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Get current date/time in seconds
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@Nick - I think all examples are necessarily speculative and will sound contrived - but I'll take a shot :) Suppose you have data time stamped with unix time, and want to determine it's age. More though I think this is what is most likely me...
Android studio Gradle build speed up
...use gradle from the command line and you should switch to binary libs for all modules you do not develop. On g+ there is a discussion with the developers about it.
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How to get the unique ID of an object which overrides hashCode()?
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Uniqueness isn't guaranteed at all ... for a practical JVM implementation. Guaranteed uniqueness requires either no relocation / compaction by the GC, or a big and expensive data structure for managing the hashcode values of live objects.
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ExecJS and could not find a JavaScript runtime
... cannot find a JavaScript runtime. Fair enough when I didn't have any installed, but I've tried installing Node.js , Mustang and the Ruby Racer , but nothing is working.
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How to initialize List object in Java?
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If you check that link, you'll find some classes that implement List:
All Known Implementing Classes:
AbstractList, AbstractSequentialList, ArrayList, AttributeList, CopyOnWriteArrayList, LinkedList, RoleList, RoleUnresolvedList, Stack, Vector
Those can be instantiated. Use their links t...
How can I detect if a selector returns null?
...Why did you wrap 'this' inside a $() ? wouldn't 'this' in this context actually point to jQuery object ?
– Adham Atta
Mar 28 '11 at 11:25
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Key existence check in HashMap
...than getting the value. So it won't optimize anything to check the key actually exists before getting the value. I know it's a generalization but it can help to understand.
– Colin Hebert
Sep 2 '10 at 12:42
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Extracting specific columns from a data frame
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Using the dplyr package, if your data.frame is called df1:
library(dplyr)
df1 %>%
select(A, B, E)
This can also be written without the %>% pipe as:
select(df1, A, B, E)
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Qt: can't find -lGL error
I just reinstalled QtCreator, created new project ( Qt Application ) an got this after compilation:
8 Answers
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How to add a downloaded .box file to Vagrant?
...hing in the Vagrantfile. I am just using the Vagrantfile that got automatically created upon vagrant init. When i cat Vagrantfile, I don't see anything called a password or pem or anything
– Rakib
Sep 15 '15 at 12:31
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