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Can someone explain the traverse function in Haskell?
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traverse is the same as fmap, except that it also allows you to run effects while you're rebuilding the data structure.
Take a look at the example from the Data.Traversable documentation.
data Tree a = Empty | Leaf a | Node (Tree a) a (Tree a)
The Functor instance of Tr...
Extract month and year from a zoo::yearmon object
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Ha thank you for this answer. It especially beats the other solutions when you want to do something like if(year(date1) > 2014){year(date1) <- year(date1) - 100}
– Vincent
Feb 10 '14 at 9:34
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What is a callback function?
What is a callback function?
21 Answers
21
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ng-app vs. data-ng-app, what is the difference?
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It seems like such a waste of CPU cycles to manually strip off data- and x-. Why can't the HTML validation rules be changed to accept ng- stuff?
– DaveAlger
May 13 '15 at 14:43
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UITableView load more when scrolling to bottom like Facebook application
...thIdentifier:cellIdentifier];
if (!cell)
{
cell = [[MyCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:MainMenuCellIdentifier];
}
MyData *data = [self.dataArray objectAtIndex:indexPath.row];
// Do your cell customisation
// cell.titleLabel.text =...
Android Use Done button on Keyboard to click button
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You can use this one also (sets a special listener to be called when an action is performed on the EditText), it works both for DONE and RETURN:
max.setOnEditorActionListener(new OnEditorActionListener() {
@Override
public boolean onEditorAction(TextView v, int acti...
How do I use reflection to invoke a private method?
There are a group of private methods in my class, and I need to call one dynamically based on an input value. Both the invoking code and the target methods are in the same instance. The code looks like this:
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How do I pass a method as a parameter in Python
...thodToRun()
return result
obj.method2(obj.method1)
Note: I believe a __call__() method does exist, i.e. you could technically do methodToRun.__call__(), but you probably should never do so explicitly. __call__() is meant to be implemented, not to be invoked from your own code.
If you wanted me...
How to set Oracle's Java as the default Java in Ubuntu?
...of the JVM, you don't need to update your .bashrc file, it should automatically point to the new version.
If you want to set JAVA_HOME environment variables globally and at system level means use should set in /etc/environment file.
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How to keep a .NET console app running?
... a Console application that starts up some services in a separate thread. All it needs to do is wait for the user to press Ctrl+C to shut it down.
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