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How to initialize a List to a given size (as opposed to capacity)?
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I can't say I need this very often - could you give more details as to why you want this? I'd probably put it as a static method in a helper class:
public static class Lists
{
public static List<T> RepeatedDefault<T>(int count)
{
return Repeated(de...
Why use the INCLUDE clause when creating an index?
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@gbn, would you mind explaining this sentence in more detail, and explain why it means that the include clause is not useful for sorting, etc: "The INCLUDE clause adds the data at the lowest/leaf level, rather than in the index tree. This makes the index smaller because it'...
What is the printf format specifier for bool?
...n unescaped percent sign might cause your program to blow up (see here for more). Thus, printf("%s", ...) is safer. If you're not doing any actual formatting to begin with, the printf family of functions is overkill and puts() (or fputs() if you need to print to stderr) is preferable because it's mo...
When should I use a struct instead of a class?
...copy than 16-byte structs, there are many cases where large structs may be more efficient than large class objects, and where the relative advantage of structs grows with the size of the struct.
– supercat
Jan 2 '13 at 16:12
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parseInt vs unary plus, when to use which?
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#Please see this answer for a more complete set of cases
Well, here are a few differences I know of:
An empty string "" evaluates to a 0, while parseInt evaluates it to NaN. IMO, a blank string should be a NaN.
+'' === 0; //true
isNaN...
`ui-router` $stateParams vs. $state.params
...eceived into the url, then use $stateParams. If you want to know something more complex about the state itself, use $state.
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How to generate a core dump in Linux on a segmentation fault?
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This link goes deeper and gives some more options to enable generation of core dumps in linux. The only drawback is that some commands/settings are left unexplained.
– Salsa
Aug 31 '11 at 19:45
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Find all records which have a count of an association greater than zero
...up clause, the code above will return duplicate projects for projects with more than one vacancies. To remove the duplicates, use
Project.joins(:vacancies).group('projects.id')
UPDATE:
As pointed out by @Tolsee, you can also use distinct.
Project.joins(:vacancies).distinct
As an example
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JavaScript Editor Plugin for Eclipse [duplicate]
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