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Random record in ActiveRecord
...order method provided by your database, i.e. Thing.order("RANDOM()").limit(100) for 100 randomly selected entries. (Be aware that it's RANDOM() in PostgreSQL and RAND() in MySQL ... not as portable as you may want it to be.)
– Florian Pilz
Jun 16 '11 at 13:17
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Fastest way to check if a file exist using standard C++/C++11/C?
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Well I threw together a test program that ran each of these methods 100,000 times, half on files that existed and half on files that didn't.
#include <sys/stat.h>
#include <unistd.h>
#include <string>
#include <fstream>
inline bool exists_test0 (const std::string&...
What is the difference between an expression and a statement in Python?
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Sven MarnachSven Marnach
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Does Firefox support position: relative on table elements?
...>
<tbody>
<tr>
<td style="width: 100px; height: 100px; background-color: red; position: relative">
<div style="width: 10px; height: 10px; background-color: green; position: absolute; top: 10px; right: 10px"></div>
&...
Does JavaScript have a built in stringbuilder class?
..."join".
In IE8, both return about equal results.
In IE7, "join" is about 100 times faster unfortunately.
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What's the difference between StaticResource and DynamicResource in WPF?
...rosoft.com/winfx/2006/xaml"
Title="ConflictingStyleWindow" Height="100" Width="100">
<Window.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Styles/ConflictingStyle.xaml" />...
Center Oversized Image in Div
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Why not use -100% for top/right/bottom/left? With that the container could have literally any width.
– Simon
Jun 17 '14 at 10:03
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How do you do natural logs (e.g. “ln()”) with numpy in Python?
... and log-k is the log in base k, e.g.
here k = e
l = np.log(x) / np.log(100)
and l is the log-base-100 of x
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html onchange event not working
...";
Add this to your page initialization:
setInterval(lookForCityChange, 100);
Then define a lookForCityChange() function:
function lookForCityChange()
{
var newCity = document.getElementById("city").value;
if (newCity != city) {
city = newCity;
doSomething(city); //...
What is the difference between require() and library()?
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100
In addition to the good advice already given, I would add this:
It is probably best to avoid ...