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Why are ToLookup and GroupBy different?
...table with a billion rows in it?
The billion rows are sent over the wire, and you build the lookup table locally.
What happens when you call GroupBy on such an object?
A query object is built; end of story.
When that query object is enumerated then the analysis of the table is done on the databa...
What's the difference between struct and class in .NET?
What's the difference between struct and class in .NET?
19 Answers
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How does Activity.finish() work in Android?
...on. The finish() operation will not even begin until you return control to Android.
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jQuery UI slider Touch & Drag/Drop support on Mobile devices
I have already styled and implemented jQuery UI slider into a project. Though it's responsive, the slider does not respond to being touched and dragged. Instead, you have to touch where you want the slider to go. I'd like to avoid swapping to jQuery mobile UI, which supports touching and dragging, s...
List comprehension with if statement
I want to compare 2 iterables and print the items which appear in both iterables.
4 Answers
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Minimum and maximum date
I was wondering which is the minimum and the maximum date allowed for a Javascript Date object. I found that the minimum date is something like 200000 B.C., but I couldn't get any reference about it.
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Difference between var_dump,var_export & print_r
What is the difference between var_dump , var_export and print_r ?
2 Answers
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JSR-303 @Valid annotation not working for list of child objects
...sses member of UserAddressesForm with @Valid annotation. See section 3.1.3 and 3.5.1 of JSR 303: Bean Validation. As I explained in my answer to the question Is there a standard way to enable JSR 303 Bean Validation using annotated method, this is the real use of @Valid annotation as per JSR 303.
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Is there a Newline constant defined in Java like Environment.Newline in C#?
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As of Java 7 (and Android API level 19):
System.lineSeparator()
Documentation: Java Platform SE 7
For older versions of Java, use:
System.getProperty("line.separator");
See https://java.sun.com/docs/books/tutorial/essential/enviro...
Rails: redirect_to with :error, but flash[:error] empty
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As stated in the Rails API only :notice and :alert are by default applied as a flash hash value. If you need to set the :error value, you can do it like this:
redirect_to show_path, flash: { error: "Insufficient rights!" }
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