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What does !! mean in ruby?
...pying from Matt Van Horn's answer with slight modifications:
1 ^ true
TypeError: can't convert true into Integer
!!1 ^ !!true
=> false
I used it to ensure two variables were either both nil, or both not nil.
raise "Inconsistency" if !!a ^ !!b
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Ruby on Rails: how do I sort with two columns using ActiveRecord?
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if anyone pasted this and saw undefined method error, there's a small typo here. It should be :asc instead of asc: Model.order({price: :desc}, {date: :desc}, {price: :asc})
– nayiaw
Sep 7 '18 at 6:45
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mysql update column with value from another table
... is feasible also if you're using safe updates mode (and you're getting an error indicating that you've tried to update a table without a WHERE that uses a KEY column), by adding:
UPDATE TableB
SET TableB.value = (
SELECT TableA.value
FROM TableA
WHERE TableA.name = TableB.name
)...
Default argument values in JavaScript functions [duplicate]
...fine default parameters... or at least, it certainly didn't throw a syntax error. Chrome did: thanks chrome! And you you @Ravan
– Ziggy
Jul 24 '13 at 18:23
3
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Kotlin secondary constructor
...l the primary constructor otherwise, the compiler will throw the following error
Primary constructor call expected
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How do you reinstall an app's dependencies using npm?
...d doing just npm uninstall without specifying a package but that throws an error.
– trusktr
Oct 12 '12 at 21:42
Do you...
How can I add a string to the end of each line in Vim?
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Visual Block causes issues and errors when using vim as an extension for other things, like VS Code. In those cases, the search and replace the original user is asking for is the reliable option.
– Brettins
Oct 11 '1...
How To Change DataType of a DataColumn in a DataTable?
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Gives error "Object must implement IConvertible." while converting Byte[] to string type column.
– Harshad Vekariya
Mar 22 '18 at 10:27
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Git mergetool generates unwanted .orig files
...range io-slave, klauncher «» unknown protocol, and couldn't create .orig errors. thank you
– Geremia
Jun 22 '16 at 20:10
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How set background drawable programmatically in Android
...le)) where Drawable buttonBackground = myButton.getBackground();I get this error: snag.gy/weYgA.jpg
– Ruchir Baronia
Nov 28 '15 at 21:53
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