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Is there any overhead to declaring a variable within a loop? (C++)
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@toto A variable like this could also be nowhere – the var variable is initialized but never used, so a reasonable optimiser can just remove it completely (except the second snippet if the variable was used somewhere after the loop).
– CiaPan...
Showing the stack trace from a running Python application
... a process will be running for a long time but gets stuck sometimes for unknown and irreproducible reasons. Its a bit hacky, and only works on unix (requires signals):
import code, traceback, signal
def debug(sig, frame):
"""Interrupt running process, and provide a python prompt for
inter...
filter for complete cases in data.frame using dplyr (case-wise deletion)
... are a lot of variables and b) impossible when the variable names are not known (e.g. in a function that processes any data.frame).
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Bundler: Command not found
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Under uBuntu 11.04, the latest command path is now export PATH=$PATH:/var/lib/gems/1.8/bin
– Antony
Jul 16 '11 at 2:13
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Number of elements in a javascript object
...ntProperties(obj) {
var count = 0;
for(var prop in obj) {
if(obj.hasOwnProperty(prop))
++count;
}
return count;
}
In case of ECMAScript 5 capable implementations, this can also be written as (Kudos to Avi Flax)
function countProperties(obj) {
return Objec...
ASP.NET MVC: What is the purpose of @section? [closed]
...write up on this very interesting.
Edit: Based on additional question clarification
The @RenderSection syntax goes into the Shared View, such as:
<div id="sidebar">
@RenderSection("Sidebar", required: false)
</div>
This would then be placed in your view with @Section syntax:
@s...
How to check if a file exists in Go?
Go's standard library does not have a function solely intended to check if a file exists or not (like Python's os.path.exists ). What is the idiomatic way to do it?
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Quickest way to convert a base 10 number to any base in .NET?
... used to convert a number to its equivalent string representation in a specified base.
Example:
string binary = Convert.ToString(5, 2); // convert 5 to its binary representation
Console.WriteLine(binary); // prints 101
However, as pointed out by the comments, Convert.ToString only s...
How to make the python interpreter correctly handle non-ASCII characters in string operations?
...s ascii as the default encoding for source files, which means you must specify another encoding at the top of the file to use non-ascii unicode characters in literals. Python 3 uses utf-8 as the default encoding for source files, so this is less of an issue.
See:
http://docs.python.org/tutorial/int...
How to search a string in multiple files and return the names of files in Powershell?
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What if you want to also MOVE those files?... I'm getting an error with this where I can't join a | Move-Item to the end of that.
– rud3y
Sep 5 '12 at 12:57
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