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After array_filter(), how can I reset the keys to go in numerical order starting at 0
...ray_filter to remove entries that had only the value '' from an array, and now I want to apply certain transformations on it depending on the placeholder starting from 0, but unfortunately it still retains the original index. I looked for a while and couldn't see anything, perhaps I just missed the...
Does Python optimize tail recursion?
...ons.
The clean way: modifying the Y combinator
The Y combinator is well known; it allows to use lambda functions in a recursive
manner, but it doesn't allow by itself to embed recursive calls in a loop. Lambda
calculus alone can't do such a thing. A slight change in the Y combinator however
can pr...
Assign multiple columns using := in data.table, by group
...
This now works in v1.8.3 on R-Forge. Thanks for highlighting it!
x <- data.table(a = 1:3, b = 1:6)
f <- function(x) {list("hi", "hello")}
x[ , c("col1", "col2") := f(), by = a][]
# a b col1 col2
# 1: 1 1 hi hello
# ...
How to keep the local file or the remote file during merge using Git and the command line?
I know how to merge modification using vimdiff, but, assuming I just know that the entire file is good to keep or to throw away, how do I do that?
...
Function passed as template argument
...cout << "Result is " << temp << std::endl;
}
which can now be called as either:
doOperation(add2);
doOperation(add3());
See it live
The problem with this is that if it makes it tricky for the compiler to inline the call to add2, since all the compiler knows is that a function...
Android activity life cycle - what are all these methods for?
...ties are considered active or running if they are in the foreground, also known as the top of the activity stack. This is considered the highest priority activity in the Android Activity stack, and as such will only be killed by the OS in extreme situations, such as if the activity tries to use more...
Convert List to List
... covariant conversions on interfaces and delegates when the conversion is known to be always safe. See my blog articles on covariance and contravariance for details. (There will be a fresh one on this topic on both Monday and Thursday of this week.)
...
CSS for grabbing cursors (drag & drop)
... I saw the move icon, thought the grab icon was better. But now that you pointed out w3c considers that cursor "Indicates something is to be moved," it makes the most sense. Thanks.
– at.
Apr 18 '11 at 7:05
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Allow CORS REST request to a Express/Node.js application on Heroku
...at works for requests from the js console in Chrome, and URL bar, etc. I'm now trying to get it working for requests from another app, on a different domain (CORS).
...
Twitter API returns error 215, Bad Authentication Data
...ontent_type = 'application/x-www-form-urlencoded';
The first 2 lines are now documented in Abraham library Readme file, but the 3rd one is not. Also make sure that your oauth_version is still 1.0.
Here is my code for getting all user data from 'users/show' with a newly authenticated user and ret...