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How to create the most compact mapping n → isprime(n) up to a limit N?
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There are many ways to do the primality test.
There isn't really a data structure for you to query. If you have lots of numbers to test, you should probably run a probabilistic test since those are faster, and then follow it up with a deterministic test to make su...
What's a good way to extend Error in JavaScript?
...e object that is being thrown. Those things are guaranteed to be correct.
Test cases I used can be found here: JavaScript self-made Error object comparison.
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Cartesian product of x and y array points into single array of 2D points
... are faster than others, and some are more general-purpose. After a lot of testing and tweaking, I've found that the following function, which calculates an n-dimensional cartesian_product, is faster than most others for many inputs. For a pair of approaches that are slightly more complex, but are e...
How do I wait for an asynchronously dispatched block to finish?
I am testing some code that does asynchronous processing using Grand Central Dispatch. The testing code looks like this:
13...
Detect Safari using jQuery
...gger !== 'undefined';
var is_safari = /^((?!chrome|android).)*safari/i.test(navigator.userAgent);
Usage:
if (is_safari) alert('Safari');
Or for Safari only, use this :
if ( /^((?!chrome|android).)*safari/i.test(navigator.userAgent)) {alert('Its Safari');}
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Is null check needed before calling instanceof?
...y good question indeed. I just tried for myself.
public class IsInstanceOfTest {
public static void main(final String[] args) {
String s;
s = "";
System.out.println((s instanceof String));
System.out.println(String.class.isInstance(s));
s = null;
...
How to execute Python scripts in Windows?
...udio related, specifically when I try to run Python scripts in my AppVeyor tests. See help.appveyor.com/discussions/problems/….
– Jack O'Connor
Dec 21 '15 at 20:07
1
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How to get height of entire document with JavaScript?
...ated.
There used to be a complex best-practice formula around for how you tested for correct height/width. This involved using document.documentElement properties if available or falling back on document properties and so on.
The simplest way to get correct height is to get all height values foun...
What are the dangers when creating a thread with a stack size of 50x the default?
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Upon comparing test code with Sam, I determined that we are both right!
However, about different things:
Accessing memory (reading and writing) is just as fast wherever it is - stack, global or heap.
Allocating it, however, is fastest...
How can I display an image from a file in Jupyter Notebook?
...u can do the following:
from IPython.display import Image
Image(filename='test.png')
(official docs)
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