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Is “ ” a replacement of “ ”?
... the same except for the fact that the latter does not need another lookup table to find its actual value. The lookup table is called a DTD, by the way.
You can read more about character entity references in the offical W3C documents.
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How to get share counts using graph API
...er is possible with the Graph API through the fql end-point (the link_stat table):
https://graph.facebook.com/fql?q=SELECT url, normalized_url, share_count, like_count, comment_count, total_count,commentsbox_count, comments_fbid, click_count FROM link_stat WHERE url='http://www.google.com'
tota...
How to create index on JSON field in Postgres?
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Found:
CREATE TABLE publishers(id INT, info JSON);
CREATE INDEX ON publishers((info->>'name'));
As stated in the comments, the subtle difference here is ->> instead of ->. The former one returns the value as text, the lat...
How dangerous is it to access an array out of bounds?
...havior". The literal meaning of this is:
behavior, upon use of a nonportable or erroneous program construct or
of erroneous data, for which this International Standard imposes no
requirements
A non-normative note expands on this:
Possible undefined behavior ranges from ignoring the sit...
hexadecimal string to byte array in python
...hex(hex_string)
bytearray(b'\xde\xad\xbe\xef')
Note that bytes is an immutable version of bytearray.
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Hash Code and Checksum - what's the difference?
...me value. When used as a means of indexing in data structures (e.g. a hash table), a low collision probability is desirable.
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Detecting which UIButton was pressed in a UITableView
I have a UITableView with 5 UITableViewCells . Each cell contains a UIButton which is set up as follows:
26 Answers
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What are some compelling use cases for dependent method types?
...ored in a hash map and referenced by a hash key value. Functions input immutable arguments that are values from the environment, may call other such functions, and write state to the environment. But functions are not allowed to read values from the environment (so the internal code of the function ...
How to find out client ID of component for ajax update/render? Cannot find component with expression
The following code is inspired from PrimeFaces DataGrid + DataTable Tutorials and put into a <p:tab> of a <p:tabView> residing in a <p:layoutUnit> of a <p:layout> . Here is the inner part of the code (starting from p:tab component); the outer part is trivial.
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What is the difference between a port and a socket?
..., W. Richard Stevens)
In most C-derived languages, TCP connections are established and manipulated using methods on an instance of a Socket class. Although it is common to operate on a higher level of abstraction, typically an instance of a NetworkStream class, this generally exposes a reference t...