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How to solve Operator '!=' cannot be applied to operands of type 'T' and 'T' [duplicate]
...
using System.Collections.Generic;
public class Test<T>
{
public T Value
{
get => _Value;
set
{
// operator== is undefined for generic T; EqualityComparer solves this
if (!EqualityComparer<T>.Defaul...
Python: Get relative path from comparing two absolute paths
...r']) # No common prefix: the root is the common prefix
'/'
You can thus test whether the common prefix is one of the paths, i.e. if one of the paths is a common ancestor:
paths = […, …, …]
common_prefix = os.path.commonprefix(list_of_paths)
if common_prefix in paths:
…
You can then...
Batch file to delete files older than N days
... Should be del @FILE, case matters Also I suggest using /c echo @FILE for testing
– Russell Steen
Sep 16 '09 at 14:55
40
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How do you remove duplicates from a list whilst preserving order?
...ve some alternatives: http://www.peterbe.com/plog/uniqifiers-benchmark
Fastest one:
def f7(seq):
seen = set()
seen_add = seen.add
return [x for x in seq if not (x in seen or seen_add(x))]
Why assign seen.add to seen_add instead of just calling seen.add? Python is a dynamic language, ...
No ConcurrentList in .Net 4.0?
...This was the goal of my ConcurrentList<T> implementation. But when I tested its performance in multithreaded scenarios, I found that simply synchronizing adds to a List<T> was faster. Basically, adding to a List<T> is lightning fast already; the complexity of the computational step...
'is' versus try cast with null check
...actually happens below the belt. Take a look at this example:
object o = "test";
if (o is string)
{
var x = (string) o;
}
This translates to the following IL:
IL_0000: nop
IL_0001: ldstr "test"
IL_0006: stloc.0 // o
IL_0007: ldloc.0 // o
IL_0008: isinst Syste...
Detect if device is iOS
...l answers below needs to take that into account now.
This might be the shortest alternative that also covers iOS 13:
function iOS() {
return [
'iPad Simulator',
'iPhone Simulator',
'iPod Simulator',
'iPad',
'iPhone',
'iPod'
].includes(navigator.platform)
// iPad on iOS ...
Converting any string into camel case
... function(match, index) {
if (+match === 0) return ""; // or if (/\s+/.test(match)) for white spaces
return index === 0 ? match.toLowerCase() : match.toUpperCase();
});
}
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improve ...
How can I include a YAML file inside another?
...tag in Mapping or Sequence mode:
Arguments in Sequence mode:
!include [tests/data/include.d/**/*.yaml, true]
Arguments in Mapping mode:
!include {pathname: tests/data/include.d/**/*.yaml, recursive: true}
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libpng warning: iCCP: known incorrect sRGB profile
... find . -type f -iname '*.png' -exec pngcrush -ow -rem allb -reduce {} \; (Tested on GNU/Linux)
– friederbluemle
Feb 16 '16 at 3:24
2
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