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What is meant by “managed” vs “unmanaged” resources in .NET?
...lightly: an "unmanaged resource" is something the garbage-collector won't know how to clean up after if it's abandoned. A short-lived object's subscription to an event from a long-lived object, for example, would be an unmanaged resource even though both objects are under the control of the garbage-...
What is /dev/null 2>&1?
...ns three files, standard input, standard output, and standard error as we know whenever a file is opened, the operating system (from kernel) returns a non-negative integer called a file descriptor. The file descriptor for these files are 0, 1, and 2, respectively.
So 2>&1 simply says redirec...
Why use @PostConstruct?
...
With @PostConstruct being removed in Java 11, how can we now handle this real world example with Java 11?
– tet
Oct 30 '18 at 9:40
...
The forked VM terminated without saying properly goodbye. VM crash or System.exit called
... This is the exact problem I was facing on my Jenkins and it's resolved now. Thanks.
– Vighnesh Pai
Nov 14 '18 at 6:26
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Read a zipped file as a pandas DataFrame
...
zip is now supported in pandas 0.18.1
– nishant
May 5 '16 at 2:16
1
...
moment.js - UTC gives wrong date
... string in the local time zone of the browser by default. I'm on EDT right now. new Date('2010-12-12') gives me Date {Sat Dec 11 2010 19:00:00 GMT-0500 (Eastern Daylight Time)} in FF 38.0.5. Just to contextualize what "in the local time" means, exactly -- in this case, it appears to mean, "Date will...
The difference between try/catch/throw and try/catch(e)/throw e
...nless you are simply using this to log the exceptions, should be avoided). Now look at these:
try { ... }
catch ()
{
/* ... */
throw;
}
try { ... }
catch (Exception e)
{
/* ... */
throw;
}
try { ... }
catch (Exception e)
{
/* ... */
throw e;
}
The first and second try-ca...
How to get the previous URL in JavaScript?
...
If you want to go to the previous page without knowing the url, you could use the new History api.
history.back(); //Go to the previous page
history.forward(); //Go to the next page in the stack
history.go(index); //Where index could be 1, -1, 56, etc.
But you can't man...
map function for objects (instead of arrays)
...ll and an extra library just for one function. In any case, this answer is now outdated and you can simply call Object.entries({a: 1, b: 2, c: 3}) to get an array.
– user6269864
Oct 3 '17 at 7:49
...
Saving grid.arrange() plot to file
...t2, plot3, nrow=3) #generates g
ggsave(file="whatever.pdf", g) #saves g
Now it works for me fine.
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