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How to append rows to an R data frame
...). The next-best solution is to use list, and the worst solution (at least based on these timing results) appears to be rbind.
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Efficiency of purely functional programming
... translated to an algorithm in the pure Lisp that runs in O(n log n) time (based on work by Ben-Amram and Galil [1992] about simulating random access memory using only pointers). Pippenger also establishes that there are algorithms for which that is the best you can do; there are problems which are ...
Why switch is faster than if
...tter than a long list of if-else statements as switch can perform a lookup based on all the values. However, for a short condition it won't be any faster and could be slower.
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How to trace the path in a Breadth-First Search?
... queue.append(adjacent)
print bfs(graph, '1', '11')
The above codes are based on the assumption that there's no cycles.
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In git how is fetch different than pull and how is merge different than rebase?
...the pulled branch. A fetch does not advance your local branch.
merge vs rebase
Given the following history:
C---D---E local
/
A---B---F---G remote
merge joins two development histories together. It does this by replaying the changes that occurred on your local branch aft...
How do I decode a string with escaped unicode?
...is deprecated and doesn't work with the TypeScript compiler, for example.
Based on radicand's answer and the comments section below, here's an updated solution:
var string = "http\\u00253A\\u00252F\\u00252Fexample.com";
decodeURIComponent(JSON.parse('"' + string.replace(/\"/g, '\\"') + '"'));
ht...
Where to use EJB 3.1 and CDI?
I am making a Java EE based product in which I'm using GlassFish 3 and EJB 3.1.
2 Answers
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Should I use Java date and time classes or go with a 3rd party library like Joda Time?
I'm creating a web based system which will be used in countries from all over the world. One type of data which must be stored is dates and times.
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Why / when would it be appropriate to override ToString?
...r can display, the debugging experience is hindered.
DO string formatting based on the current thread culture when returning culture-dependent information.
DO provide overload ToString(string format), or implement IFormattable, if the string return from ToString is culture-sensitive or there are v...
MongoDB with redis
...collections cannot really be used to implement a real TTL. Redis has a TTL-based expiration mechanism, making it convenient to store volatile data. For instance, user sessions are commonly stored in Redis, while user data will be stored and indexed in MongoDB. Note that MongoDB 2.2 has introduced a ...