
Apr 30 '15 at 21:21
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Unnecessary curly braces in C++?
...p myself happy (i.e. to separate out unrelated concerns, variable locality etc.), I use just this technique as elaborated by @unwind.
– ossandcad
Mar 16 '12 at 15:58
21
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Unit testing with Spring Security
...ent: session-scoped in a Servlet container, thread-scoped in a JUnit test, etc. The real limiting factor of a Singleton is when it provides an implementation that is inflexible to different environments.
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Programmatically find the number of cores on a machine
...umCPU = sysconf(_SC_NPROCESSORS_ONLN);
FreeBSD, MacOS X, NetBSD, OpenBSD, etc.
int mib[4];
int numCPU;
std::size_t len = sizeof(numCPU);
/* set the mib for hw.ncpu */
mib[0] = CTL_HW;
mib[1] = HW_AVAILCPU; // alternatively, try HW_NCPU;
/* get the number of CPUs from the system */
sysctl(mib, ...
How to Correctly Use Lists in R?
...where the first element is a character vector, the second is a data frame, etc. In this case, you have created two different lists. x has four vectors, each of length 1. x2 has 1 vector of length 4:
> length(x[[1]])
[1] 1
> length(x2[[1]])
[1] 4
So these are completely different lists.
R l...
JavaScript check if variable exists (is defined/initialized)
...(Assuming the variable could hold anything (string, int, object, function, etc.))
28 Answers
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C# Lambda expressions: Why should I use them?
...# expressions in to the SQL expressions desired for filtering / ordering / etc. on the server side.
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notifyDataSetChanged example
I'm trying to use in my Android Application the notifyDataSetChanged() method for an ArrayAdapter but it doesn't work for me.
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R object identification
...t(d=1:26, e=letters))
data(cars)
obj <- lm(dist ~ speed, data=cars)
..etc.
If obj is an S3 or S4 object, you can also try methods or showMethods, showClass, etc. Patrick Burns' R Inferno has a pretty good section on this (sec #7).
EDIT: Dirk and Hadley mention str(obj) in their answers. It ...