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An error occurred while installing pg (0.17.1), and Bundler cannot continue
...to build native extension
To install dependencies on Ubuntu try this:
sudo apt-get install libpq-dev
and this
gem install pg
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What is the best way to concatenate two vectors?
...tics into account? Is there some way I can expect/instruct the compiler to do a single memory move instead of looping over all elements?
– Broes De Cat
Apr 26 '15 at 21:33
2
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Facebook development in localhost
...t; Add Platform - Then select website)
Set the Site URL field (NOT the App Domains field) to http://www.localhost:3000 (this address is for Ruby on Rails, change as needed)
In your application initializer, put in code to detect the environment
Sample Rails 3 code
if Rails.env == 'develo...
MongoDB Aggregation: How to get total records count?
...t LOL.
$result = $collection->aggregate(array(
array('$match' => $document),
array('$group' => array('_id' => '$book_id', 'date' => array('$max' => '$book_viewed'), 'views' => array('$sum' => 1))),
array('$sort' => $sort),
// get total, AND preserve the results
...
simulate background-size:cover on or
...lled my hair out over for a while, but I came across a great solution that doesn't use any script, and can achieve a perfect cover simulation on video with 5 lines of CSS (9 if you count selectors and brackets). This has 0 edge-cases in which it doesn't work perfectly, short of CSS3-compatibility.
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How to split a string and assign it to variables
... into a list of strings, not a list of characters.
– dopatraman
May 27 '16 at 3:49
4
What happen ...
Why can't I have abstract static methods in C#?
... just available without an object reference.
A call to a static method is done through the class name, not through an object reference, and the Intermediate Language (IL) code to call it will call the abstract method through the name of the class that defined it, not necessarily the name of the cla...
What's HTML character code 8203?
What does the character code (HTML) ​ ? I found it in one of my jQuery scripts and wondered what it was..
8 Answ...
How to create a hash or dictionary object in JavaScript [duplicate]
...
Don't use an array if you want named keys, use a plain object.
var a = {};
a["key1"] = "value1";
a["key2"] = "value2";
Then:
if ("key1" in a) {
// something
} else {
// something else
}
...
Creating a UIImage from a UIColor to use as a background image for UIButton [duplicate]
...UIButton, though now in Swift we are on extensions rather than categories, don't you think it would be best to have an extension on UIImage for the initializer rather than UIButton
– SwiftMatt
Jan 15 '16 at 10:51
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