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Abusing the algebra of algebraic data types - why does this work?
...oint strikingly. You mentioned in a comment that for a tree type T = 1 + T^2 you can derive the identity T^6 = 1, which is clearly wrong. However, T^7 = T does hold, and a bijection between trees and seven-tuples of trees can be constructed directly, cf. Andreas Blass's "Seven Trees in One".
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Adding days to $Date in PHP
I have a date returned as part of a mySQL query in the form 2010-09-17
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How can I repeat a character in Bash?
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Can't compile project when I'm using Lombok under IntelliJ IDEA
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How to maximize the browser window in Selenium WebDriver (Selenium 2) using C#?
Is there any way to maximize the browser window using WebDriver (Selenium 2) with C#?
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How can I configure the font size for the tree item in the package explorer in Eclipse?
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Safe (bounds-checked) array lookup in Swift, through optional bindings?
...ned to stumble on a nicer way of implementing this functionality:
Swift 3.2 and newer
extension Collection {
/// Returns the element at the specified index if it is within bounds, otherwise nil.
subscript (safe index: Index) -> Element? {
return indices.contains(index) ? self[i...
Python argparse mutual exclusive group
... | [-b yyy -c zzz]], you'd have:
prog
command 1
-a: ...
command 2
-b: ...
-c: ...
To invoke with the first set of arguments:
prog command_1 -a xxxx
To invoke with the second set of arguments:
prog command_2 -b yyyy -c zzzz
You can also set the sub command arguments as posi...
How do I install jmeter on a Mac?
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The easiest way to install it is using Homebrew:
brew install jmeter
Or if you need plugins...
PHP: How to remove specific element from an array?
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