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How can I check if a string is null or empty in PowerShell?
Is there a built-in IsNullOrEmpty -like function in order to check if a string is null or empty, in PowerShell?
11 Answers...
Sticky and NON-Sticky sessions
...ct way of one knowing what is there in the session object of the other. In order to synchronize between these server sessions, you may have to write/read the session data into a layer which is common to all - like a DB. Now writing and reading data to/from a db for this use-case may not be a good id...
Can you help me understand Moq Callback?
...your mock, but they happen concurrently. So you have no way of knowing the order in which they'd get called, but you want to know the calls you expected did take place (irrespective of order). You can do something like this:
var cq = new ConcurrentQueue<bool>();
mock.Setup(f => f.Bar(It.Is...
How should you build your database from source control?
...scripts named liked 001_AlterXXX.sql, so that running them in natural sort order will upgrade from version A to B)
Which types of objects shouldn't be version controlled?
Sequences?
Grants?
User Accounts?
see 2. If your users/roles (or technical user names) are different between environments, yo...
How do I update a GitHub forked repository?
...rebased your branch onto upstream/master you may need to force the push in order to push it to your own forked repository on GitHub. You'd do that with:
git push -f origin master
You only need to use the -f the first time after you've rebased.
...
Why is lock(this) {…} bad?
...enerally out of your control who else might be locking on that object.
In order to properly plan parallel operations, special care should be taken to consider possible deadlock situations, and having an unknown number of lock entry points hinders this. For example, any one with a reference to the o...
What are enums and why are they useful?
...tants, which may override methods).
Implementing an interface (or more) in order to not bind the client code to the enum (which should only provide a set of default implementations).
The simplest example would be a set of Comparator implementations:
enum StringComparator implements Comparator<...
Check synchronously if file/directory exists in Node.js
...t the top, followed by the various answers over the years in chronological order:
Current Answer
You can use fs.existsSync():
const fs = require("fs"); // Or `import fs from "fs";` with ESM
if (fs.existsSync(path)) {
// Do something
}
It was deprecated for several years, but no longer is. F...
accepting HTTPS connections with self-signed certificates
...server certificate". Are there any extra permissions that I have to set in order to make it work?
– Juriy
Feb 24 '11 at 21:59
1
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How can I extract embedded fonts from a PDF as valid font files?
...o follow a few specific steps which are not necessarily straightforward in order to save the extracted font data as a file which is re-usable.
Using mupdf
Next, MuPDF. This application comes with a utility called pdfextract (on Windows: pdfextract.exe) which can extract fonts and images from PDFs. ...