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What exactly does stringstream do?
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163
Sometimes it is very convenient to use stringstream to convert between strings and other numer...
Why doesn't the example compile, aka how does (co-, contra-, and in-) variance work?
...Java arrays (which are erroneously covariant):
Object[] arr = new Integer[1];
arr[0] = "Hello, there!";
We just assigned a value of type String to an array of type Integer[]. For reasons which should be obvious, this is bad news. Java's type system actually allows this at compile time. The JVM...
How to perform file system scanning
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195
EDIT: Enough people still hit this answer, that I thought I'd update it for the Go1 API. This...
Rails nested form with has_many :through, how to edit attributes of join model?
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edited Dec 3 '14 at 5:31
answered Feb 17 '10 at 7:16
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What is the difference between Culture and UICulture?
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148
Culture affects how culture-dependent data (dates, currencies, numbers and so on) is presented...
How to implement has_many :through relationships with Mongoid and mongodb?
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151
Mongoid doesn't have has_many :through or an equivalent feature. It would not be so useful wit...
Finding child element of parent pure javascript
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157
The children property returns an array of elements, like so:
parent = document.querySelector(...
A beginner's guide to SQL database design [closed]
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edited Dec 18 '08 at 11:00
community wiki
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jQuery Event : Detect changes to the html/text of a div
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12 Answers
12
Active
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How can I count occurrences with groupBy?
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System.out.println(counted);
}
}
Result:
{Hello=2, World=1}
(There's also the possibility of using groupingByConcurrent for more efficiency. Something to bear in mind for your real code, if it would be safe in your context.)
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