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Combine two data frames by rows (rbind) when they have different sets of columns
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rbind.fill and bind_rows() both silently drop rownames.
– MERose
Dec 5 '17 at 16:40
4
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What's the difference between :: (double colon) and -> (arrow) in PHP?
...to access instance members).
In general, :: is used for scope resolution, and it may have either a class name, parent, self, or (in PHP 5.3) static to its left. parent refers to the scope of the superclass of the class where it's used; self refers to the scope of the class where it's used; static r...
How do I configure different environments in Angular.js?
... answered Aug 20 '13 at 19:17
André DionAndré Dion
18.2k77 gold badges5151 silver badges5757 bronze badges
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Modify request parameter with servlet filter
...berate, since the class represents the request as it came from the client, and modifying the parameter would not represent that.
One solution is to use the HttpServletRequestWrapper class, which allows you to wrap one request with another. You can subclass that, and override the getParameter method...
Mockito: InvalidUseOfMatchersException
I have a command line tool that performs a DNS check. If the DNS check succeeds, the command proceeds with further tasks. I am trying to write unit tests for this using Mockito. Here's my code:
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How to detect online/offline event cross-browser?
...to accurately detect when the browser goes offline, using the HTML5 online and offline events.
14 Answers
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UIButton remove all target-actions
...Target:action:forControlEvents:, pass nil for the target, NULL for action, and use a control mask that sets all bits (UIControlEventAllEvents).
Objective-C
[someControl removeTarget:nil
action:NULL
forControlEvents:UIControlEventAllEvents];
Swift 2
button.removeTarget(...
Can an html element have multiple ids?
I understand that an id must be unique within an HTML/XHTML page.
18 Answers
18
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Inheriting class methods from modules / mixins in Ruby
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A common idiom is to use included hook and inject class methods from there.
module Foo
def self.included base
base.send :include, InstanceMethods
base.extend ClassMethods
end
module InstanceMethods
def bar1
'bar1'
end
end
module ...
How to recover a dropped stash in Git?
I frequently use git stash and git stash pop to save and restore changes in my working tree. Yesterday I had some changes in my working tree that I had stashed and popped, and then I made more changes to my working tree. I'd like to go back and review yesterday's stashed changes, but git stash ...