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How does having a dynamic variable affect performance?
...on time)
Using a dynamically-generated method that gets created before the test.
Using a dynamically-generated method that gets lazily instantiated during the test.
Each gets called 1 million times in a simple loop. Here are the timing results:
Direct: 3.4248ms
Dynamic: 45.0728ms
Reflection: 888.4...
Convert Array to Object
...er than manipulating the initial object that was created. Running a JSPerf test on an array of 1000 elements, creating a new object every time is 1,000 times slower than mutating the existing object. jsperf.com/…
– romellem
Nov 26 '19 at 17:00
...
Facebook Like Button - how to disable Comment pop up?
...ke button (be careful to refresh your page after unliking the link you are testing with) and then start typing, the <div> stays the same size but shows the text entry box, then press tab and the Close and Post buttons become visible. Not good. I was testing with Firefox.
–...
Meaning of Git checkout double dashes
...ning the DWIM heuristic).
(DWIM: Do What I Mean)
Note that we didn't test the original feature in 28fcc0b71a at all.
So this patch not only tests for these corner cases, but also adds a regression test for the existing behavior.
...
How to delete items from a dictionary while iterating over it?
...ct.keys() to a list by list(mydict.keys()) and it should work.
A simple test in the console shows you cannot modify a dictionary while iterating over it:
>>> mydict = {'one': 1, 'two': 2, 'three': 3, 'four': 4}
>>> for k, v in mydict.iteritems():
... if k == 'two':
... ...
MSBUILD : error MSB1008: Only one project can be specified
...ublishDir="\\BSIIS3\c$\DATA\WEBSITES\benesys.net\benesys.net\TotalEducationTest\\"
This way we can use quotes for paths that have whitespace in properties that MSBuild requires the trailing slash.
I know this is an old post, but I feel like I needed to share this with someone :-)
...
How do I (or can I) SELECT DISTINCT on multiple columns?
... the performance of the currently accepted answer by factor 10 - 15 (in my tests on PostgreSQL 8.4 and 9.1).
But this is still far from optimal. Use a NOT EXISTS (anti-)semi-join for even better performance. EXISTS is standard SQL, has been around forever (at least since PostgreSQL 7.2, long before...
Javascript swap array elements
...uch more neatly:"
[ list[x], list[y] ] = [ list[y], list[x] ];
My quick tests showed that this Pythonic code works great in the version of JavaScript
currently used in "Google Apps Script" (".gs").
Alas, further tests show this code gives a "Uncaught ReferenceError: Invalid left-hand side in assi...
Reading CSV file and storing values into an array
...ic void Main(string[] args)
{
using(var reader = new StreamReader(@"C:\test.csv"))
{
List<string> listA = new List<string>();
List<string> listB = new List<string>();
while (!reader.EndOfStream)
{
var line = reader.ReadLine(...
Change text color based on brightness of the covered background area?
...B value.
Something like this: http://jsfiddle.net/2VTnZ/2/
var rgb = $('#test').css('backgroundColor');
var colors = rgb.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);
var brightness = 1;
var r = colors[1];
var g = colors[2];
var b = colors[3];
var ir = Math.floor((255-r)*brightness);
var ig = Math....