For example, types for SI units have been standardized in the F# core library, in Microsoft.FSharp.Data.UnitSystems.SI. Open the appropriate sub-namespace, UnitNames or UnitSymbols, to use them. Or, if only a few SI units are required, they can be imported with type aliases:
/// Seconds, the SI uni...
class User {
String name
int age
}
def users = [
new User(name: "Bob", age: 20),
new User(name: "Tom", age: 50),
new User(name: "Bill", age: 45)
]
// sort by age
users.sort { a, b -> a.age <=> b.age }
If you don't have permissions to install perl modules, you may still install them manually, indicating a custom path where you've got writing permissions.
Fist, download and unzip module archive:
wget module.tar.gz
tar -xzf module.tar.gz
cd module
Then, if the module distribution contains a M...
All values in Rust have exactly one owner. The owner is responsible for dropping that value when it goes out of scope, and is the only one who may move the ownership of the value. The owner of a value may give away references to it by letting other pieces of code borrow that value. At any given time...
After Successfully installing Xamarin Studio on OS X.
It's time for the first Hello World Application.
Hello World Application: Xamarin.Forms
What is Xamarin Forms :
Xamarin.Forms is a new library that enables you to build native UIs for iOS, Android and Windows Phone from a single, shared C# c...
def honestlyNoParam = { ->
"I Don't have it"
}
// The following all throw IllegalArgumentException
honestlyNoParam.curry('whatever')
honestlyNoParam.rcurry('whatever')
honestlyNoParam.ncurry(0, 'whatever')
This example shows how to establish a connection to an SSL-enabled POP3 email server and send a simple (text only) email.
// Configure mail provider
Properties props = new Properties();
props.put("mail.smtp.host", "smtp.mymailprovider.com");
props.put("ma...
Because generating documentation is based on markdown, you have to do 2 things :
1/ Write your doctest and make your doctest examples clear to improve readability (It is better to give a headline, like "examples" or "tests"). When you write your tests, do not forget to give 4 s...
Once you've installed the .NET CLI tools, you can create a new project with the following command:
dotnet new --lang f#
This creates a command line program.
Specifies a numeric minimum and maximum range for a property
using System.ComponentModel.DataAnnotations;
public partial class Enrollment
{
public int EnrollmentID { get; set; }
[Range(0, 4)]
public Nullable<decimal> Grade { get; set; }
}
If we try to insert/upd...
public class Person
{
public int PersonID { get; set; }
public string PersonName { get; set; }
[Index]
public int Age { get; set; }
}
Creates a database index for a column or set of columns.
[Index("IX_Person_Age")]
public int Age { get; set; }
This creates ...
To find active ScriptableObjects during runtime, you can use Resources.FindObjectsOfTypeAll().
T[] instances = Resources.FindObjectsOfTypeAll<T>();
Where T is the type of the ScriptableObject instance you're searching. Active means it has been loaded in memory in some form before.
This me...
A shallow copy is a copy of a collection without performing a copy of its elements.
>>> import copy
>>> c = [[1,2]]
>>> d = copy.copy(c)
>>> c is d
False
>>> c[0] is d[0]
True
If you have nested lists, it is desireable to clone the nested lists as well. This action is called deep copy.
>>> import copy
>>> c = [[1,2]]
>>> d = copy.deepcopy(c)
>>> c is d
False
>>> c[0] is d[0]
False
You can create shallow copies of lists using slices.
>>> l1 = [1,2,3]
>>> l2 = l1[:] # Perform the shallow copy.
>>> l2
[1,2,3]
>>> l1 is l2
False
Error handling is important but can make an elegant algorithm into a mess.
Railway Oriented Programming (ROP)
is used to make error handling elegant and composable.
Consider the simple function f:
let tryParse s =
let b, v = System.Int32.TryParse s
if b then Some v else None
let f (g : ...
