F#语言入门之什么是F#语言

F＃是一种函数式编程语言，可以轻松编写正确且可维护的代码。

F＃编程主要涉及定义类型推断和自动泛化的类型和函数。 这使您可以将焦点保留在问题域上并操纵其数据，而不是编程的细节。

open System // Gets access to functionality in System namespace.

// Defines a function that takes a name and produces a greeting.
let getGreeting name =
    sprintf "Hello, %s! Isn't F# great?" name

[<EntryPoint>]
let main args =
    // Defines a list of names
    let names = [ "Don"; "Julia"; "Xi" ]

    // Prints a greeting for each name!
    names
    |> List.map getGreeting
    |> List.iter (fun greeting -> printfn "%s" greeting)

    0

F＃有许多功能，包括：

• 轻量级语法
• 默认不变
• 类型推断和自动泛化
• 一流的功能
• 强大的数据类型
• 模式匹配
• 异步编程

丰富的数据类型

记录和识别联合等数据类型允许您表示复杂的数据和域。

// Group data with Records
type SuccessfulWithdrawal = {
    Amount: decimal
    Balance: decimal
}

type FailedWithdrawal = {
    Amount: decimal
    Balance: decimal
    IsOverdraft: bool
}

// Use discriminated unions to represent data of 1 or more forms
type WithdrawalResult =
    | Success of SuccessfulWithdrawal
    | InsufficientFunds of FailedWithdrawal
    | CardExpired of System.DateTime
    | UndisclosedFailure

F＃记录和区分联合在默认情况下是非null，不可变和可比较的，使它们非常容易使用。完整教程阅读http://nopapp.com/Blog/Article/FSharp-What-Is-FSharp