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Why do we have map, fmap and liftM?
... see an error about lists than about Functors.
-- Typeclassopedia, page 20
fmap and liftM exist because monads were not automatically functors in Haskell:
The fact that we have both fmap and liftM is an
unfortunate consequence of the fact that the Monad type class does not require
a Funct...
“git diff” does nothing
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answered Aug 27 '10 at 0:59
DouglasDouglas
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mongodb find by multiple array items
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170
Depends on whether you're trying to find documents where words contains both elements (text and ...
Use a URL to link to a Google map with a marker on it
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In May 2017 Google launched the official Google Maps URLs documentation. The Google Maps URLs introduces universal cross-platform syntax that you can use in your applications.
Have a look at the following document:
https://develope...
@Override is not allowed when implementing interface method
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answered Mar 14 '13 at 9:06
Bastien JansenBastien Jansen
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What is the right way to POST multipart/form-data using curl?
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edited May 20 '15 at 18:35
evandrix
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PHP substring extraction. Get the string before the first '/' or the whole string
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Use explode()
$arr = explode("/", $string, 2);
$first = $arr[0];
In this case, I'm using the limit parameter to explode so that php won't scan the string any more than what's needed.
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Differences in boolean operators: & vs && and | vs ||
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Those are the bitwise AND and bitwise OR operators.
int a = 6; // 110
int b = 4; // 100
// Bitwise AND
int c = a & b;
// 110
// & 100
// -----
// 100
// Bitwise OR
int d = a | b;
// 110
// | 100
// -----
// 110
System.out.println(c); // 4
System.out.println(d); // 6
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How to copy part of an array to another array in C#?
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int[] b = new int[3];
Array.Copy(a, 1, b, 0, 3);
a = source array
1 = start index in source array
b = destination array
0 = start index in destination array
3 = elements to copy
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R data formats: RData, Rda, Rds etc
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KenMKenM
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