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What is the difference between Integer and int in Java?
...ence to an object of (class) type Integer, or to null.
Java automatically casts between the two; from Integer to int whenever the Integer object occurs as an argument to an int operator or is assigned to an int variable, or an int value is assigned to an Integer variable. This casting is called box...
Why do we need boxing and unboxing in C#?
...ble)o;
First we have to explicitly unbox the double ((double)o) and then cast that to an int.
What is the result of the following:
double e = 2.718281828459045;
double d = e;
object o1 = d;
object o2 = e;
Console.WriteLine(d == e);
Console.WriteLine(o1 == o2);
Think about it for a second befor...
Make copy of an array
...
The cast is unnecessary; a good static analyzer will warn about it. But cloning is definitely the best way to make a new copy of an array.
– erickson
Apr 26 '11 at 4:23
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How do you sort a dictionary by value?
... Using the 4.5 framework, just verified that it does not require a cast back to dictionary.
– Jagd
Jun 26 '14 at 19:36
12
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Is Python strongly typed?
...nversions required), but the type system can be subverted by using pointer casts.
The strength of the type system in a dynamic language such as Python is really determined by how its primitives and library functions respond to different types. E.g., + is overloaded so that it works on two numbers o...
How to convert string to boolean php
...
To explicitly convert a value to boolean, use the (bool) or (boolean)
casts. However, in most cases the cast is unnecessary, since a value
will be automatically converted if an operator, function or control
structure requires a boolean argument.
See also Type Juggling.
When conver...
What does “while True” mean in Python?
...
@Blindy: in a weakly-typed language with automatic casting, you can say x 'evaluates to' y... it's not while 5 is not strictly equal to 0, it's while 5 is loosely equal to True.
– Dagg Nabbit
Sep 20 '10 at 21:13
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Why array implements IList?
... (and transitively, ICollection) simplified the Linq2Objects engine, since casting the IEnumerable to IList/ICollection would also work for arrays.
For example, a Count() ends up calling the Array.Length under-the-hood, since it's casted to ICollection and the array's implementation returns Length...
How to declare a variable in a PostgreSQL query
...ars.id')::int;
Config settings are always varchar values, so you need to cast them to the correct data type when using them. This works with any SQL client whereas \set only works in psql
The above requires Postgres 9.2 or later.
For previous versions, the variable had to be declared in postgre...
Swift - which types to use? NSString or String
...wift type, as in str.bridgeToObjectiveC().length for example. You can also cast a String to an NSString by using str as NSString.
However, the necessity for these techniques to explicitly use the Foundation types, or at least some of them, may be obsolete in the future, since from what is stated in...