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Code Golf: Collatz Conjecture
...r values only' unless $n == int $n;
#
state @next;
$next[1] //= 0; # sets $next[1] to 0 if it is undefined
#
# fill out @next until we get to a value we've already worked on
until( defined $next[$n] ){
say $n;
#
if( $n % 2 ){ # odd
$next[$n] = 3 * $n + 1;
} else { #...
Python: split a list based on a condition?
...Again, this is fine!
There might be slight performance improvements using sets, but it's a trivial difference, and I find the list comprehension far easier to read, and you don't have to worry about the order being messed up, duplicates being removed as so on.
In fact, I may go another step "backw...
How to extract one column of a csv file
... space for any line.
So using BEGIN (Execute before taking input) we can set this field to anything we want...
awk 'BEGIN {FS = ","}; {print $3}'
The above code will print the 3rd column in a csv file.
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How to write the Fibonacci Sequence?
I had originally coded the program wrongly. Instead of returning the Fibonacci numbers between a range (ie. startNumber 1, endNumber 20 should = only those numbers between 1 & 20), I have written for the program to display all Fibonacci numbers between a range (ie. startNumber 1, endNumber 20 displa...
What is “lifting” in Scala?
...nction
Remember a PartialFunction[A, B] is a function defined for some subset of the domain A (as specified by the isDefinedAt method). You can "lift" a PartialFunction[A, B] into a Function[A, Option[B]]. That is, a function defined over the whole of A but whose values are of type Option[B]
This ...
Batch file to delete files older than N days
...nt limited for daily usage (no time retention):
7daysclean.cmd
@echo off
setlocal ENABLEDELAYEDEXPANSION
set day=86400
set /a year=day*365
set /a strip=day*7
set dSource=C:\temp
call :epoch %date%
set /a slice=epoch-strip
for /f "delims=" %%f in ('dir /a-d-h-s /b /s %dSource%') do (
call :ep...
Can I convert a C# string value to an escaped string literal
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What about Regex.Escape(String) ?
Regex.Escape escapes a minimal set of characters (\, *, +, ?, |, {, [,
(,), ^, $,., #, and white space) by replacing them with their escape
codes.
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Polymorphism in C++
...ely flexible. SFINAE (see also std::enable_if) effectively allows several sets of expectations for parametric polymorphism. For example, you might encode that when the type of data you're processing has a .size() member you'll use one function, otherwise another function that doesn't need .size() ...
Using reflect, how do you set the value of a struct field?
...ields using reflect package. in particular, have not figured out how to set the field value.
2 Answers
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.NET String.Format() to add commas in thousands place for a number
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This is working but it's changing on regional settings
– saulyasar
Mar 27 '18 at 14:38
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