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Why does a function with no parameters (compared to the actual function definition) compile?
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The use of function declarators with empty parentheses (not
prototype-format parameter type declarators) is an obsolescent
feature.
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Difference between doseq and for in Clojure
...println 'eager x)))
eager 1
eager 2
eager 3
#'user/eager
Because the def form returns the new var created, and not the value which is bound to it, there's nothing for the REPL to print, and lazy will refer to an unrealized lazy-seq: none of its elements have been computed at all. eager will refer ...
Safest way to convert float to integer in python?
...ss than or equal to 224 can be exactly represented in the single precision format, and any integer with absolute value less than or equal to 253 can be exactly represented in the double precision format.
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ORA-12505, TNS:listener does not currently know of SID given in connect descriptor
... and run ALTER SYSTEM REGISTER. Then exit from SQL*Plus and try the first form again.
If the third one fails but the second one works, add your user account to the ora_dba group. Do this in Control Panel > Computer Management > Local Users and Groups.
Once you can get connections of the fo...
Difference between hard wrap and soft wrap?
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soft : The text in the textarea is not wrapped when submitted in a form. This is default
hard : The text in the textarea is wrapped (contains newlines) when submitted in a form. When "hard" is used, the cols attribute must be specified
Reference: W3Schools
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Trying to start a service on boot on Android
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adb in ADT by default you can find in:
adt-installation-dir/sdk/platform-tools
Enjoy! )
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What does @@variable mean in Ruby?
... 100% as you expect; the article I linked above has plenty of additional information on the subject.
Also keep in mind that, as with most data, you should be extremely careful with class variables in a multithreaded environment, as per dmarkow's comment.
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How to create a new file together with missing parent directories?
...cludes parent directories, i.e. if you are certain that the path is of the form <parent-dir>/<file-name>.
If it does not, i.e. it is a relative path of the form <file-name>, then getParentFile() will return null.
E.g.
File f = new File("dir/text.txt");
f.getParentFile().mkdirs()...
Get cookie by name
... I set up a jsperf test for the offered solutions: jsperf.com/getcookie-performance . Performance strongly differs between browsers.
– sborn
Oct 16 '19 at 14:31
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Index on multiple columns in Ruby on Rails
...at the beginning. i.e. if you index on [:user_id, :article_id], you can perform a fast query on user_id or user_id AND article_id, but NOT on article_id.
Your migration add_index line should look something like this:
add_index :user_views, [:user_id, :article_id]
Question regarding 'unique' ...