F#語言入門之什麼是F#語言

F＃是一種函數式編程語言，能夠輕鬆編寫正確且可維護的代碼。

F＃編程主要涉及定義類型推斷和自動泛化的類型和函數。 這使您能夠將焦點保留在問題域上並操縱其數據，而不是編程的細節。

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＃有許多功能，包括：

 

• 輕量級語法
• 默認不變
• 類型推斷和自動泛化
• 一流的功能
• 強大的數據類型
• 模式匹配
• 異步編程

豐富的數據類型

記錄和識別聯合等數據類型容許您表示複雜的數據和域。

// 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＃記錄和區分聯合在默認狀況下是非null，不可變和可比較的，使它們很是容易使用。完整教程閱讀http://nopapp.com/Blog/Article/FSharp-What-Is-FSharp