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Bootstrap select dropdown list placeholder
I am trying to make a dropdown list that contains a placeholder. It doesn't seem to support placeholder="stuff" as other forms do. Is there a different way to obtain a placeholder in my dropdown?
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How do you find the disk size of a Postgres / PostgreSQL table and its indexes
...relation_size('"' || table_schema || '"."' || table_name || '"') DESC;
Edit: Here's the query submitted by @phord, for convenience:
SELECT
table_name,
pg_size_pretty(table_size) AS table_size,
pg_size_pretty(indexes_size) AS indexes_size,
pg_size_pretty(total_size) AS total_size
F...
Why covariance and contravariance do not support value type
IEnumerable<T> is co-variant but it does not support value type, just only reference type. The below simple code is compiled successfully:
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Removing duplicate objects with Underscore for Javascript
...5},{a:2},{a:3},{a:4},{a:3},{a:2}];
var uniqueList = _.uniq(list, function(item, key, a) {
return item.a;
});
// uniqueList = [Object {a=1, b=5}, Object {a=2}, Object {a=3}, Object {a=4}]
Notes:
Callback return value used for comparison
First comparison object with unique return value used...
Code coverage for Jest
... directory I found an index.html file that could be loaded into a browser. It included the information printed at the command line, plus additional information and some graphical output.
share
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imp...
What is the difference between async.waterfall and async.series
The nodejs async module: https://github.com/caolan/async provides 2 similar methods, async.waterfall and async.series .
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How do I upgrade my ruby 1.9.2-p0 to the latest patch level using rvm?
...p0 (2010-08-18 revision 29036) [x86_64-darwin10.5.0] but I want to update it to the latest patch level using rvm. How can I do this?
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Best practices for large solutions in Visual Studio (2008) [closed]
We have a solution with around 100+ projects, most of them C#. Naturally, it takes a long time to both open and build, so I am looking for best practices for such beasts. Along the lines of questions I am hoping to get answers to, are:
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What is the smallest possible valid PDF?
Out of simple curiosity, having seen the smallest GIF , what is the smallest possible valid PDF file?
4 Answers
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How to generate a random number between a and b in Ruby?
...ction-and-changes-5428.html
Converting to array may be too expensive, and it's unnecessary.
(a..b).to_a.sample
Or
[*a..b].sample
Array#sample
Standard in Ruby 1.8.7+.
Note: was named #choice in 1.8.7 and renamed in later versions.
But anyway, generating array need resources, and solutio...