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How do I find out if first character of a string is a number?
...harAt(0) and substring(0, 1) will throw a StringIndexOutOfBoundsException. startsWith does not have this problem.
To make the entire condition one line and avoid length checks, you can alter the regexes to the following:
s.matches("\\d.*")
// or the equivalent
s.matches("[0-9].*")
If the conditi...
How do I ignore files in Subversion?
...irectories.
I note that the command-line syntax is counter-intuitive.
I started-off assuming that you would ignore a file in SVN by typing something like svn ignore pathToFileToIgnore.txt however this is not how SVN's ignore feature works.
3- The svn:global-ignores property. Requires SVN 1.8 (...
Test for existence of nested JavaScript object key
...ethod are null or undefined, otherwise it will call the function.
You can start playing with this feature with Babel using the optional chaining plugin.
Since Babel 7.8.0, ES2020 is supported by default
Check this example on the Babel REPL.
????????UPDATE: December 2019 ????????
The optional ch...
Pass data to layout that are common to all pages
...g. I use Controller.OnActionExecuting method to populate it.
Then, at the start of layout you can pull this object back from ViewBag and continue to access this strongly typed object.
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impro...
What is a mutex?
...egment if the mutex is only ever used around that code but, the minute you start using the mutex in multiple places in your code, your explanation fails. Typically it can also be used to protect some data structure, which may be accessed from many places in the code.
– paxdiabl...
What is the optimal algorithm for the game 2048?
...hly unlikely (e.g. it was reached by getting 6 "4" tiles in a row from the starting position). The typical search depth is 4-8 moves.
Heuristics
Several heuristics are used to direct the optimization algorithm towards favorable positions. The precise choice of heuristic has a huge effect on the pe...
Should I use multiplication or division?
...e makes it unclear when to apply rules #1 and #2, leaving us back where we started: We need to decide which optimizations are worthwhile and which ones are not. Pretending the answer is obvious is not an answer.
– Matt
Jan 19 '16 at 10:15
...
NAnt or MSBuild, which one to choose and when?
....
MSBuild:
Built-in to .NET.
Integrated with Visual Studio
Easy to get started with MSBuild in Visual Studio - it's all behind the scenes. If you want to get deeper, you can hand edit the files.
Subjective Differences: (YMMV)
NAnt documentation is a little more straightforward. For example, ...
How do I setup a SSL certificate for an express.js server?
...
4.0 you have /bin/www file, which you are going to add https here.
"npm start" is standard way you start express 4.0 server.
readFileSync() function should use __dirname get current directory
while require() use ./ refer to current directory.
First you put private.key and public.cert file unde...
UTF-8, UTF-16, and UTF-32
...ot predominant, since it uses 2 bytes per character, primarily. UTF-8 will start to use 3 or more bytes for the higher order characters where UTF-16 remains at just 2 bytes for most characters.
UTF-32 will cover all possible characters in 4 bytes. This makes it pretty bloated. I can't think of any ...