Ruby ampersand colon shortcut [duplicate]

Ruby ampersand colon shortcut [duplicate]

Possible Duplicate: What does map(&:name) mean in Ruby? In Ruby, I know that if I do:some_objects.each(&:foo)It's the same assome_objects.each { |obj| obj.foo }That is, &:foo creates the block { |obj| obj.foo }, turns it into a Proc, and

Detecting which UIButton was pressed in a UITableView

Detecting which UIButton was pressed in a UITableView

I have a UITableView with 5 UITableViewCells. Each cell contains a UIButton which is set up as follows:- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{ NSString *identifier = @"iden

javafx 8 compatibility issues - FXML static fields

javafx 8 compatibility issues - FXML static fields

I have designed a javafx application which works fine in jdk 7. When I try to run it in java 8 I am getting the below exceptions:javafx.fxml.LoadException: at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2617) at javafx.

Why is this string reversal C code causing a segmentation fault? [duplicate]

Why is this string reversal C code causing a segmentation fault? [duplicate]

This question already has an answer here: Why do I get a segmentation fault when writing to a string initialized with “char *s” but not “char s[]”? 16 answers

When do you use the “this” keyword? [closed]

When do you use the “this” keyword? [closed]

I was curious about how other people use the this keyword. I tend to use it in constructors, but I may also use it throughout the class in other methods. Some examples:In a constructor:public Light(Vector v){ this.dir = new Vector(v);}El

jQuery Mobile: Markup Enhancement of dynamically added content

jQuery Mobile: Markup Enhancement of dynamically added content

I was wondering how can I enhance dynamically jQuery Mobile page?I have tried to use these methods:$('[data-role="page"]').trigger('create');and$('[data-role="page"]').page();Also how can I prevent enhancement markup of check boxes only?

What is the difference between ++i and i++?

What is the difference between ++i and i++?

In C, what is the difference between using ++i and i++, and which should be used in the incrementation block of a for loop? 1:++i will increment the value of i, and then return the incremented value. i = 1; j = ++i; (i is 2, j is 2)i++ w

Why is extending native objects a bad practice?

Why is extending native objects a bad practice?

Every JS opinion leader says that extending the native objects is a bad practice. But why? Do we get a perfomance hit? Do they fear that somebody does it "the wrong way", and adds enumerable types to Object, practically destroying all loops

How can I make Bootstrap columns all the same height?

How can I make Bootstrap columns all the same height?

I'm using Bootstrap. How can I make three columns all the same height?Here is a screenshot of the problem. I would like the blue and red columns to be the same height as the yellow column. Here is the code:

Why is using 'eval' a bad practice?

Why is using 'eval' a bad practice?

I am using the following class to easily store data of my songs.class Song: """The class to store the details of each song""" attsToStore=('Name', 'Artist', 'Album', 'Genre', 'Location') def __init__(self): for att in self.

How to access the correct `this` inside a callback?

How to access the correct `this` inside a callback?

I have a constructor function which registers an event handler:function MyConstructor(data, transport) { this.data = data; transport.on('data', function () { alert(this.data); });}// Mock transport objectvar transport = {

mysqli_free_result necessary?

mysqli_free_result necessary?

I was looking through my code and read that it was recommened to use mysqli_free_result when your result object is not needed anymore. But after seeing that each query is outputed to the $result variable repeatedly throughout the script, I

Combining MD5 hash values

Combining MD5 hash values

When calculating a single MD5 checksum on a large file, what technique is generally used to combine the various MD5 values into a single value? Do you just add them together? I'm not really interested in any particular language, library o

How can I access OAuth's state parameter using Passport.js?

How can I access OAuth's state parameter using Passport.js?

I'm using Passport.js to do authentication, and per Google's OAuth2 documentation, I'm passing in a state variable:app.get('/authenticate/googleOAuth', function(request, response) { passport.authenticate('google', { scope: [ 'ht

Change the wallpaper on all desktops in OS X 10.7 Lion?

Change the wallpaper on all desktops in OS X 10.7 Lion?

I would like to change the wallpaper of all desktops (formerly "spaces") on a screen. As of OS X 10.6 there is a category to NSWorkspace which allows the setting of the wallpaper, however, when I use this function only the wallpaper of the

Eclipse/javac disagree on compiling signature with default method collision; who is right?

Eclipse/javac disagree on compiling signature with default method collision; who is right?

Here's a simple class that demonstrates the issue:package com.mimvista.debug;public class DefaultCollisionTest { public static interface Interface1 { public String getName(); } public static interface Interface2 { pub

iOS6: MFMailComposeViewController slow to load and flashes black screen; MailCompositionS begins hog

iOS6: MFMailComposeViewController slow to load and flashes black screen; MailCompositionS begins hog

On iOS 6, after sending a few email messages (by using MFMailComposeViewController), the email screens become very slow to open- at first opening with none of the fields populated (no Subject, no body, etc.) for a few seconds, and eventuall

How do you handle strings in C++?

How do you handle strings in C++?

Which is your favorite way to go with strings in C++? A C-style array of chars? Or wchar_t? CString, std::basic_string, std::string, BSTR or CComBSTR?Certainly each of these has its own area of application, but anyway, which is your favorit

How to unbox from object to type it contains, not knowing that type at compile time?

How to unbox from object to type it contains, not knowing that type at compile time?

At the run-time I get boxed instance of some type. How to unbox it to underlying type?Object obj;String variable = "Some text";obj = variable // boxing;// explicit unboxing, because we know the type of variable at compile time.var x = (Stri

Placeholder CSS not being applied in IE 11

Placeholder CSS not being applied in IE 11

I am getting some problem in applying placeholder css.I am trying to apply css (i.e. color:#898F9C;) on input-box placeholder using pseudo-class selector :-ms-input-placeholder, but it's not working in IE.Demo After some hit and try, I get

Animating max-height with CSS transitions

Animating max-height with CSS transitions

I want to create an expand/collapse animation that's powered only by classnames (javascript is used to toggle the classnames).I'm giving one class max-height: 4em; overflow: hidden; and the other max-height: 255em; (I also tried the value n

Is it okay to change a ListView's adapter dynamically?

Is it okay to change a ListView's adapter dynamically?

Instead of creating multiple activities, I would like to change the ArrayAdapter of the ListView as needed. I don't see any mention in the API about whether or not it is okay to call setAdapter() more than once. To be more specific, say I

Response.Redirect results in “Object moved to here”

Response.Redirect results in “Object moved to here”

I'm working on a C# ASP.NET page that normally ends up redirecting to a "file:" URL. This seems to work fine the majority of the time, in the majority of circumstances, but occasionally (and, on my test system, apparently always) instead of

Xcode 5 throws “Library not loaded” error when adding a test target

Xcode 5 throws “Library not loaded” error when adding a test target

I've tried adding a test target on Xcode 5 using the Add Target -> Add Cocoa Touch Unit Testing Bundle. However, when I run the test, I get the following error: 2013-09-24 10:43:14.446 Stack Exchange[48895:c07] Error loading /Users/arieli

Why is 1===1===1 false?

Why is 1===1===1 false?

In a browser console, entering 1===1 evaluates to true. Entering 1===1===1 evaluates to false.I assume that this is because of the way the statement is evaluated:1 === 1 === 1becomes(1 === 1) === 1which evaluates totrue === 1which is false.