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rails 3 validation on uniqueness on multiple attributes
I use Rails 3.0.0.beta4
3 Answers
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Create a completed Task
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answered Nov 22 '10 at 13:51
QrystaLQrystaL
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Should I use a data.frame or a matrix?
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edited Aug 30 '17 at 0:12
answered Mar 1 '11 at 19:00
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Javascript equivalent of Python's zip function
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2016 update:
Here's a snazzier Ecmascript 6 version:
zip= rows=>rows[0].map((_,c)=>rows.map(row=>row[c]))
Illustration equiv. to Python{zip(*args)}:
> zip([['row0col0', 'row0col1', 'row0col2'],
['row1co...
is_file or file_exists in PHP
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answered Apr 27 '09 at 10:00
hbwhbw
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How to convert a string to an integer in JavaScript?
...simplest way would be to use the native Number function:
var x = Number("1000")
If that doesn't work for you, then there are the parseInt, unary plus, parseFloat with floor, and Math.round methods.
parseInt:
var x = parseInt("1000", 10); // you want to use radix 10
// so you get a decimal n...
Heroku free account limited?
... requests. If each instance of your application can serve each request in 100ms, then you get 600 requests/minute with the free account.
Your application code and its assets (the slug) are limited to 300 MB in total. Your application also has access to the local filesystem, which can serve as an ep...
gunicorn autoreload on source change
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While this is old question you need to know that ever since version 19.0 gunicorn has had the --reload option.
So now no third party tools are needed.
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List distinct values in a vector in R
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answered Oct 13 '11 at 14:08
csgillespiecsgillespie
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How to optimize for-comprehensions and loops in Scala?
... positive number that is evenly divisible by all of the numbers from 1 to 20?"
8 Answers
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