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Is there a method that calculates a factorial in Java?
... for this one to reuse?
I could use such a method with standard types (Eg. int, long...) and with BigInteger / BigDecimal, too.
...
When to use IList and when to use List
I know that IList is the interface and List is the concrete type but I still don't know when to use each one. What I'm doing now is if I don't need the Sort or FindAll methods I use the interface. Am I right? Is there a better way to decide when to use the interface or the concrete type?
...
How do C++ class members get initialized if I don't do it explicitly?
...pile error if you do not explicitly initialize it.
For primitive types (pointers, ints, etc), they are not initialized -- they contain whatever arbitrary junk happened to be at that memory location previously.
For references (e.g. std::string&), it is illegal not to initialize them, and your c...
How can I remove a character from a string using Javascript?
...g.prototype.removeCharAt = function (i) {
var tmp = this.split(''); // convert to an array
tmp.splice(i - 1 , 1); // remove 1 element from the array (adjusting for non-zero-indexed counts)
return tmp.join(''); // reconstruct the string
}
console.log("crt/r2002_2".removeCharAt(4));
Sin...
What is a NullReferenceException, and how do I fix it?
... different meanings:
Object variables which are uninitialized and hence point to nothing. In this case, if you access properties or methods of such objects, it causes a NullReferenceException.
The developer is using null intentionally to indicate there is no meaningful value available. Note that C#...
How to create a SQL Server function to “join” multiple rows from a subquery into a single delimited
...-- for each vehicle, select the first location
SELECT
VehicleID,
CONVERT(nvarchar(MAX), City) Cities,
Rank
FROM
RankedLocations
WHERE
Rank = 1
-- then incrementally concatenate with the next location
-- this will return intermediate concatenations that will be
-- fi...
Where can I find the “clamp” function in .NET?
...ains a using directive for the namespace e.g.
using Core.ExtensionMethods
int i = 4.Clamp(1, 3);
.NET Core 2.0
Starting with .NET Core 2.0 System.Math now has a Clamp method that can be used instead:
using System;
int i = Math.Clamp(4, 1, 3);
...
How to use null in switch
...e reason that the compiler doesn't complain about switch (i) where i is an Integer is because Java auto-unboxes the Integer to an int. As assylias already said, the unboxing will throw a NullPointerException when i is null.
* Since Java 7 you can use String in switch statements.
More about switch ...
How do I decode a base64 encoded string?
...
Simple:
byte[] data = Convert.FromBase64String(encodedString);
string decodedString = Encoding.UTF8.GetString(data);
share
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The new keyword “auto”; When should it be used to declare a variable type? [duplicate]
... being created, just by looking at the code.
1. Avoid using new and raw-pointers though.
Sometime, the type is so irrelevant that the knowledge of the type is not even needed, such as in expression template; in fact, practically it is impossible to write the type (correctly), in such cases auto...