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PHP Pass by reference in foreach [duplicate]
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146
Because on the second loop, $v is still a reference to the last array item, so it's overwritte...
PHP Regex to check date is in YYYY-MM-DD format
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198
Try this.
$date="2012-09-12";
if (preg_match("/^[0-9]{4}-(0[1-9]|1[0-2])-(0[1-9]|[1-2][0-9]|...
Difference between `mod` and `rem` in Haskell
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183
They're not the same when the second argument is negative:
2 `mod` (-3) == -1
2 `rem` (-3) ...
How to form tuple column from two columns in Pandas
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edited Nov 7 '16 at 16:58
answered Apr 17 '13 at 19:24
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Intersection of two lists in Bash
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291
comm -12 <(ls 1) <(ls 2)
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creating list of objects in Javascript
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146
var list = [
{ date: '12/1/2011', reading: 3, id: 20055 },
{ date: '13/1/2011', readin...
Boolean operators && and ||
...an return a vector, like this:
((-2:2) >= 0) & ((-2:2) <= 0)
# [1] FALSE FALSE TRUE FALSE FALSE
The longer form evaluates left to right examining only the first element of each vector, so the above gives
((-2:2) >= 0) && ((-2:2) <= 0)
# [1] FALSE
As the help page says...
The modulo operation on negative numbers in Python
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134
Unlike C or C++, Python's modulo operator (%) always return a number having the same sign as t...
Passing arguments forward to another javascript function
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551
Use .apply() to have the same access to arguments in function b, like this:
function a(){
b...
How to undo 'git reset'?
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Short answer:
git reset 'HEAD@{1}'
Long answer:
Git keeps a log of all ref updates (e.g., checkout, reset, commit, merge). You can view it by typing:
git reflog
Somewhere in this list is the commit that you lost. Let's say you just typed git reset HE...