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What is the purpose of setting a key in data.table?
...o be set on x. With the new on= argument from v1.9.6+, this is not true anymore, and setting keys is therefore not an absolute requirement here as well.
## joins using < v1.9.6
setkey(X, a) # absolutely required
setkey(Y, a) # not absolutely required as long as 'a' is the first column
X[Y]
##...
Difference between jQTouch and jQuery mobile
...what I've come up with so far:
jQuery Mobile is an offical and generally more active jQuery project (alpha 4.1 - April 7, 2011) whereas jQTouch, created in 2009 by David Kaneda, has been relatively quiet until release of beta 3 (May 3, 2011)
jQTouch is a jQuery plugin (see "Staying on jQuery" sect...
What are some better ways to avoid the do-while(0); hack in C++?
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Why doesn't RecyclerView have onItemClickListener()?
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Think of Recyclerview not as a ListView 1:1 replacement but rather as a more flexible component for complex use cases. And as you say, your solution is what google expected of you. Now you have an adapter who can delegate onClick to an interface passed on the constructor, which is the correct pat...
How to store int[] array in application Settings
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Could not open a connection to your authentication agent
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Proper stack and heap usage in C++?
... Sure, and new/malloc() is itself a slow operation, and stack is more likely to be in dcache than an arbitrary heap line. These are real considerations, but usually secondary to the question of lifespan.
– Crashworks
Mar 1 '09 at 9:42
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What is the best way to give a C# auto-property an initial value?
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subtle differences between JavaScript and Lua [closed]
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Some more differences:
Lua has native support for coroutines.
UPDATE: JS now contains the yield keyword inside generators, giving it support for coroutines.
Lua doesn't convert between types for any comparison operators. In J...
Listing each branch and its last revision's date in Git
...s cleaner. And faster.
See also "Name only option for git branch --list?"
More generally, tripleee reminds us in the comments:
Prefer modern $(command substitution) syntax over obsolescent backtick syntax.
(I illustrated that point in 2014 with "What is the difference between $(command...