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Check whether variable is number or string in JavaScript
... @George According to the OP, only existing variables will be tested.
– Sampson
May 17 '11 at 20:27
3
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What does the Java assert keyword do, and when should it be used?
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@ElMac - assertions are for the dev/debug/test parts of the cycle - they are not for production. An if block runs in prod. Simple assertions won't break the bank, but expensive assertions that do complex data validation might bring down your production environment,...
How to generate sample XML documents from their DTD or XSD?
...substantial amount of XML transformations. We do not have any proper input test data per se, only DTD or XSD files. We'd like to generate our test data ourselves from these files. Is there an easy/free way to do that?
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Which equals operator (== vs ===) should be used in JavaScript comparisons?
...when comparing, and is therefore faster (as according to This JS benchmark test) as it skips one step.
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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, $i, NULL );
...
Finding the source code for built-in Python functions?
...y
Modules/_<module>.c (if there’s also a C accelerator module)
Lib/test/test_<module>.py
Doc/library/<module>.rst
For extension-only modules, the typical layout is:
Modules/<module>module.c
Lib/test/test_<module>.py
Doc/library/<module>.rst
For buil...
Check if character is number?
...ou can use regexp like this:
function is_numeric(str){
return /^\d+$/.test(str);
}
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NSUserDefaults removeObjectForKey vs. setObject:nil
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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...
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
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