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Eric Zuo zuoky

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zuoky / LC_CTYPE.txt
Created November 21, 2017 00:55 — forked from thanksdanny/LC_CTYPE.txt
Centos warning: setlocale: LC_CTYPE: cannot change locale (UTF-8): No such file or directory
vi /etc/environment
add these lines...
LANG=en_US.utf-8
LC_ALL=en_US.utf-8
@zuoky
zuoky / gist:125711539828f409e0d8bf94f581eaee
Created February 11, 2017 03:45 — forked from CristinaSolana/gist:1885435
Keeping a fork up to date

1. Clone your fork:

git clone [email protected]:YOUR-USERNAME/YOUR-FORKED-REPO.git

2. Add remote from original repository in your forked repository:

cd into/cloned/fork-repo
git remote add upstream git://github.com/ORIGINAL-DEV-USERNAME/REPO-YOU-FORKED-FROM.git
git fetch upstream
@zuoky
zuoky / anorm.scala
Created January 21, 2016 13:20 — forked from davegurnell/anorm.scala
A short guide to Anorm
/*
Overview
--------
To run a query using anorm you need to do three things:
1. Connect to the database (with or without a transaction)
2. Create an instance of `anorm.SqlQuery` using the `SQL` string interpolator
3. Call one of the methods on `SqlQuery` to actually run the query
@zuoky
zuoky / Blog-ScaVa2Scala-Functor-Applicative-Monad-Semigroup-Monoid.md
Last active August 29, 2015 14:27 — forked from joecwu/Blog-ScaVa2Scala-Functor-Applicative-Monad-Semigroup-Monoid.md
[ScaVa->Scala] 什麼是Functor, Applicative, Monad, Semigroup, Monoid? http://blog.joecwu.com/2015/08/scava-scala-functor-applicative-monad.html

Category theory(範疇論)之什麼是Functor, Applicative, Monad, Semigroup, Monoid?

之前曾經寫過一篇 什麼是Monad? ，裡面提到了對於Monad的解釋，而今天進一步解釋這些在Functional Programming中常見到的詞：Functor, Applicative, Monad, Semigroup, Monoid。 透過放在一起比較，讓我們更清楚這些之間的差別與關係。

##Functor

在提到Functor之前，請先了解一下scala中map的作用，map可以讓你傳入一個function，而透過這個function是可以從F[A]轉換成F[B]，這裡的F不管他(就是代表外面的包裝不會變)，而裡面的A型態轉成B型態。

例如：