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What is the combinatory logic equivalent of intuitionistic type theory?
I recently completed a university course which featured Haskell and Agda (a dependent typed functional programming language), and was wondering if it was possible to replace lambda calculus in these with combinatory logic. With Haskell this seems possible using the S and K combinators, thus making i...
How to delete from a text file, all lines that contain a specific string?
...tern to match/d' ./infile
To directly modify the file – does not work with BSD sed:
sed -i '/pattern to match/d' ./infile
Same, but for BSD sed (Mac OS X and FreeBSD) – does not work with GNU sed:
sed -i '' '/pattern to match/d' ./infile
To directly modify the file (and create a backup) ...
Script to kill all connections to a database (More than RESTRICTED_USER ROLLBACK)
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edited Mar 3 '17 at 10:08
answered Aug 26 '11 at 7:26
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Turn on IncludeExceptionDetailInFaults (either from ServiceBehaviorAttribute or from the
...;
</system.serviceModel>
</configuration>
You can also set it programmatically. See this question.
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Postgres: Distinct but only for one column
I have a table on pgsql with names (having more than 1 mio. rows), but I have also many duplicates. I select 3 fields: id , name , metadata .
...
How to use jQuery in chrome extension?
I am writing a chrome extension. And I want to use jQuery in my extension. I am not using any background page , just a background script .
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Cross cutting concern example
... that refers to a part of the system divided on the basis of the functionality.
Concerns are two types:
The concerns representing single and specific functionality for primary requirements are known as core concerns.
OR
Primary functionlity of the system is knows as core concerns.
For exampl...
Why are Docker container images so large?
I made a simple image through Dockerfile from Fedora (initially 320 MB).
8 Answers
8
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How to show the loading indicator in the top status bar
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It's in UIApplication:
For Objective C:
Start:
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
End:
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
For swift :
Start
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Rails: select unique values from a column
...+
Model.distinct.pluck(:rating)
Update
Apparently, as of rails 5.0.0.1, it works only on "top level" queries, like above. Doesn't work on collection proxies ("has_many" relations, for example).
Address.distinct.pluck(:city) # => ['Moscow']
user.addresses.distinct.pluck(:city) # => ['Moscow...