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CSS selector for first element with class
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This is one of the most well-known examples of authors misunderstanding how :first-child works. Introduced in CSS2, the :first-child pseudo-class represents the very first child of its parent. That's it. There's a very common misconception that it picks u...
Java Singleton and Synchronization
... case where you have two threads that call getInstance() at the same time. Now imagine T1 executes just past the instance == null check, and then T2 runs. At this point in time the instance is not created or set, so T2 will pass the check and create the instance. Now imagine that execution switches ...
Can I run multiple programs in a Docker container?
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It looks like new version's of Docker now support Docker container networks.
– jpierson
Feb 24 '16 at 21:42
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Calculate RSA key fingerprint
...5 -lf <fileName>
Bonus information:
ssh-keygen -lf also works on known_hosts and authorized_keys files.
To find most public keys on Linux/Unix/OS X systems, run
$ find /etc/ssh /home/*/.ssh /Users/*/.ssh -name '*.pub' -o -name 'authorized_keys' -o -name 'known_hosts'
(If you want to se...
What is the difference between 'git pull' and 'git fetch'?
... @Tino yours is really the most important point. People may not know that "remote" branches are actually stored as a bunch of hashes in .git/refs/remotes/origin/.
– Chris
Sep 12 '13 at 21:49
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No identities were available - administrator request
... the bottom right
Click on the refresh arrow on the bottom left
Xcode will now refresh the updated credentials, and you can proceed to validate or distribute your app.
Validate or distribute your app again. It should work.
If this didn't work then go to "TEAM" under project settings > targets an...
Repeat Character N Times
...rmony, you will have native way for doing this with repeat. Also ES6 right now only experimental, this feature is already available in Edge, FF, Chrome and Safari
"abc".repeat(3) // "abcabcabc"
And surely if repeat function is not available you can use old-good Array(n + 1).join("abc")
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How to animate the change of image in an UIImageView?
I have an UIImageView with an image. Now I have a completely new image (graphic file), and want to display that in this UIImageView . If I just set
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Can comments be used in JSON?
...n the processes that generates/receives the JSON, as they are supposed to know what the JSON data will be in advance, or at least the structure of it.
But if you decided to:
{
"_comment": "comment text goes here...",
"glossary": {
"title": "example glossary",
"GlossDiv": {
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Generate random int value from 3 to 6
... AS TINYINT)
And that was taken directly from this link, I don't really know how to give proper credit for this answer.
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