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Cleaner way to update nested structures
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Zippers
Huet's Zipper provides convenient traversal and 'mutation' of an immutable data structure. Scalaz provides Zippers for Stream (scalaz.Zipper), and Tree (scalaz.TreeLoc). It turns out that the structure of the zipper is...
Google Maps: How to create a custom InfoWindow?
The default Google Maps InfoWindow for a map marker is very round. How do I create a custom InfoWindow with square corners?
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How to check all checkboxes using jQuery?
I am not expert with jQuery but I have tried to create a little script for my application. I want to check all checkboxes but it isn't working correctly.
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Make absolute positioned div expand parent div height
As you can see in the CSS below, I want child2 to position itself before child1 . This is because the site I'm currently developing should also work on mobile devices, on which the child2 should be at the bottom, as it contains the navigation which I want below the content on the mobile devices...
How do I copy a hash in Ruby?
I'll admit that I'm a bit of a ruby newbie (writing rake scripts, now). In most languages, copy constructors are easy to find. Half an hour of searching didn't find it in ruby. I want to create a copy of the hash so that I can modify it without affecting the original instance.
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When does invoking a member function on a null instance result in undefined behavior?
...r. It's always undefined behavior to call a member function through a null pointer. If the function is static, it's technically undefined as well, but there's some dispute.
The first thing to understand is why it's undefined behavior to dereference a null pointer. In C++03, there's actually a bit...
How to find the nearest parent of a Git branch?
Let's say I have the following local repository with a commit tree like this:
20 Answers
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Partly JSON unmarshal into a map in Go
...t server will receive and unmarshal JSON data. This data will always be wrapped in an object with key/value pairs. The key-string will act as value identifier, telling the Go server what kind of value it is. By knowing what type of value, I can then proceed to JSON unmarshal the value into the corre...
How can I create an object and add attributes to it?
I want to create a dynamic object (inside another object) in Python and then add attributes to it.
16 Answers
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Create Directory if it doesn't exist with Ruby
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You are probably trying to create nested directories. Assuming foo does not exist, you will receive no such file or directory error for:
Dir.mkdir 'foo/bar'
# => Errno::ENOENT: No such file or directory - 'foo/bar'
To create ne...