traversal

A Foldable instance is likely to be some sort of container, and so is likely to be a Functor as well. Indeed, this says A Foldable type is also a container (although the class does not technically require Functor , interesting Foldable s are all Functor s). So is there an example of a Foldable which is not naturally a Functor or a Traversable ? (which perhaps the Haskell wiki page missed :-) ) Sjoerd Visscher Here's a fully parametric example: data Weird a = Weird a (a -> a) instance Foldable Weird where foldMap f (Weird a b) = f $ b a Weird is not a Functor because a occurs in a negative

How can I traverse (read all the nodes in order) a XML document using recursive functions in c#? What I want is to read all the nodes in xml (which has attributes) and print them in the same structure as xml (but without Node Localname) Thanks using System.Xml; namespace ConsoleApplication1 { class Program { static void Main( string[] args ) { var doc = new XmlDocument(); // Load xml document. TraverseNodes( doc.ChildNodes ); } private static void TraverseNodes( XmlNodeList nodes ) { foreach( XmlNode node in nodes ) { // Do something with the node. TraverseNodes( node.ChildNodes ); } } } }

Given I have an array of "purpose" objects: //array of purpose objects: var purposeObjects = [ {purpose: "daily"}, {purpose: "weekly"}, {purpose: "monthly"} ]; (for simplicity i am omitting other attributes) Now I want to have a method that returns a specific one of the objects if a matching purpose name is found. This is not working: function findPurpose(purposeName){ return $.grep(purposeObjects, function(){ return this.purpose == purposeName; }); }; findPurpose("daily"); but it actually returns an empty array: [] I am using JQuery 1.5.2. I have also tried with $.each() but with no luck.

I'm trying to find a way to return the value of an array's parent key. For example, from the array below I'd like to find out the parent's key where $array['id'] == "0002". The parent key is obvious because it's defined here (it would be 'products'), but normally it'd be dynamic, hence the problem. The 'id' and value of 'id' is known though. [0] => Array ( [data] => [id] => 0000 [name] => Swirl [categories] => Array ( [0] => Array ( [id] => 0001 [name] => Whirl [products] => Array ( [0] => Array ( [id] => 0002 [filename] => 1.jpg ) [1] => Array ( [id] => 0003 [filename] => 2.jpg ) ) ) ) ) A

I know individual attributes can be retrieved with the attr() method, but I'm trying to iterate over all of the attributes for an element. For context, I'm using jQuery on some XML... <items> <item id="id123" name="Fizz" value="Buzz" type="xyz"> <subitem name="foo"> <subitem name="bar"> </item> <item id="id456" name="Bizz" value="Bazz" type="abc"> <subitem name="meh"> <subitem name="hem"> </item> </items> I am already able to iterate over the items with... $(xml).find('item').each(function() { // Do something to each item here... }); But I'd like to be able to get an array of attributes for

I'm trying to get all the DOM nodes that are within a range object, what's the best way to do this? var selection = window.getSelection(); //what the user has selected var range = selection.getRangeAt(0); //the first range of the selection var startNode = range.startContainer; var endNode = range.endContainer; var allNodes = /*insert magic*/; I've been been thinking of a way for the last few hours and came up with this: var getNextNode = function(node, skipChildren){ //if there are child nodes and we didn't come from a child node if (node.firstChild && !skipChildren) { return node.firstChild;