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Difference between reduce and foldLeft/fold in functional programming (particularly Scala and Scala
..., 4).sortBy(identity[String])
require(rdd.collect.sliding(2).forall { case Array(x, y) => x < y })
/* Note: all posible permutations */
require(Seq.fill(1000)(rdd.fold("")(_ + _)).toSet.size == 24)
Explained:
Structure of fold for RDD
def fold(zeroValue: T)(op: (T, T) => T): T = withSc...
Sending event when AngularJS finished loading
... is ready, call angular.bootstrap with the root element of your app and an array of module names.
In fact, if you attach a run function to the app module, you'll see it gets run before any of the compiling takes place.
If you run the fiddle and watch the console, you'll see the following:
before ...
Using a piano keyboard as a computer keyboard [closed]
...
Note that you could jam all the chords in a linear array and do traversal every time you receive a midi event, and still not experience any noticable slowdown. Using a trie smells slightly of premature optimization.
– FeepingCreature
Jan...
Why does C++ not have reflection?
...ct can be optimized away.
operator[] on a vector is only comparable to raw
array indexing in performance
because the entire operator can be
inlined and thus removed entirely
from the compiled code. C# and Java
make a lot of guarantees about the
output of the compiler. If I define
a class in C#, then...
Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_
I was looking for the fastest way to popcount large arrays of data. I encountered a very weird effect: Changing the loop variable from unsigned to uint64_t made the performance drop by 50% on my PC.
...
What is a mixin, and why are they useful?
...at doesn't know anything about your original type, accepting only, say, an array of XmlSerializable types.
Now imagine using this scenario for other things, like creating a mixin that ensures that every class that mixes it in logs every method call, or a mixin that provides transactionality to the...
Rebasing a branch including all its children
...ANCH
fi
check_ref_existence
# These three depend on the pairs array
if [ -z "$continue" ]; then
create_pre_refs
fi
perform_rebases
echo "Returning to original branch"
if [ -n "$dry_run" ]; then
echo git checkout $(cat $ORIGINAL_BRANCH)
else
...
How can I determine whether a 2D Point is within a Polygon?
...at the end has been discussed in the article referred above.
vertx, verty: Arrays containing the x- and y-coordinates of the polygon's vertices.
testx, testy: X- and y-coordinate of the test point.
It's both short and efficient and works both for convex and concave polygons. As suggested before, y...
How to convert number to words in java
...ave a crude mechanism to convert numbers to words (e.g. using a few static arrays) and based on the size of the number translating that into an english text. But we are running into issues for numbers which are huge.
...
What is an optional value in Swift?
...thod which can return a value or nothing, like searching for a match in an array
A method which can return either a result or get an error and return nothing, like trying to read a file's contents (which normally returns the file's data) but the file doesn't exist
Delegate properties, which don't al...