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What's the role of GetHashCode in the IEqualityComparer in .NET?
...oor choice for iterating over though. Internally, a dictionary contains an array of buckets, where values can be stored. When you add a Key and Value to a dictionary, the GetHashCode method is called on the Key. The hashcode returned is used to determine the index of the bucket in which the Key/Valu...
Understanding checked vs unchecked exceptions in Java
...a null reference; and indexing exceptions, such as attempting to access an array element through an index that is too large or too small.
There's also an important bit of information in the Java Language Specification:
The checked exception classes named in the throws clause are part of the contra...
Is there a difference between copy initialization and direct initialization?
...() and T[] == T* . That is, function types are function pointer types, and array types are pointer-to-element types. This sucks. It can be worked-around by A c3((A())); (parens around the expression).
– Johannes Schaub - litb
Jul 9 '09 at 1:53
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What does O(log n) mean exactly?
...binary search. Another example is quick sort where each time we divide the array into two parts and each time it takes O(N) time to find a pivot element. Hence it N O(log N)
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When to use symbols instead of strings in Ruby?
...all_symbols:
symbols_count = Symbol.all_symbols.count # all_symbols is an array with all
# instantiated symbols.
a = :one
puts a.object_id
# prints 167778
a = :two
puts a.object_id
# prints 167858
a = :one
puts a.object_id
# prints 167778 again - the sa...
Why can templates only be implemented in the header file?
... an approach would face because "type modifier" features like pointers and arrays allow even just the built-in types to give rise to an infinite number of types, what happens when I now extend my program by adding:
baz.cpp
declares and implements class BazPrivate, and uses MyClass<BazPrivate&g...
What is the difference between i++ and ++i?
...why some particular expression chock-full of increments and decrements and array dereferences doesn't work the way they assumed it did.
– Eric Lippert
Jul 27 '10 at 18:56
12
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What are the disadvantages of using persistent connection in PDO
...ost=$host;dbname=" . DATABASE . ';charset=utf8', $username, $password,
array(PDO::ATTR_EMULATE_PREPARES => false,
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION));
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REST API 404: Bad URI, or Missing Resource?
...f there is none, you should NOT return a 404. Return a 200 OK and an empty array, please.
– esmiralha
Jun 28 at 13:12
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How to structure a express.js application?
...utes = fs.readdirSync(routeUrl);
Here I load all my models and routes as arrays of files.
Disclaimer: readdirSync is only ok when called before you start the http server (before .listen). Calling synchronious blocking calls at server start time just makes the code more readable (it's basically a ...