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What are the calling conventions for UNIX & Linux system calls (and user-space functions) on i386 an
...here are rules for when to pack structs into registers (rdx:rax on return) vs. in memory. See the ABI for details, and check compiler output to make sure your code agrees with compilers about how something should be passed/returned.
Note that the Windows x64 function calling convention has multi...
Putting a simple if-then-else statement on one line [duplicate]
...if syntax
fruit = 'Apple'
isApple = True if fruit == 'Apple' else False
vs
fruit = 'Apple'
isApple = False
if fruit == 'Apple' : isApple = True
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Delete last char of string
...for example http://blogs.msdn.com/b/ericlippert/archive/2009/05/18/foreach-vs-foreach.aspx)
Using some LINQ:
string strgroupids = groupIds.Aggregate(string.Empty, (p, q) => p + q + ',');
strgroupids = strgroupids.Substring(0, str1.Length - 1);
Without end-substringing:
string strgroupids = g...
Difference between e.target and e.currentTarget
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Here is a good example: joequery.me/code/event-target-vs-event-currenttarget-30-seconds
– Glenn Wark
Mar 1 '17 at 15:51
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What is a “cache-friendly” code?
... people in the field sometimes forget is column-major (ex. fortran,matlab) vs. row-major ordering (ex. c,c++) for storing two dimensional arrays. For example, consider the following matrix:
1 2
3 4
In row-major ordering, this is stored in memory as 1 2 3 4; in column-major ordering, this would be s...
How to create a directory in Java?
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mkdir vs mkdirs
If you want to create a single directory use mkdir
new File("/path/directory").mkdir();
If you want to create a hierarchy of folder structure use mkdirs
new File("/path/directory").mkdirs();
...
Parsing HTML using Python
...ml is extremely fast:
http://blog.dispatched.ch/2010/08/16/beautifulsoup-vs-lxml-performance/
http://www.ianbicking.org/blog/2008/03/python-html-parser-performance.html
And with cssselect it’s quite easy to use for scraping HTML pages too:
from lxml.html import parse
doc = parse('http://www.g...
Throw away local commits in Git
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@TarunKumar THANK YOU! I am using VS integration, and your solution was the only way I was able to wipe out a bunch of merge commits that I didn't want in a branch I didn't have permission to check in.
– DVK
Nov 13 '18 a...
Combining two Series into a DataFrame in pandas
...at you should prefer doing the concat once pd.concat([list_of_dataframes]) vs concating many times new_df = pd.DataFrame(); for df in list_of_dsf: new_df = pd.concat([new_df, df]) or similar.
– Andy Hayden
Oct 14 '15 at 22:07
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How to determine the screen width in terms of dp or dip at runtime in Android?
...tant difference between using Configuration's screenWidthDp/screenHeightDp vs DisplayMetrics widthPixels/heightPixels is Configuration returns the usable display dimensions (minus the status bar etc), while DisplayMetrics returns the full screen dimensions.
– Nick Baicoianu
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