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What does “coalgebra” mean in the context of programming?
...rmation Identity → f.
Now we can think about a monad as just an algebra based around some functor f with operations f ∘ f → f and Identity → f. Doesn't this look familiar? It's very similar to a monoid, which was just some type τ with operations τ × τ → τ and () → τ.
So a monad i...
Using unset vs. setting a variable to empty
...
Based on the comments above, here is a simple test:
isunset() { [[ "${!1}" != 'x' ]] && [[ "${!1-x}" == 'x' ]] && echo 1; }
isset() { [ -z "$(isunset "$1")" ] && echo 1; }
Example:
$ unset foo; [...
Search all of Git history for a string? [duplicate]
I have a code base which I want to push to GitHub as open source. In this git-controlled source tree, I have certain configuration files which contain passwords. I made sure not to track this file and I also added it to the .gitignore file. However, I want to be absolutely positive that no sensiti...
Adjust UIButton font size to width
...
iOS 10.3 solution based on the other answers here:
button.titleLabel!.numberOfLines = 1
button.titleLabel!.adjustsFontSizeToFitWidth = true
button.titleLabel!.baselineAdjustment = .alignCenters
Nobody mentioned baselineAdjustm...
What does “opt” mean (as in the “opt” directory)? Is it an abbreviation? [closed]
...ptional add-on software packagessource, or anything that isn't part of the base system. Only some distributions use it, others simply use /usr/local.
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How to hide Soft Keyboard when activity starts
...nputMethodManager.hideSoftInputFromWindow(windowToken, 0)
}
Alternatives based on use case:
fun Fragment.hideKeyboard() {
view?.let { activity?.hideKeyboard(it) }
}
fun Activity.hideKeyboard() {
// Calls Context.hideKeyboard
hideKeyboard(currentFocus ?: View(this))
}
fun Context.hid...
Git for beginners: The definitive practical guide
... using git to track that project). Simply remove the .git directory at the base level of the repository.
cd ~/code/project001/
rm -rf .git/
Caution: This will destroy all revision history, all your tags, everything git has done. It will not touch the "current" files (the files you can currently see...
Passing Parameters JavaFX FXML
...cts into the FXMLLoader constructor, instead you:
Construct an FXMLLoader based upon fxml markup at a specified location
Get a controller from the FXMLLoader instance.
Invoke methods on the retrieved controller to provide the controller with references to the domain objects.
This blog (by another ...
Is there a command to list SVN conflicts?
...visions after the latest one you updated with.
E.g. if your current WC is based on revision 147 this could do it:
svn merge -r 148:HEAD http://url.to.repo/repo/
It's nothing I've done myself though, so you'll have to try it yourself.
...
What are transparent comparators?
... of the N3657 proposal (which was a last-minute revision by myself and STL based on N3465 and a later unpublished draft by Joaquín) was to add the is_transparent type as the protocol that can be used to opt in to the new functionality.
If you don't use a "transparent functor" (i.e. one that define...