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Why is Scala's immutable Set not covariant in its type?
...nt hinges around "the concept behind sets as functions" - could this be expanded upon? For example, what advantages does "a set as a function" give me that a "set as a collection" not? Is it worth losing the use of that covariant type?
– oxbow_lakes
Mar 24 '09 ...
Finding Variable Type in JavaScript
...d]"
With that you would not have to distinguish between primitive values and objects.
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How to disable GCC warnings for a few lines of code
...is one */
#pragma GCC diagnostic pop
foo(d); /* depends on command line options */
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How to add a ScrollBar to a Stackpanel
...ewer around it, the entire content doesn't show up. I tried setting Height and Width to Auto, but no luck. Why should only a limited portion show?
– Shamim Hafiz
Jun 6 '11 at 9:57
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Enabling error display in PHP via htaccess only
...startup_errors on php_flag display_errors on php_flag html_errors on and the pages show internal server error
– Ogugua Belonwu
May 25 '11 at 16:58
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What's the best way to use R scripts on the command line (terminal)?
It's very convenient to have R scripts for doing simple plots from the command line. However, running R from bash scripts is not convenient at all. The ideal might be something like
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Converting string from snake_case to CamelCase in Ruby
...ssify returns a string, whereas #constantize looks up constant in context (and does need camelize). 'active_record'.constantize gives error, 'active_record'.camelize.constantize returns the constant ActiveRecord, 'active_record'.classify returns the string 'ActiveRecord'. And if you did 'no_class'.c...
When do items in HTML5 local storage expire?
...ou can explicitly include some sort of timestamp in what you've got saved, and then use that later to decide whether or not information should be flushed.
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Multiple ModelAdmins/views for same model in Django admin
...e more than one ModelAdmin for the same model, each customised differently and linked to different URLs?
2 Answers
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Check if a table exists in Rails
...came explicit regarding tables/views, collectively data sources.
# Tables and views
ActiveRecord::Base.connection.data_sources
ActiveRecord::Base.connection.data_source_exists? 'kittens'
# Tables
ActiveRecord::Base.connection.tables
ActiveRecord::Base.connection.table_exists? 'kittens'
# Views
Ac...