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Create list of single item repeated N times
... references to the same list, not n independent empty lists.
Performance testing
At first glance it seems that repeat is the fastest way to create a list with n identical elements:
>>> timeit.timeit('itertools.repeat(0, 10)', 'import itertools', number = 1000000)
0.37095273281943264
>...
Beyond Stack Sampling: C++ Profilers
...olution for profiling. Very hacky, but it did find the bottleneck." You're confirming my constant rant :) Some people want profiling to be pretty, but if results are what you need, go with what works, not what's pretty.
– Mike Dunlavey
Oct 23 '14 at 18:44
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What is the Scala annotation to ensure a tail recursive function is optimized?
...the compiler.
In Scala 2.7 or earlier, you will need to rely on manual testing, or inspection of the bytecode, to work out whether a method has been optimised.
Example:
you could add a @tailrec annotation so that you can be sure that your changes have worked.
import scala.annotation.t...
How can I get all constants of a type by reflection?
...not sure about the assertions with regards to IsLiteral and IsInitOnly. On testing it would seem that for static readonly properties IsLiteral is always false - so IsLiteral is the only flag you need to check to find constants and you can ignore IsInitOnly. I tried with different field types (e.g. S...
“x not in y” or “not x in y”
When testing for membership, we can use:
6 Answers
6
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Returning null as an int permitted with ternary operator but not if statement
...y on. This will generate a NullPointerException at run time, which you can confirm by trying it.
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Resize image proportionally with MaxHeight and MaxWidth constraints
...
Like this?
public static void Test()
{
using (var image = Image.FromFile(@"c:\logo.png"))
using (var newImage = ScaleImage(image, 300, 400))
{
newImage.Save(@"c:\test.png", ImageFormat.Png);
}
}
public static Image ScaleImage(Imag...
Is there a way for multiple processes to share a listening socket?
...erent thread but only one socket in the group performs the accept. Can you confirm all sockets in the group each get a copy of the data?
– jww
Oct 8 '18 at 11:54
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Differences between Java 8 Date Time API (java.time) and Joda-Time
...DateTimeUtils instead. So this way Joda-Time is also capable of supporting test-driven models with different clocks (mocking etc.).
Duration arithmetic
Both libraries support the calculation of time distances in one or more temporal units. However, when handling single-unit-durations the JSR-310-s...
Flexbox and Internet Explorer 11 (display:flex in ?)
...="Content-Type" content="text/html; charset=UTF-8" >
<title>Flex Test</title>
<style>
html, body {
margin: 0px;
padding: 0px;
height: 100vh;
}
.main {
display: -webkit-flex;
display: flex;
-ms-flex-direction: row;
flex-direction: row;
...