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List comprehension vs. lambda + filter
...yself having a basic filtering need: I have a list and I have to filter it by an attribute of the items.
14 Answers
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What is the best way to trigger onchange event in react js
...igger sets on the element.value. You can bail out of
this logic secretly by tagging the event you trigger with a simulated
flag and react will always fire the event.
https://github.com/jquense/react/blob/9a93af4411a8e880bbc05392ccf2b195c97502d1/src/renderers/dom/client/eventPlugins/ChangeEvent...
Message Queue vs. Web Services? [closed]
...rsisted.
You have contention, you can decide how many requests are handled by the server (call it worker instead).
You don't expect an immediate synchronous response, but you can implement/simulate synchronous calls.
Message Queues has a lot more features but this is some rule of thumb to decide i...
Test if a command outputs an empty string
...ds don’t return values – they output them. You can capture this output by using command substitution; e.g. $(ls -A). You can test for a non-empty string in Bash like this:
if [[ $(ls -A) ]]; then
echo "there are files"
else
echo "no files found"
fi
Note that I've used -A rather than -...
Where can I find the TypeScript version installed in Visual Studio?
...ons 1.0, 1.8 and 2.2:
B. Check which version of Typescript is requested by your project. In *.csproj file, look for <TypeScriptToolsVersion> tag, or you can add it if it is missing, like this
<PropertyGroup>
...
<TypeScriptToolsVersion>1.8</TypeScriptTo...
Postgresql - unable to drop database because of some auto connections to DB
... I try to drop database I get:
ERROR: database "pilot" is being accessed by other users
DETAIL: There is 1 other session using the database.
First You need to revoke
REVOKE CONNECT ON DATABASE TARGET_DB FROM public;
Then use:
SELECT pg_terminate_backend(pg_stat_activity.pid)
FROM pg_stat_ac...
:after vs. ::after
...at the issue of support for (at least this) CSS3 tag is almost a non-issue by now.
– DRosenfeld
Feb 25 '16 at 12:06
1
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Calculate RSA key fingerprint
...For example:
ssh-keygen -lf ~/.ssh/id_dsa.pub
1024 SHA256:19n6fkdz0qqmowiBy6XEaA87EuG/jgWUr44ZSBhJl6Y (DSA)
If you need to compare it against an old fingerprint you also need to specify to use the MD5 fingerprint hashing function.
ssh-keygen -E md5 -lf ~/.ssh/id_dsa.pub
2048 MD5:4d:5b:97:19:8c:...
Nginx not picking up site in sites-enabled?
...t certain versions of nginx allows including/linking to other files purely by having a single line with the relative path to the included file. (At least that's what it looked like in some "inherited" config files I've been using, until a new nginx version broke them.)
In sites-enabled/default (old...
Interface or an Abstract Class: which one to use?
...approach that's common when you're uncertain which way to go (as mentioned by cletus below) is to create an interface, and then have your abstract class implement that interface.
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