Haskell - “How can I use ”if“ statement in ”do\" block properly? [duplicate]

Haskell - “How can I use ”if“ statement in ”do\" block properly? [duplicate]

Possible Duplicate: Haskell “do nothing” IO, or if without else Something got wrong in these "easy" lines ...action = do isdir GHCi will complaint about identifiers , or do not exec the last line action after I add else do

onNavigationItemSelected in ActionBar is being called at startup how can avoid it?

onNavigationItemSelected in ActionBar is being called at startup how can avoid it?

I am using ActionBar with a dropdown menu, and onNavigationItemSelected() is called as soon as the Activity is created, so the first item is called. The first item of my dropdown menu is Home, the same action as pressing the application ico

Paperclip Error: model missing required attr_accessor for 'avatar_file_name'

Paperclip Error: model missing required attr_accessor for 'avatar_file_name'

I then want to use Paperclip to have photos for each Listing. I added the appropriate code to the listings show.html.erb, the listing.rb model, the listings_controller.rb and the _form.html.erb partial. When I try uploading an image for the

How come request.getPathInfo() in service method returns null?

How come request.getPathInfo() in service method returns null?

I wrote Front Controller Pattern and ran the test. Somehow request.getPathInfo() is returning null when it should return the path info.1. HTML that calls servletTest link to invoke cool servlet2. Map the servlet in DD.Anything that has .do

My Logo doesn't display at the correct position in actionbar

My Logo doesn't display at the correct position in actionbar

I wrote this code into my Activity and my logo displays, but it has a space before the logogetSupportActionBar().setDisplayUseLogoEnabled(true); getSupportActionBar().setDisplayShowHomeEnabled(true); getSupportActionBar().setIcon(R.dr

How do I launch the email client directly to inbox view?

How do I launch the email client directly to inbox view?

Is this even possible without calling a specific package? I have found countless examples of sending email via intent, but I can find nothing about simply opening the default email client on the device via button press (preferably with a c

Android: Dynamically asscociating data type with an activity

Android: Dynamically asscociating data type with an activity

I have a use case in my application, where after certain point, I need to associate an data with an activity. So whenever an intent with an action and the data type is fired, my activity can be opened. I know that it is possible to associat

Setting image background in SurfaceView, getting black screen

Setting image background in SurfaceView, getting black screen

Okay so Im trying to set the background of a SurfaceView to a JPG file. But it doesn't seem to want to draw the image, and all I get is a black screen.Here:s my code: public class FloorplanActivity extends Activity{@Overrideprotected voi

android enable disable bluetooth via command line

android enable disable bluetooth via command line

I am trying to enable disable bluetooth on android device using command line.I can enable it using adb shell am start -a android.bluetooth.adapter.action.REQUEST_ENABLEBut it prompts user to 'allow' or 'deny'.I also see there is option to l

how to use Immutability helper to update a nested object within an array?

how to use Immutability helper to update a nested object within an array?

Inside reducer, given a state object:var state = { "data": [{ "subset": [{ "id": 1 }, { "id": 2 }] }, { "subset": [{ "id": 10

Sturts 2 session invalidation with setting request session to a new session

Sturts 2 session invalidation with setting request session to a new session

In my Struts application once an user login I need to invalidate the current session and create a new session. I invalidate the session withgetHttpServletRequest().getSession().invalidate();And I create a new session as getHttpServletReques

How to get image URL property from Wikidata item by API?

How to get image URL property from Wikidata item by API?

I've made an android app that uses the JSON Google image search API to provide images but I have noticed that Google have stopped supporting it. I have also discovered that Wikidata sometimes provides a image property on some items, however

Why does removeeventlistener not work in this object context?

Why does removeeventlistener not work in this object context?

I am working on a game and I would like to abstract my ui, and bind unbind events based on various game states. But I can't figure out why this event is not being removed. It seems the scope is correct in the handler.fiddlerelevant (strippe

Passing data between classes using Objective-C

Passing data between classes using Objective-C

I need some info about how to pass data between classes.. To be specific, I want to store in a class in an array some info, (using model store class), and then use it in another class.. 1:I've posted some alternatives to the delegate pa

How to display a local image via adb shell

How to display a local image via adb shell

I am trying to display a local image on my Samsung Note 3 via adb shell. $adb shell am start -a android.intent.action.VIEW -n com.android.browser/.BrowserActivity -d file:///storage/emulated/legacy/Pictures/red.png $ this code works for

How to display all available Struts2 actions?

How to display all available Struts2 actions?

I'm quite frequently asked to solve struts.xml configuration errors. Now, after updating to a later version of Struts2 I myself run into such a mismatch. Resulting in the following error:No result defined for action com.opensource.project.R

Turn SSL verification off for JGit clone command

Turn SSL verification off for JGit clone command

I am trying to a clone of a Git Repository via the CloneCommand.With this piece of code`Git.cloneRepository().setDirectory(new File(path)).setURI(url).call();`The remote repository is on a GitBlit Instance which uses self signed certificate

Play slick and Async - is it a race condition?

Play slick and Async - is it a race condition?

Reading Play-Slick DBAction code, I thought that this code might contain a race condition:object DBAction{ // snip def apply(r: (RequestWithDbSession) => Result)(implicit app:Application) = { Action { implicit request => AsyncRes

Intellij exclude file from being compiled

Intellij exclude file from being compiled

I am trying to exclude a particular file in my project from being compiled.According to the Intellij IDEA documentation you do this by "marking the file as plain text".However, the context menu in the project view where this functionality i

Return List from view to controller in MVC 3

Return List from view to controller in MVC 3

I currently have an object Tag defined as follows:public class Tag{ public string Name { get; set; }}Now, this is a collection property of a Model which I'm defining as:public class MyModel{ public string Name { get; set; } public

AppWidget PendingIntent not working after Launcher restart

AppWidget PendingIntent not working after Launcher restart

I have an AppWidget with 2 pending intents. They work most of the time, but after a while they stop responding. Only thing I have been able to pinpoint is that they are crippled after a Launcher restart, i.e. I use Launcher Pro, and sometim

Passing Data to a Layout Page

Passing Data to a Layout Page

I have a layout page that has variables that need to be filled. Example: @ModelType KarateAqua.schoolModel @RenderBody() @Model.schoolName

How to retrieve data from Wikipedia API using JSON?

How to retrieve data from Wikipedia API using JSON?

Here I am fetching the data from Wikipedia using following code. but it is not working for me.var playListURL = 'http://en.wikipedia.org/w/api.php?format=json&action=query&titles=India&prop=revisions&rvprop=content&callback=?';$.getJSON(pla

Render Partial to String in the Controller or elsewhere

Render Partial to String in the Controller or elsewhere

So basically I have a partial view which can build a nice table for me. I would like to email this table out every week to my users. Instead of having to basically copy the template again, I would like to forward my model to the controller

ASP.NET MVC Model Binding into a List

ASP.NET MVC Model Binding into a List

In my ASP.NET MVC site, part of a feature allows the user to enter the hours when a certain venue is open.I've decided to store these hours in a VenueHours table in my database, with a FK-to-PK relationship to a Venues table, as well as Day