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How to efficiently build a tree from a flat structure?
... an ID in the structure. Therefore their could be several trees emerging from these objects.
18 Answers
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How can I cast int to enum?
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From an int:
YourEnum foo = (YourEnum)yourInt;
From a string:
YourEnum foo = (YourEnum) Enum.Parse(typeof(YourEnum), yourString);
// The foo.ToString().Contains(",") check is necessary for enumerations marked with an [Flags...
Copying PostgreSQL database to another server
...and psql is for restoring. So, the first command in this answer is to copy from local to remote and the second one is from remote to local. More -> https://www.postgresql.org/docs/9.6/app-pgdump.html
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How can I get the count of milliseconds since midnight for the current?
Note, I do NOT want millis from epoch. I want the number of milliseconds currently on the clock.
11 Answers
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Extracting numbers from vectors of strings
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Update
Since extract_numeric is deprecated, we can use parse_number from readr package.
library(readr)
parse_number(years)
Here is another option with extract_numeric
library(tidyr)
extract_numeric(years)
#[1] 20 1
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java.net.SocketException: Connection reset
I am getting the following error trying to read from a socket. I'm doing a readInt() on that InputStream , and I am getting this error. Perusing the documentation this suggests that the client part of the connection closed the connection. In this scenario, I am the server.
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Remove file from the repository but keep it locally
... Will this result in (files in) the directory being removed when he pulls from the remote?
– bstpierre
Aug 12 '10 at 16:24
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How do you make sure email you send programmatically is not automatically marked as spam?
... Some spam systems take into account individual reading habits. (Do emails from this sender get read or are they deleted without reading? Etc.) So this will definitely help you find when they are being flagged (true negative), but this step won't prove that they won't for other users on the same sys...
Download file from an ASP.NET Web API method using AngularJS
... Get the headers
headers = headers();
// Get the filename from the x-filename header or default to "download.bin"
var filename = headers['x-filename'] || 'download.bin';
// Determine the content type from the header or default to "application/octet-stream"
v...
How to make a class JSON serializable
...wn custom serialization.
For a trivial example, see below.
>>> from json import JSONEncoder
>>> class MyEncoder(JSONEncoder):
def default(self, o):
return o.__dict__
>>> MyEncoder().encode(f)
'{"fname": "/foo/bar"}'
Then you pass this class in...