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Explain the encapsulated anonymous function syntax
...ve a function expression without a name defined:
(function () {
alert(2 + 2);
}());
Or named function expression:
(function foo() {
alert(2 + 2);
}());
The Parentheses (formally called the Grouping Operator) can surround only expressions, and a function expression is evaluated.
The tw...
django.core.exceptions.ImproperlyConfigured: Error loading MySQLdb module: No module named MySQLdb
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22 Answers
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MySQL Great Circle Distance (Haversine formula)
...& Google Maps:
Here's the SQL statement that will find the closest 20 locations that are within a radius of 25 miles to the 37, -122 coordinate. It calculates the distance based on the latitude/longitude of that row and the target latitude/longitude, and then asks for only rows where the dis...
Retrieving Android API version programmatically
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edited Jan 28 '17 at 19:30
Siarhei
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Remove an item from a dictionary when its key is unknown
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92
Be aware that you're currently testing for object identity (is only returns True if both operand...
How to replace a hash key with another key
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720
hash[:new_key] = hash.delete :old_key
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Test if remote TCP port is open from a shell script
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Raedwald
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answered Feb 27 '12 at 10:35
Alessio GaetaAl...
Process all arguments except the first one (in a bash script)
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692
Use this:
echo "${@:2}"
The following syntax:
echo "${*:2}"
would work as well, but is n...
How to check if a variable is an integer in JavaScript?
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Turning multi-line string into single comma-separated
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You can use awk and sed:
awk -vORS=, '{ print $2 }' file.txt | sed 's/,$/\n/'
Or if you want to use a pipe:
echo "data" | awk -vORS=, '{ print $2 }' | sed 's/,$/\n/'
To break it down:
awk is great at handling data broken down into fields
-vORS=, sets the "output re...