detect

Select makes sense. But can someone explain .detect to me? I don't understand these data. >> [1,2,3,4,5,6,7].detect { |x| x.between?(3,4) } => 3 >> [1,2,3,4,5,6,7].detect { |x| x.between?(3,6) } => 3 >> [1,2,3,4,5,6,7].detect { |x| x.between?(3,7) } => 3 >> [1,2,3,4,5,6,7].detect { |x| x.between?(2,7) } => 2 >> [1,2,3,4,5,6,7].detect { |x| x.between?(1,7) } => 1 >> [1,2,3,4,5,6,7].detect { |x| x.between?(6,7) } => 6 >> [1,2,3,4,5,6,7].select { |x| x.between?(6,7) } => [6, 7] >> [1,2,3,4,5,6,7].select { |x| x.between?(1,7) } => [1, 2, 3, 4, 5, 6, 7] Detect returns the first item in the list for

How can I detect when a UITableView has been scrolled to the bottom so that the last cell is visible? Implement the tableView:willDisplayCell:forRowAtIndexPath: method in your UITableViewDelegate and check to see if it's the last row. Inside tableView:cellForRowAtIndexPath: or tableView:willDisplayCell:forRowAtIndexPath: like this: - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { ... NSInteger sectionsAmount = [tableView numberOfSections]; NSInteger rowsAmount = [tableView numberOfRowsInSection:[indexPath section]]; if ([indexPath section

im making a website (wordpress multisite) which is supported by 2 languages for users, there 2 methods we will use it one: -Detect language by Geo IP -Detect Language by Internet Browser Which is the best method to use it? Thanks in Advance! If I were you I'd follow this list: If the user is a registered user, set the language according to his/her preferences If the user has been on the site before, using language X, use that (store the language option in a cookie). If the http header Accept-Language is present, try to make use of it (you obviously don't support all the languages in the world)

I'm struggling to find out how to detect when a div with position fixed start and finish to hover a certain div while scrolling. I've a div always in position fixed and centered in my window. While I'm scrolling my page, I would like that the fixed div when starts to hover another one changes its color and remove the color once it finishes to hover. I attached a little schema to illustrate my problem. To resume: The fixed div when page loads has black color -> Starts to hover a second div, the color turns to white -> Finish to hover the second div, the color is back to black. I found this

Is it possible to detect a mouse click anywhere on a screen, outside of my application? I have written an application to do this in C#, but would like to write a version of this in Java so that it can be run on several platforms. It looks like I can get the co-ordinates of the mouse at any time with java.awt.MouseInfo.getPointerInfo() but I am not sure as to how to listen for a mouse click. In C# I used GetAsyncKeyState to detect whether the mouse button was clicked, but obviously I cannot use this if I wish to keep this "clean" for use in multiple platforms. You can do this only with platform

I have a doodle application that saves an html5 canvas to an image in s3. I want to avoid saving blank (totally transparent) pngs if the user accidentally clicks "save" without having drawn anything. I found that even for a blank canvas the toDataURL() is never an empty string, but huge dump of data. This string appears to always remain the same value if no data is added to the canvas. So one way of detecting an empty canvas is to compare the submitted canvas data to this empty canvas data string to see if they match. My question is, is there a more efficient way of doing this? Doing a string

I'm new to using the Facebook SDK and I wondered how detect when the user deletes the app from his Facebook account. Currently if we delete the app, and we want to post something from my app, I'm getting an error message. Try this: [FBSession renewSystemCredentials:^(ACAccountCredentialRenewResult result, NSError *error) { if (!error) { if (result == ACAccountCredentialRenewResultRejected) { NSLog(@"Facebook app deleted"); } } else { NSLog(@"Error: %@", error); } }]; http://developers.facebook.com/docs/authentication/#app-deauthorization https://developers.facebook.com/apps/ go to your app's

I'm trying to create a Python script that detects holes, ends and beginnings of a line. I thought that openCV would be great to achieve this. So for example everything starts with this image: finally what I want to achieve is this: So I began with importing the image into Python and converting it in grayscale. Now I came to the idea to track the holes by using the goodFeaturesToTrack() method. It's normally used to find corners in the image. However that didn't work so well because after that the script knows the points, but it doesn't know if a point is from a hole or if it's the beginning or