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How to test if parameters exist in rails
...n't part of the documented API, but I'm sure that's safe enough. I've been calling params.to_h.key? for now.
– stephen.hanson
Nov 9 '16 at 19:38
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How to kill all processes matching a name?
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you can also add another grep call to filter out grep (I find this easier to read/remember) ps aux | grep -ie amarok | grep -v grep | awk '{print $2}' | xargs kill -9 (grep -v stands for grep --invert)
– driftcatcher
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How to interpolate variables in strings in JavaScript, without concatenation?
...ge a or b value. console.log(Fifteen is ${a + b}.); does not changed dynamically. it always shows Fifteen is 15.
– Dharan
May 9 '19 at 5:16
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PHP - Get bool to echo false when false
...ther option is modifying the Zend engine, and one would be hard-pressed to call that a "better way".
Edit:
If you really wanted to, you could use an array:
$boolarray = Array(false => 'false', true => 'true');
echo $boolarray[false];
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Format Float to n decimal places
...is discouraged. The javadoc for this class states:
In general, do not call the DecimalFormat constructors directly, since the NumberFormat factory methods may return subclasses other than DecimalFormat.
https://docs.oracle.com/javase/8/docs/api/java/text/DecimalFormat.html
So what you need t...
Regex Match all characters between two strings
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@AwQiruiGuo same as above. [\s\S]*? (also called: non-greedy wildcard)
– phil294
Apr 9 '16 at 16:54
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How can I let a table's body scroll but keep its head fixed in place?
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unfortunately, this method fails when you have a wide table (horizontal scroll). You'll have two horizontal scrollbars; one for the header and one for the data.
– vol7ron
Aug 18 '11 at 21:41
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List files by last edited date
...g this at the prompt and want to see the most recently modified files, consider ls -lrt[RhA]. the -r reverses the sort order, leaving recently edited stuff at the bottom of the list...
– dmckee --- ex-moderator kitten
Sep 10 '09 at 12:59
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The difference between try/catch/throw and try/catch(e)/throw e
...e) { ... }
are similar in that both will catch every exception thrown inside the try block (and, unless you are simply using this to log the exceptions, should be avoided). Now look at these:
try { ... }
catch ()
{
/* ... */
throw;
}
try { ... }
catch (Exception e)
{
/* ... */
th...
What is the difference between save and export in Docker?
...th containers, while the other works with images.
An image has to be considered as 'dead' or immutable, starting 0 or 1000 containers from it won't alter a single byte. That's why I made a comparison with a system install ISO earlier. It's maybe even closer to a live-CD.
A container "boots" the im...