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Java logical operator short-circuiting
Which set is short-circuiting, and what exactly does it mean that the complex conditional expression is short-circuiting?
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Why does ++[[]][+[]]+[+[]] return the string “10”?
This is valid and returns the string "10" in JavaScript ( more examples here ):
9 Answers
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Associative arrays in Shell scripts
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To add to Irfan's answer, here is a shorter and faster version of get() since it requires no iteration over the map contents:
get() {
mapName=$1; key=$2
map=${!mapName}
value="$(echo $map |sed -e "s/.*--${key}=\([^ ]*\).*/\1/" -e 's/:SP:/ /g' )"
}
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Error handling in Bash
What is your favorite method to handle errors in Bash?
The best example of handling errors I have found on the web was written by William Shotts, Jr at http://www.linuxcommand.org .
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Replace all non Alpha Numeric characters, New Lines, and multiple White Space with one Space
...would be [\W_]
text.replace(/[\W_]+/g," ");
\W is the negation of shorthand \w for [A-Za-z0-9_] word characters (including the underscore)
Example at regex101.com
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Covariance, Invariance and Contravariance explained in plain English?
Today, I read some articles about Covariance, Contravariance (and Invariance) in Java. I read the English and German Wikipedia article, and some other blog posts and articles from IBM.
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Simulator error FBSSystemServiceDomain code 4
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Go to the iOS Simulator menu and select Reset Content and Settings.
Alternatively, you could quit and reopen the Simulator.
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Case conventions on element names?
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Most XML standards originating from the W3C tend to use lower case with hyphens.
There is a philosophical distinction between seeing XML as a format for platform neutral documents, which W3C standards try to encourage, and languages su...
Rolling median algorithm in C
...ial window of values, then perform a binary search to insert the new value and remove the existing one at each iteration.
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Flexbox and Internet Explorer 11 (display:flex in ?)
I am planning to move away from "floaty" layouts and use CSS flexbox for future projects. I was delighted to see that all major browsers in their current versions seem to support (in one way or another) flexbox.
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