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How to Test a Concern in Rails
...p the database accordingly (because your dummy class won't have a database table backing it). Moreover, you'll want to not only test the concern but also test the concern's behavior inside your model specs.
So why not kill two birds with one stone? By using RSpec's shared example groups, you can te...
What's the difference between including files with JSP include directive, JSP include action and usi
...tions that include <jsp:include> VS. <%@ include %>
comparison table:
Including Files and Applets in JSP
Pages
Another nice tutorial from coreservlets.com related to tag libraries and
tag files:
Creating Custom JSP Tag Libraries: The
Basics
The official Java EE 5 Tutorial with examples:
...
What's the best way to get the last element of an array without deleting it?
...ning: count(): Parameter must be an array or an object that implements Countable in Command line code on line 1
W8 = Warning: array_key_last() expects parameter 1 to be array, null given in Command line code on line 1
N1 = Notice: Undefined offset: 0 in Command line code on line 1
N2 = Notice: Only ...
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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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 create index on JSON field in Postgres?
...
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...
Why do I need 'b' to encode a string with Base64?
...4 variants may use characters other than + and /. See the Variants summary table at Wikipedia for an overview.
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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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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...