coding style

名稱

變數或是 function 以 boolean 方式存在, 名子開頭請以
- is
- can
- has
- should
Naming Scalars Like Objects
```
 // bad
 store = "Jason's Capsaicin Station"
 // good
 store_name = "Jason's Capsaicin Station"
```
Explanation: If I see a variable name like store, I think it’s an object. This problem becomes especially severe when the codebase does in fact have a class called Store and some stores are instances of that class and some stores are just store names.
Naming Counts Like Collections
```
 // bads
 products = 0
 // good
 product_count = 0
```
Explanation: If I see a variable called products I would probably expect its value to be a collection of some sort. I would be surprised when I tried to iterate over the collection only to discover that it’s actually an integer.
Naming a Variable After Its Type
```
 // bad
 array = []
 // good
 customers = []
```
Explanation: A variable called array or hash could contain pretty much anything. By choosing a name like this you’re forcing the reader to do all the thinking.
Use of “Stuff Words” For Collections
Bad examples:
```
 news[0]
 inventory[0]
```
Good examples:
```
 articles[0]
 inventory_items[0]
```
Explanation: There are certain words that have no singular form. Examples include “stuff”, “garbage” and “laundry”. I call these “stuff words”. This anti-pattern especially applies to database table names.

用介係詞組成變數名稱(of,for,from,on)

var daysSinceModification = 3; // 在修改已過了3天
var workDaysPerWeek = 5; // 每週工作5天
var daysUntilDeadline = 10; // deadline前還剩10天

使用更具體的單位

如等待時間

//bad
waitingOfTimes
// ok
waitingOfSeconds

使用更好的Iterator; 不要使用 i,j,k, 這樣可以提高可讀性, 也比較容易 debug

如 Key/Value Mystery

Bad examples:

products.each { |key, value| puts value }
products.each { |k, v| puts v }

Good example:

products.each { |name, price| puts price }

Explanation: Names like key and value have almost no meaning. There’s almost always a more purpose-revealing option.

Function Name的prefix都是動詞

fetch：從遠端(透過API)獲取資料，例如：fetchUsers()
load：從本地端加載資料，例如：loadFile()
calculate/calc：通過計算獲取資料，例如：calcBMI()
show：顯示物件，如showModal()、showDialog()
remove：將資料之間的關係移除，資料本身還是會存在
delete/destroy：將資料刪除，資料將會不存在
on：定義event的時候使用，像是onClick,onChange
handle：當onClick之類的event發生時所觸發的function，
例如：handleClick，如果click後面有受詞的話，
這將受詞移到click前方* 例如：handleButtonClick
get/set
create: insert append add append
edit: modify update
complete: finish done end
send: deliver, dispatch, announce, distribute, route
find: search, extract, locate, recover
start: launch, create, begin, open
make: create, set upm build, genernate, compose, add, new

縮寫真的方便但並不是最好; 廣為人知的才能夠用, 如果只有開發團隊懂的縮寫還是少用, 或是有一個對照表

Bad examples:

passwd
fname
cust
o

Good examples:

password
first_name
customer
order

Explanation: Abbreviations like passwd violate the Principle of Least Astonishment. If I know a class has a password attribute I should be able to guess that that attribute is called password. Since passwd is pretty much totally arbitrary, it’s a practically unguessable. Plus, how valuable is it to save two keystrokes?

寫註解

在檔案的最前頭寫上整個程式檔案大致是如何運作的檔案註解
除了解釋程式運作的原理外，還可以描述為什麼要用這樣子的寫法來寫，可能是效能上的需求之類的
使用 TODO FIXME 等註解標籤
- TODO可以標記尚未製作或是需要優化的部分
- FIXME是不能運作需要修復的部分
在設定常數的時候給予註解其實也能幫助理解，讓開發者更有概念，像是下面程式註解說明為什麼要設定為1000的理由
```
  // 加上合理的限制 - 沒有人能讀那麼多文章
  const int MAX_RSS_SUBSCRIPTIONS = 1000;
```

「英文不好」是個很大的題目，相對於「聽、讀」，「說、寫」的自學門檻較高。以程式設計師來說，「寫英文」的需求可分為至少兩大方面:

命名
- 名詞: 變數(variable), 類別(class)
- 動詞: 函式(function)/方法(method)
說明/描述
- 短文註解 (code/commit comment)
- 長篇文件(documentation)/手冊(manual)

這個微軟 PowerShell 指令動詞列表當然不是唯一的標準，但它列出了許多動詞 (尤其是程式設計領域常用的動詞) 及其使用情景的說明，可以作為動詞命名的參考。

refer: