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Difference between reduce and foldLeft/fold in functional programming (particularly Scala and Scala
Why do Scala and frameworks like Spark and Scalding have both reduce and foldLeft ? So then what's the difference between reduce and fold ?
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Trust Store vs Key Store - creating with keytool
...blic keys (and represents the list of trusted parties you intend to communicate with). Well, that's my first assumption, so if that's not correct, I probably haven't started very well...
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Does the C++ standard mandate poor performance for iostreams, or am I just dealing with a poor imple
...wering the specifics of your question so much as the title: the 2006 Technical Report on C++ Performance has an interesting section on IOStreams (p.68). Most relevant to your question is in Section 6.1.2 ("Execution Speed"):
Since certain aspects of IOStreams processing are
distributed over mu...
How to convert a number to string and vice versa in C++
...ert it to a number. If no valid number could be constructed, for example because there is no numeric data or the number is out-of-range for the type, an exception is thrown (std::invalid_argument or std::out_of_range).
If conversion succeeded and idx is not 0, idx will contain the index of the firs...
What's the best way to communicate between view controllers?
...e page 10 of the Stanford presentation for an example of how to programmatically push a controller onto the navigation controller. For an example of how to do this "visually" using Interface Builder, take a look at this tutorial.
Third, and perhaps most importantly, note that the "best practices" m...
How to limit setAccessible to only “legitimate” uses?
...flect.AccessibleObject.setAccessible , the more astonished I am at what it can do. This is adapted from my answer to the question ( Using reflection to change static final File.separatorChar for unit testing ).
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What are the differences between local branch, local tracking branch, remote branch and remote track
...st started using Git and I got really confused between different branches. Can anyone help me to figure out what the following branch types are?
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C# Ignore certificate errors?
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Add a certificate validation handler. Returning true will allow ignoring the validation error:
ServicePointManager
.ServerCertificateValidationCallback +=
(sender, cert, chain, sslPolicyErrors) => true;
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boost::flat_map and its performance compared to map and unordered_map
It is common knowledge in programming that memory locality improves performance a lot due to cache hits. I recently found out about boost::flat_map which is a vector based implementation of a map. It doesn't seem to be nearly as popular as your typical map / unordered_map so I haven't been able ...
How do you sort an array on multiple columns?
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If owner names differ, sort by them. Otherwise, use publication name for tiebreaker.
function mysortfunction(a, b) {
var o1 = a[3].toLowerCase();
var o2 = b[3].toLowerCase();
var p1 = a[1].toLowerCase();
var p2 = b[1].toLowerCase();
if (o1 < o2) return -1;
if (o1...