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Ruby class instance variable vs. class variable
...lass variables, you have the convenience of not having to write self.class from an instance object, and (when desirable) you also get automatic sharing throughout the class hierarchy.
Merging these together into a single example that also covers instance variables on instances:
class Parent
@@...
How to install Python package from GitHub? [duplicate]
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To install Python package from github, you need to clone that repository.
git clone https://github.com/jkbr/httpie.git
Then just run the setup.py file from that directory,
sudo python setup.py install
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What is Erlang written in?
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From the Erlang FAQ:
10.6 How did the first Erlang compiler get written?
(or: how was Erlang bootstrapped?) In
Joe's words:
First I designed an abstract machine
to execute Erlang. This was called the
JAM m...
How to find the size of an array in postgresql
...PostgreSQL 9.4 or higher, you can use cardinality:
SELECT cardinality(id) FROM example;
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How can I create a link to a local file on a locally-run web page?
...n versions of many browsers (e.g. Firefox and Chrome) will refuse to cross from the http protocol to the file protocol to prevent malicious behaviour. You'll need to open your webpage locally using the file protocol if you want to do this stuff at all.
Why does it get stuck without file:///?
The f...
Using CSS to affect div style inside iframe
...licy applies, so you can only do this to an iframe element which is coming from your own server.
I use the Prototype framework to make it easier:
frame1.$('mydiv').style.border = '1px solid #000000'
or
frame1.$('mydiv').addClassName('withborder')
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How do I represent a time only value in .NET?
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@sduplooy: Fancy helping us port it from Joda Time then? :)
– Jon Skeet
Jan 10 '10 at 15:23
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Python how to write to a binary file?
...ry vs. text mode means in 2.x. It doesn't matter what type your bytes come from. (In 3.x, of course, binary vs. text mode means that you write bytes vs. unicode, and the \r\n feature is part of the universal newlines options for text.)
– abarnert
Dec 13 '14 at ...
Big-oh vs big-theta [duplicate]
...s
What is the difference between Θ(n) and O(n)?
The following quote from Wikipedia also sheds some light:
Informally, especially in computer science, the Big O notation often is
permitted to be somewhat abused to describe an asymptotic tight bound
where using Big Theta notation might ...
How to sum up elements of a C++ vector?
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I wanted to fix the typo from "accumuate" to "accumulate" by "edit", but was told by stackoverflow that "Edits must be at least 6 characters".
– aafulei
Jun 29 at 9:59
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