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What's an elegant way to conditionally add a class to an HTML element in a view?
...lly you should represent success with boolean true or a numeric record ID, and failure with boolean false or nil. This way you can just test your variable:
<div class="<%= 'ok' if @success %>">
A second form using the ternary ?: operator is useful if you want to choose between two cl...
Maximum Length of Command Line String
In Windows, what is the maximum length of a command line string? Meaning if I specify a program which takes arguments on the command line such as abc.exe -name=abc
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How do I apply a perspective transform to a UIView?
...ws] objectAtIndex:0];
CALayer *layer = myView.layer;
CATransform3D rotationAndPerspectiveTransform = CATransform3DIdentity;
rotationAndPerspectiveTransform.m34 = 1.0 / -500;
rotationAndPerspectiveTransform = CATransform3DRotate(rotationAndPerspectiveTransform, 45.0f * M_PI / 180.0f, 0.0f, 1.0f, 0.0f...
Rails formatting date
I am posting a date to an API and the required format is as follows:
4 Answers
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How to check if an intent can be handled from some activity?
... startActivity(intent);
} else {
Log.d(TAG, "No Intent available to handle action");
}
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How do I validate a date string format in python?
...xcept? Python tends to slow down significantly when an exception is raised and caught.
– chiffa
Sep 6 '16 at 1:26
1
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Default function arguments in Rust
...echnique employed here is to use functions or methods with different names and signatures.
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How to UPSERT (MERGE, INSERT … ON DUPLICATE UPDATE) in PostgreSQL?
...o do an upsert, which is what MySQL calls INSERT ... ON DUPLICATE UPDATE and the standard supports as part of the MERGE operation.
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postgresql COUNT(DISTINCT …) very slow
...ount int not null), using triggers. But your write performance will suffer and if you update multiple x values in single transaction then you'd need to do this in some explicit order to avoid possible deadlock.
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Given an RGB value, how do I create a tint (or shade)?
... an RGB value, like 168, 0, 255 , how do I create tints (make it lighter) and shades (make it darker) of the color?
3 Answ...