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What is the difference between Set and List?
...t is inserted. The
user can access elements by their
integer index (position in the list),
and search for elements in the list.
Set<E>:
A collection that contains no
duplicate elements. More formally,
sets contain no pair of elements e1
and e2 such that e1.equals(e2), and at
...
Get the client's IP address in socket.io
...sy way to get the IP address of an incoming connection? I know you can get it from a standard HTTP connection, but socket.io is a bit of a different beast.
...
Ruby Hash to array of values
...
Also, a bit simpler....
>> hash = { "a"=>["a", "b", "c"], "b"=>["b", "c"] }
=> {"a"=>["a", "b", "c"], "b"=>["b", "c"]}
>> hash.values
=> [["a", "b", "c"], ["b", "c"]]
Ruby doc here
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Compile, Build or Archive problems with Xcode 4 (and dependencies)
...tion has evolved over the past several weeks to cover more general issues with xcode4 (and upgrading projects form older xcode s).
...
How to create an HTTPS server in Node.js?
...vateKey, cert: certificate});
var handler = function (req, res) {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Hello World\n');
};
var server = http.createServer();
server.setSecure(credentials);
server.addListener("request", handler);
server.listen(8000);
...
How to get all child inputs of a div element (jQuery)
...
Use it without the greater than:
$("#panel :input");
The > means only direct children of the element, if you want all children no matter the depth just use a space.
...
Tmux vs. iTerm2 split panes
Why should I use tmux when iterm2 has split panes?
4 Answers
4
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Combine two columns of text in pandas dataframe
...
If one (or both) of the columns are not string typed, you should convert it (them) first,
df["period"] = df["Year"].astype(str) + df["quarter"]
Beware of NaNs when doing this!
If you need to join multiple string columns, you can use agg:
df['period'] = df[['Year', 'quarter', ...]].agg('-'.j...
How do I get the list of keys in a Dictionary?
...
is it necessary to use "this."
– Gourav
Sep 30 '15 at 7:45
15
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java.net.ConnectException: localhost/127.0.0.1:8080 - Connection refused
...follow
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edited Sep 23 '19 at 19:58
RealHandy
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