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How can I use functional programming in the real world? [closed]
Functional languages are good because they avoid bugs by eliminating state, but also because they can be easily parallelized automatically for you, without you having to worry about the thread count.
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How to open, read, and write from serial port in C?
...om tcgetattr. You cannot zero-out a struct termios, configure it, and then set the tty with tcsetattr. If you use the zero-out method, then you will experience unexplained intermittent failures, especially on the BSDs and OS X. "Unexplained intermittent failures" include hanging in read(3).
#includ...
How can I move a tag on a git branch to a different commit?
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Use the -f option to git tag:
-f
--force
Replace an existing tag with the given name (instead of failing)
You probably want to use -f in conjunction with -a to force-create an annotated tag instead of a non-annotated one.
Exa...
Multiprocessing: How to use Pool.map on a function defined in a class?
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I also was annoyed by restrictions on what sort of functions pool.map could accept. I wrote the following to circumvent this. It appears to work, even for recursive use of parmap.
from multiprocessing import Process, Pipe
from itertools import izip
def spawn(f):
def fu...
Bash script absolute path with OS X
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There's a realpath() C function that'll do the job, but I'm not seeing anything available on the command-line. Here's a quick and dirty replacement:
#!/bin/bash
realpath() {
[[ $1 = /* ]] && echo "$1" || echo "$PWD/${1#./}"
}
realpat...
LINQ with groupby and count
This is pretty simple but I'm at a loss:
Given this type of data set:
3 Answers
3
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Multi-project test dependencies with gradle
...Compile dependency:
dependencies {
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testCompile project(':A').sourceSets.test.output
}
Tested with Gradle 1.7.
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What guarantees are there on the run-time complexity (Big-O) of LINQ methods?
...on is O(1) instead of O(N).
Distinct, GroupBy Join, and I believe also the set-aggregation methods (Union, Intersect and Except) use hashing, so they should be close to O(N) instead of O(N²).
Contains checks for an ICollection implementation, so it may be O(1) if the underlying collection is also O...
How to read data when some numbers contain commas as thousand separator?
...First create a new class definition, then create a conversion function and set it as an "as" method using the setAs function like so:
setClass("num.with.commas")
setAs("character", "num.with.commas",
function(from) as.numeric(gsub(",", "", from) ) )
Then run read.csv like:
DF <- read...
What is the fastest or most elegant way to compute a set difference using Javascript arrays?
Let A and B be two sets. I'm looking for really fast or elegant ways to compute the set difference ( A - B or A \B , depending on your preference) between them. The two sets are stored and manipulated as Javascript arrays, as the title says.
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