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List of Big-O for PHP functions
...ose who doubt that PHP array lookups are O(N), I've written a benchmark to test that (they are still effectively O(1) for most realistic values).
$tests = 1000000;
$max = 5000001;
for( $i = 1; $i <= $max; $i += 10000 ) {
//create lookup array
$array = array_fill( 0, $i, NULL );
...
Finding the source code for built-in Python functions?
...y
Modules/_<module>.c (if there’s also a C accelerator module)
Lib/test/test_<module>.py
Doc/library/<module>.rst
For extension-only modules, the typical layout is:
Modules/<module>module.c
Lib/test/test_<module>.py
Doc/library/<module>.rst
For buil...
NSUserDefaults removeObjectForKey vs. setObject:nil
...
Swift 3.0
The below answer is no longer the case when I tested this.
When set to nil the result is NSCFData being stored. Possibly an NSNull object reference, but I am not positive.
To completely remove a value for a key use UserDefaults.standard.removeObject(forKey: "YourDefaul...
Check if character is number?
...ou can use regexp like this:
function is_numeric(str){
return /^\d+$/.test(str);
}
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Can you target with css?
...ut CSS1-based
formatters must treat ‘BR’ specially.
Grant Wagner's tests show that there is no way to style BR as you can do with other elements. There is also a site online where you can test the results in your browser.
Update
pelms made some further investigations, and pointed out that...
Does Parallel.ForEach limit the number of active threads?
...a few hours I watched the Parallel library spin off over 8,000 threads. I tested using MaxDegreeOfParallelism and sure enough the 8000+ threads disappeared. I have tested it multiple times now with the same result.
– Jake Drew
Jun 24 '16 at 6:40
...
IE7 Z-Index Layering Issues
I've isolated a little test case of IE7's z-index bug, but don't know how to fix it.
I have been playing with z-index all day long.
...
How should I use git diff for long lines?
... line.
For example, instead of getting something like this:
diff --git a/test-file.txt b/test-file.txt
index 19e6adf..eb6bb81 100644
--- a/test-file.txt
+++ b/test-file.txt
@@ -1 +1 @@
-this is a short line
+this is a slightly longer line
You might get something like this:
diff --git a/test-fil...
How do I use extern to share variables between source files?
... for the variable is allocated in another file.
Say you have two .c-files test1.c and test2.c. If you define a global variable int test1_var; in test1.c and you'd like to access this variable in test2.c you have to use extern int test1_var; in test2.c.
Complete sample:
$ cat test1.c
int test1_va...
Is there a C# type for representing an integer Range?
... the range.</summary>
/// <param name="value">The value to test</param>
/// <returns>True if the value is inside Range, else false</returns>
public bool ContainsValue(T value)
{
return (this.Minimum.CompareTo(value) <= 0) && (value.Com...