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

Find if 24 hrs have passed between datetimes - Python

Find if 24 hrs have passed between datetimes - Python

I have the following method:# last_updated is a datetime() object, representing the last time this program randef time_diff(last_updated): day_period = last_updated.replace(day=last_updated.day+1, hour=1,

What is the rationale for all comparisons returning false for IEEE754 NaN values?

What is the rationale for all comparisons returning false for IEEE754 NaN values?

Why do comparisons of NaN values behave differently from all other values?That is, all comparisons with the operators ==, <=, >=, <, > where one or both values is NaN returns false, contrary to the behaviour of all other values.I suppose th

Local variables in Python nested functions

Local variables in Python nested functions

Okay, bear with me on this, I know it's going to look horribly convoluted, but please help me understand what's happening.from functools import partialclass Cage(object): def __init__(self, animal): self.animal = animaldef gotimes

How do I make a list of data frames?

How do I make a list of data frames?

How do I make a list of data frames and how do I access each of those data frames from the list?For example, how can I put these data frames in a list ?d1 <- data.frame(y1 = c(1, 2, 3), y2 = c(4, 5, 6))d2 <- data.frame(y1 =

Flatten (an irregular) list of lists

Flatten (an irregular) list of lists

Yes, I know this subject has been covered before (here, here, here, here), but as far as I know, all solutions, except for one, fail on a list like this:L = [[[1, 2, 3], [4, 5]], 6]Where the desired output is[1, 2, 3, 4, 5, 6]Or perhaps eve

SSRS date default with formula disables parameter

SSRS date default with formula disables parameter

When I set a default value formula for a date parameter in SSRS, such as:=CDate(”01/” & Month(Now) & “/” & Year(Now))or even:=Nowthe date parameter control becomes disabled with nothing in it. Does anyone know what simple thing (I am sure)

How to integrate a library that uses expression templates?

How to integrate a library that uses expression templates?

I would like to use the Eigen matrix library as the linear algebra engine in my program. Eigen uses expression templates to implement lazy evaluation and to simplify loops and calculations.For example:#includeint main(){ int size = 40; //

Extra padding in

Extra padding in

It seems that every browser adds some magic hardcoded padding inside . Some browsers (IE, Safari, Chrome) make the input box a bit taller, but they properly top align as if it was a regular HTML element. I can live with the extra height. Bu

Ruby on Rails 4 - simple_form multiple select input

Ruby on Rails 4 - simple_form multiple select input

I have a simple_form input field that looks like this:When I leave multiple: true off, the form submits the chosen value for the parameter :particular_users and I can see the value when debugging using "raise params.inspect". However when I

Mockito UnfinishedStubbingException

Mockito UnfinishedStubbingException

I am new to Mockito, I have tried looking into this Exception but I haven´t found a concrete answer. It happens in my code when I use two mocks together, meaning that I give through the constructor of a mock, another mock. Like so:...Operat

qplot and anti-aliasing in R

qplot and anti-aliasing in R

I am using ggplot2 library and am working with the qplot commandI know I can save my output as an anti-aliased image file by using the following command after my qplot ggsave(file="filename.png")But how about my LCD display? is there any wa

Why C# compiler does not allows private property setters in interfaces?

Why C# compiler does not allows private property setters in interfaces?

In certain scenario like a MVVM view-model, I sometimes needs to have private setter as the view-model exposes a state that can only be modified internally.So is this wrong to need a private setter on an interface? (and I mean not particula

How to make a failing $(shell) command interrupt Make

How to make a failing $(shell) command interrupt Make

I have a Makefile that starts by running a tool before applying the build rules (which this tool writes for me). If this tool, which is a python script, exits with a non-null status code, I want GNU Make to stop right there and not go on wi

Why does the ld linker allow multiple class definitions with the same methods?

Why does the ld linker allow multiple class definitions with the same methods?

Consider this file, first.cpp, containing a class definition and use:#include struct Foo{ Foo(){ std::cout and another, second.cpp, containing a conflicting class definition:#include struct Foo{ Foo(); ~Foo();};Foo::~Foo(){ std::co

In Maven, how can I exclude all transitive dependencies from a particular dependency?

In Maven, how can I exclude all transitive dependencies from a particular dependency?

I want to exclude all transitive dependencies from one dependency. In some places I've seen it suggested to use a wildcard for that myParentPackage myParentProject 1.00.000 * * When I do that I get a

Find element at HTML string

Find element at HTML string

Let's suppose I havevar testHTML = "";I want to get above div as JQuery object to manipulate with it. I try to find it with: var found = $(testHTML).find("#demo_div");and with: var found = $(testHTML).find("div");Both without luck. I have e

jQuery Duplicate Selector error

jQuery Duplicate Selector error

I am currently trying to set up a table with 6 clickable cels that allow for a input box to appear so you can add comments but I am getting a duplicated jQuery selector error and also through debugging my second function I found that .html(

assigning class variable as default value to class method argument

assigning class variable as default value to class method argument

I would like to build a method inside a class with default values arguments taken from this class. In general I do filtering on some data. Inside my class I have a method where normally I pass vector of data. Sometimes I don't have the vect

Assigning 'wrap_content' or '-2' to dimension

Assigning 'wrap_content' or '-2' to dimension

I want to create a dimension that would be equal to 'wrap_content' constant.So according to developer.android.com Reference I write:-2But ADT says: Error: Integer types not allowed (at 'horizontal_border_height' with value '-2')Asigning 'w

Is there a concept of “pointers” or “unsafe code” in Java?

Is there a concept of “pointers” or “unsafe code” in Java?

Yesterday I was attending a talk by a CTO of a reputed European Company, and he told until recently he did not know that java has pointers. On confronting him he said he is absolutely sure about existence of pointers/unsafe code in java.

Laravel Eloquent inner join with multiple conditions

Laravel Eloquent inner join with multiple conditions

I have a question about inner joins with multiple on values.I did build my code like this in laravel.public function scopeShops($query) { return $query->join('kg_shops', function($join) { $join->on('kg_shops.id', '=', 'kg_feeds

$(…).on is not a function - jQuery Error

$(…).on is not a function - jQuery Error

I am using dialog box, which I am closing when a user click anywhere on page expect that dialog box.Here is my code:$('body').on('click','.ui-widget-overlay',function(){ $('#myRateSettingsPopup').dialog('close'); }); Somehow its returni

What is the HTTP response code for failed HTTP Delete operation?

What is the HTTP response code for failed HTTP Delete operation?

I have a resources with uri /api/books/122 , if this resource doesn't exist at the point where a client sends HTTP Delete for this resource, what is the appropriate response code from this action? Is it 404 Not Found?Thanks 1:Yes, it wou

android.os.Bundle cannot be resolved in libgdx Android project

android.os.Bundle cannot be resolved in libgdx Android project

I've just started using Libgdx to practice making games and I used the project creation .jar provided on the site to create the initial projects. However an error shows up in the Android project which says: android.os.Bundle cannot be res