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Joe

這個地方,記錄著我生活中的點點滴滴… 老的時候,就可以抱著孫子看著這blog說「你看,爺爺當初也蠢過!」. ScaVa- Scala] Scalaz Writer Monad. ScaVa- Scala] Scalaz Writer Monad. ScaVa- Scala] Scalaz Writer Monad. 之前一篇 [ScaVa- Scala] Scala中使用Reader Monad來實現Dependency Injection. 65292;裡面提到了Scalaz中的Reader Monad,有Reader當然也要有個Writer呀! Computations that log a value. 假設今天有一個需求,是要進行一個有多個步驟的處理,而這個處理的過程我們需要Log起來,也就是在每個步驟加上對應的記錄,並且在處理完成之後,要能把過程印在畫面上,在許多個步驟在處理時,這些Log要怎麼收集呢? 可以看到,因為是monad,所以我這邊透過for comprehension來把這些動作串起來,最後產生了. 當你要把一個Monoid(在我們的例子用的Monoid是Vector)放在Writ...

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Joe | blog.joecwu.com Reviews
<META>
DESCRIPTION
這個地方,記錄著我生活中的點點滴滴… 老的時候,就可以抱著孫子看著這blog說「你看,爺爺當初也蠢過!」. ScaVa- Scala] Scalaz Writer Monad. ScaVa- Scala] Scalaz Writer Monad. ScaVa- Scala] Scalaz Writer Monad. 之前一篇 [ScaVa- Scala] Scala中使用Reader Monad來實現Dependency Injection. 65292;裡面提到了Scalaz中的Reader Monad,有Reader當然也要有個Writer呀! Computations that log a value. 假設今天有一個需求,是要進行一個有多個步驟的處理,而這個處理的過程我們需要Log起來,也就是在每個步驟加上對應的記錄,並且在處理完成之後,要能把過程印在畫面上,在許多個步驟在處理時,這些Log要怎麼收集呢? 可以看到,因為是monad,所以我這邊透過for comprehension來把這些動作串起來,最後產生了. 當你要把一個Monoid(在我們的例子用的Monoid是Vector)放在Writ...
<META>
KEYWORDS
1 這篇同步發佈在我的 blog
2 和 gist
3 使用情境
4 writer monad在scalaz的source code裡的註解是
5 writer monad
6 writer
7 writert
8 的別名 alias ,並且指定writert中的第一個型態
9 scalaz id
10 是scalaz的 identity monad
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這篇同步發佈在我的 blog,和 gist,使用情境,writer monad在scalaz的source code裡的註解是,writer monad,writer,writert,的別名 alias ,並且指定writert中的第一個型態,scalaz id,是scalaz的 identity monad,writert這邊主要裡面有個,的log,和本來要回傳的value,舉個例子,我有四個動作:,1 用名字查出user的id,2 用id查這個user的state,3 用id再查user的age
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Joe | blog.joecwu.com Reviews

https://blog.joecwu.com

這個地方,記錄著我生活中的點點滴滴… 老的時候,就可以抱著孫子看著這blog說「你看,爺爺當初也蠢過!」. ScaVa- Scala] Scalaz Writer Monad. ScaVa- Scala] Scalaz Writer Monad. ScaVa- Scala] Scalaz Writer Monad. 之前一篇 [ScaVa- Scala] Scala中使用Reader Monad來實現Dependency Injection. 65292;裡面提到了Scalaz中的Reader Monad,有Reader當然也要有個Writer呀! Computations that log a value. 假設今天有一個需求,是要進行一個有多個步驟的處理,而這個處理的過程我們需要Log起來,也就是在每個步驟加上對應的記錄,並且在處理完成之後,要能把過程印在畫面上,在許多個步驟在處理時,這些Log要怎麼收集呢? 可以看到,因為是monad,所以我這邊透過for comprehension來把這些動作串起來,最後產生了. 當你要把一個Monoid(在我們的例子用的Monoid是Vector)放在Writ...

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blog.joecwu.com blog.joecwu.com
1

Joe: [ScaVa->Scala] Scala中使用Reader Monad來實現Dependency Injection

http://blog.joecwu.com/2015/08/scalaread-monaddependency-injection.html

這個地方,記錄著我生活中的點點滴滴… 老的時候,就可以抱著孫子看著這blog說「你看,爺爺當初也蠢過!」. ScaVa- Scala] Scala中使用Reader Monad來實現Dependency Injection. ScaVa- Scala] Scala中使用Reader Monad來實現Dependency Injection. ScaVa- Scala] Scala中使用Reader Monad來實現Dependency Injection. 65292;裡面的 Design Concept. 使用了Implicit來做DI(Dependency Injection),也就是把DBClient設計成可從外部指定。 這樣的描述,如果外層沒有要用到,而內層有用到,外層還是要加上這樣的描述。 Implicit的概念上應該比較是”使用者可忽略”的,但是DBClient在這邊其實並不是一個需要被忽略的,而只是為了減少大量重覆的code。 所以在這邊我們要嘗試另一個Reader Monad的方式,來實現DI。 有關Reader Monad,這兩篇文章寫得很清楚:. Case class User(i...

2

Joe: [敗家] 美光Micron Crucial MX200 SSD 500GB M.2 直上 Windows 10

http://blog.joecwu.com/2015/08/micron-crucial-mx200-ssd-500gb-m2.html

這個地方,記錄著我生活中的點點滴滴… 老的時候,就可以抱著孫子看著這blog說「你看,爺爺當初也蠢過!」. 敗家] 美光Micron Crucial MX200 SSD 500GB M.2 直上 Windows 10. 去年(2014)6月份的時候,將電腦大升級,主機板、CPU、Ram、顯示卡、Power…全換了! 就是硬碟沒換,用原來的WD VelociRaptor 1萬轉的 300GB硬碟。 8230;萬轉的硬碟居然是拖累整個系統的老鼠屎!(測試環境為Windows 8). 300GB的硬碟,也不知灌了什麼東西…居然快吃滿了!(模擬市民3 一堆資料片好像就7,80GB). 最近打算灌個Vistual Studio 2015,但硬碟空間不夠,經過一番考慮,決定換新硬碟了! 當初的主機板買的時候,剛好是M.2規則剛出,MSI Z97 Gaming 3剛就好是早期有支持的那一批,所以這次的選購,就以M.2規則為主。 本來的300G都不夠了,所以250G的就不考慮了,直接找500G左右的,上網查了查,就選定這顆…. 美光Micron Crucial MX200 SSD 500GB M.2. ScaVa- S...

3

Joe: [ScaVa->Scala] 好用的Scalaz - Validation

http://blog.joecwu.com/2015/07/scava-scala-scalaz-validation.html

這個地方,記錄著我生活中的點點滴滴… 老的時候,就可以抱著孫子看著這blog說「你看,爺爺當初也蠢過!」. ScaVa- Scala] 好用的Scalaz - Validation. 提到了Scalaz的Either,而今天要提到的是Either的好兄弟 - Validation. 當我們在做Validation的時候,舉例來說,要驗證一個request所帶的參數是不是都是合法的,若這個request有多個參數,有時候我們會希望全部檢查過一遍,把所有有錯誤的地方全部回覆給request端,這樣才是比較有效率的構通模式。(才不會第一次只告訴你第一個參數錯,第二次你改好第一個欄位再來的時候,我才告訴你第二個參數其實也是錯的…). 下面的例子,是一個SearchUsersRequest,裡面寫好了一些檢查的條件,但是當你要用他的時候,你會發現很難去把每個exception都一個個抓出來,然後整理在一起之後組成一個回傳型態的物件再往外傳。 Validate這個function使用了Scalaz所提供的Applicative syntax @ 將ValidationNel[A,B]型態組合起來. ScaVa- S...

4

Joe: [ScaVa->Scala] Scalaz Validation與Either(Disjunction)的另個選擇 - Scalactic Or

http://blog.joecwu.com/2015/07/scava-scala-scalaz-validation-either-scalactic.html

這個地方,記錄著我生活中的點點滴滴… 老的時候,就可以抱著孫子看著這blog說「你看,爺爺當初也蠢過!」. ScaVa- Scala] Scalaz Validation與Either(Disjunction)的另個選擇 - Scalactic Or. Scalactic這個東西,是從ScalaTest發展出來的,為了能方便直接"單獨"使用在Production的環境,當然ScalaTest裡面有包含了完整的Scalactic,如果你有使用ScalaTest的話,可以直接使用Scalactic。 至於Scalaz和Scalactic的差異,細節可以參考這個影片( Comparing Functional Error Handling in Scalaz and Scalactic. 65292;簡單來說,有些觀念上的不同(沒有誰對誰錯),想讓使用上更明暸簡單,不用分Disjunction和Validation兩種型態,提供更單純的型態,而且在描述上可以更直覺。 Sealed abstract class Or[ G, B] extends AnyRef. Object Pass extends Vali...

5

Joe: [ScaVa->Scala] Scalaz Writer Monad

http://blog.joecwu.com/2015/08/scava-scala-scalaz-writer-monad.html

這個地方,記錄著我生活中的點點滴滴… 老的時候,就可以抱著孫子看著這blog說「你看,爺爺當初也蠢過!」. ScaVa- Scala] Scalaz Writer Monad. ScaVa- Scala] Scalaz Writer Monad. ScaVa- Scala] Scalaz Writer Monad. 之前一篇 [ScaVa- Scala] Scala中使用Reader Monad來實現Dependency Injection. 65292;裡面提到了Scalaz中的Reader Monad,有Reader當然也要有個Writer呀! Computations that log a value. 假設今天有一個需求,是要進行一個有多個步驟的處理,而這個處理的過程我們需要Log起來,也就是在每個步驟加上對應的記錄,並且在處理完成之後,要能把過程印在畫面上,在許多個步驟在處理時,這些Log要怎麼收集呢? 可以看到,因為是monad,所以我這邊透過for comprehension來把這些動作串起來,最後產生了. 當你要把一個Monoid(在我們的例子用的Monoid是Vector)放在Writ...

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這個地方,記錄著我生活中的點點滴滴… 老的時候,就可以抱著孫子看著這blog說「你看,爺爺當初也蠢過!」. ScaVa- Scala] Scalaz Writer Monad. ScaVa- Scala] Scalaz Writer Monad. ScaVa- Scala] Scalaz Writer Monad. 之前一篇 [ScaVa- Scala] Scala中使用Reader Monad來實現Dependency Injection. 65292;裡面提到了Scalaz中的Reader Monad,有Reader當然也要有個Writer呀! Computations that log a value. 假設今天有一個需求,是要進行一個有多個步驟的處理,而這個處理的過程我們需要Log起來,也就是在每個步驟加上對應的記錄,並且在處理完成之後,要能把過程印在畫面上,在許多個步驟在處理時,這些Log要怎麼收集呢? 可以看到,因為是monad,所以我這邊透過for comprehension來把這些動作串起來,最後產生了. 當你要把一個Monoid(在我們的例子用的Monoid是Vector)放在Writ...

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