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What is the most efficient way to concatenate N arrays?
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This answer is particularly useful when N is not known ahead of time such as when you have an array of arrays of arbitrary length and you want them all concatenated.
– jfriend00
Jul 9 '16 at 16:05
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Image comparison - fast algorithm
... in computer vision, keypoint matching. This may require some background knowledge to implement, and can be slow.
The second method uses only elementary image processing, and is potentially faster than the first approach, and is straightforward to implement. However, what it gains in understandabi...
Mixing a PHP variable with a string literal
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how to embed a ternary operator that evaluates to two diff strings in a string?
– oldboy
Jul 27 '19 at 7:23
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What is Linux’s native GUI API?
...Window defines a network protocol for communication, and any program that knows how to "speak" this protocol can use it. There is a C library called Xlib that makes it easier to use this protocol, so Xlib is kind of the native GUI API. Xlib is not the only way to access an X Window server; there is ...
Javascript Shorthand for getElementById
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It makes no difference how many libraries use $ if you never load them.
– user113716
Jun 19 '11 at 17:04
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How do I load an org.w3c.dom.Document from XML in a string?
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I realize now that I shouldn't just copy-and-paste the accepted answer but rather read through.
– Vitaly Sazanovich
Nov 13 '13 at 17:45
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What is the preferred syntax for initializing a dict: curly brace literals {} or the dict() function
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Curly braces. Passing keyword arguments into dict(), though it works beautifully in a lot of scenarios, can only initialize a map if the keys are valid Python identifiers.
This works:
a = {'import': 'trade', 1: 7.8}
a = dict({'import': 'trade', 1: 7.8})
This won't work:
a = ...
“open/close” SqlConnection or keep open?
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Disclaimer: I know this is old, but I found an easy way to demonstrate this fact, so I'm putting in my two cents worth.
If you're having trouble believing that the pooling is really going to be faster, then give this a try:
Add the follow...
YouTube Video Embedded via iframe Ignoring z-index?
...ost), appending just ?wmode=transparent as a new query string to the URL.
Now, regardless of what may or may not be on the end of the YouTube URL as a query string already, it gets preserved, and the required wmode parameters get injected or added without damage to what was there before.
Here's th...
How do I convert a Ruby class name to a underscore-delimited symbol?
...ut you will have to install ActiveSupport just to do that, as ipsum says.
If you don't want to install ActiveSupport just for that, you can monkey-patch underscore into String yourself (the underscore function is defined in ActiveSupport::Inflector):
class String
def underscore
word = self.d...