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What's the difference between ASCII and Unicode?
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ASCII defines 128 characters, which map to the numbers 0–127. Unicode defines (less than) 221 characters, which, similarly, map to numbers 0–221 (though not all numbers are currently assigned, and some are reserved).
Unicode is a super...
How to get hex color value rather than RGB value?
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142
var hexDigits = new Array
("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","...
How to remove single character from a String
...ccessing individual characters of a String in Java, we have String.charAt(2) . Is there any inbuilt function to remove an individual character of a String in java?
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Performance of foreach, array_map with lambda and array_map with static function
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122
FWIW, I just did the benchmark since poster didn't do it. Running on PHP 5.3.10 + XDebug.
UPD...
Python's equivalent of && (logical-and) in an if-statement
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1529
You would want and instead of &&.
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Concatenating two lists - difference between '+=' and extend()
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225
The only difference on a bytecode level is that the .extend way involves a function call, whic...
Select random row from a sqlite table
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216
Have a look at Selecting a Random Row from an SQLite Table
SELECT * FROM table ORDER BY RANDO...
How to sort a dataframe by multiple column(s)
...ple(order) code:
R> dd[with(dd, order(-z, b)), ]
b x y z
4 Low C 9 2
2 Med D 3 1
1 Hi A 8 1
3 Hi A 9 1
Edit some 2+ years later: It was just asked how to do this by column index. The answer is to simply pass the desired sorting column(s) to the order() function:
R> dd[order(-dd[,4],...