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< div class = "book" data-level = "0.2" data-chapter-title = "Go語言項目" data-filepath = "ch0/ch0-02.md" data-basepath = ".." data-revision = "Thu Dec 24 2015 14:42:02 GMT+0800 (中国标准时间)" >
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前言
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< b > 0.1.< / b >
Go語言起源
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< b > 0.2.< / b >
Go語言項目
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< b > 0.3.< / b >
本書的組織
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< b > 0.4.< / b >
更多的信息
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< b > 0.5.< / b >
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致謝
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< / ul >
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< li class = "chapter " data-level = "1" data-path = "ch1/ch1.html" >
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< b > 1.< / b >
入門
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< b > 1.1.< / b >
Hello, World
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< b > 1.2.< / b >
命令行參數
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< a href = "../ch1/ch1-03.html" >
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< b > 1.3.< / b >
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査找重複的行
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< / li >
< li class = "chapter " data-level = "1.4" data-path = "ch1/ch1-04.html" >
< a href = "../ch1/ch1-04.html" >
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< b > 1.4.< / b >
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GIF動畵
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< li class = "chapter " data-level = "1.5" data-path = "ch1/ch1-05.html" >
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< b > 1.5.< / b >
穫取URL
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< b > 1.6.< / b >
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併發穫取多個URL
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< li class = "chapter " data-level = "1.7" data-path = "ch1/ch1-07.html" >
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< b > 1.7.< / b >
Web服務
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< b > 1.8.< / b >
本章要點
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< b > 2.< / b >
程序結構
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< b > 2.1.< / b >
命名
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< b > 2.2.< / b >
聲明
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< b > 2.3.< / b >
變量
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< b > 2.4.< / b >
賦值
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< b > 2.5.< / b >
類型
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< b > 2.6.< / b >
包和文件
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< b > 2.7.< / b >
作用域
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< li class = "chapter " data-level = "3" data-path = "ch3/ch3.html" >
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< b > 3.< / b >
基礎數據類型
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< b > 3.1.< / b >
整型
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< li class = "chapter " data-level = "3.2" data-path = "ch3/ch3-02.html" >
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< b > 3.2.< / b >
浮點數
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< li class = "chapter " data-level = "3.3" data-path = "ch3/ch3-03.html" >
< a href = "../ch3/ch3-03.html" >
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< b > 3.3.< / b >
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複數
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< li class = "chapter " data-level = "3.4" data-path = "ch3/ch3-04.html" >
< a href = "../ch3/ch3-04.html" >
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< b > 3.4.< / b >
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布爾型
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< li class = "chapter " data-level = "3.5" data-path = "ch3/ch3-05.html" >
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< b > 3.5.< / b >
字符串
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< b > 3.6.< / b >
常量
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< li class = "chapter " data-level = "4" data-path = "ch4/ch4.html" >
< a href = "../ch4/ch4.html" >
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< b > 4.< / b >
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複合數據類型
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< / a >
< ul class = "articles" >
< li class = "chapter " data-level = "4.1" data-path = "ch4/ch4-01.html" >
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< b > 4.1.< / b >
數組
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< li class = "chapter " data-level = "4.2" data-path = "ch4/ch4-02.html" >
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< b > 4.2.< / b >
切片
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< li class = "chapter " data-level = "4.3" data-path = "ch4/ch4-03.html" >
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< b > 4.3.< / b >
字典
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< b > 4.4.< / b >
結構體
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< li class = "chapter " data-level = "4.5" data-path = "ch4/ch4-05.html" >
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< b > 4.5.< / b >
JSON
< / a >
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< li class = "chapter " data-level = "4.6" data-path = "ch4/ch4-06.html" >
< a href = "../ch4/ch4-06.html" >
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< b > 4.6.< / b >
文本和HTML模闆
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< / ul >
< / li >
< li class = "chapter " data-level = "5" data-path = "ch5/ch5.html" >
< a href = "../ch5/ch5.html" >
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< b > 5.< / b >
函數
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< li class = "chapter " data-level = "5.1" data-path = "ch5/ch5-01.html" >
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< b > 5.1.< / b >
函數聲明
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< li class = "chapter " data-level = "5.2" data-path = "ch5/ch5-02.html" >
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< b > 5.2.< / b >
遞歸
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< li class = "chapter " data-level = "5.3" data-path = "ch5/ch5-03.html" >
< a href = "../ch5/ch5-03.html" >
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< b > 5.3.< / b >
多返迴值
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< li class = "chapter " data-level = "5.4" data-path = "ch5/ch5-04.html" >
< a href = "../ch5/ch5-04.html" >
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< b > 5.4.< / b >
錯誤
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< li class = "chapter " data-level = "5.5" data-path = "ch5/ch5-05.html" >
< a href = "../ch5/ch5-05.html" >
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< b > 5.5.< / b >
函數值
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< li class = "chapter " data-level = "5.6" data-path = "ch5/ch5-06.html" >
< a href = "../ch5/ch5-06.html" >
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< b > 5.6.< / b >
匿名函數
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< li class = "chapter " data-level = "5.7" data-path = "ch5/ch5-07.html" >
< a href = "../ch5/ch5-07.html" >
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< b > 5.7.< / b >
可變參數
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< li class = "chapter " data-level = "5.8" data-path = "ch5/ch5-08.html" >
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< b > 5.8.< / b >
Deferred函數
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< li class = "chapter " data-level = "5.9" data-path = "ch5/ch5-09.html" >
< a href = "../ch5/ch5-09.html" >
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< b > 5.9.< / b >
Panic異常
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< li class = "chapter " data-level = "5.10" data-path = "ch5/ch5-10.html" >
< a href = "../ch5/ch5-10.html" >
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< b > 5.10.< / b >
Recover捕穫異常
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< li class = "chapter " data-level = "6" data-path = "ch6/ch6.html" >
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< b > 6.< / b >
方法
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< li class = "chapter " data-level = "6.1" data-path = "ch6/ch6-01.html" >
< a href = "../ch6/ch6-01.html" >
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< b > 6.1.< / b >
方法聲明
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< li class = "chapter " data-level = "6.2" data-path = "ch6/ch6-02.html" >
< a href = "../ch6/ch6-02.html" >
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< b > 6.2.< / b >
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基於指針對象的方法
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< li class = "chapter " data-level = "6.3" data-path = "ch6/ch6-03.html" >
< a href = "../ch6/ch6-03.html" >
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< b > 6.3.< / b >
通過嵌入結構體來擴展類型
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< li class = "chapter " data-level = "6.4" data-path = "ch6/ch6-04.html" >
< a href = "../ch6/ch6-04.html" >
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< b > 6.4.< / b >
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方法值和方法表達式
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< / a >
< / li >
< li class = "chapter " data-level = "6.5" data-path = "ch6/ch6-05.html" >
< a href = "../ch6/ch6-05.html" >
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< b > 6.5.< / b >
示例: Bit數組
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< li class = "chapter " data-level = "6.6" data-path = "ch6/ch6-06.html" >
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< b > 6.6.< / b >
封裝
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< b > 7.< / b >
接口
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< li class = "chapter " data-level = "7.1" data-path = "ch7/ch7-01.html" >
< a href = "../ch7/ch7-01.html" >
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< b > 7.1.< / b >
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接口是合約
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< li class = "chapter " data-level = "7.2" data-path = "ch7/ch7-02.html" >
< a href = "../ch7/ch7-02.html" >
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< b > 7.2.< / b >
接口類型
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< li class = "chapter " data-level = "7.3" data-path = "ch7/ch7-03.html" >
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< b > 7.3.< / b >
實現接口的條件
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< li class = "chapter " data-level = "7.4" data-path = "ch7/ch7-04.html" >
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< b > 7.4.< / b >
flag.Value接口
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< b > 7.5.< / b >
接口值
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< li class = "chapter " data-level = "7.6" data-path = "ch7/ch7-06.html" >
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< b > 7.6.< / b >
sort.Interface接口
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< b > 7.7.< / b >
http.Handler接口
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< li class = "chapter " data-level = "7.8" data-path = "ch7/ch7-08.html" >
< a href = "../ch7/ch7-08.html" >
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< b > 7.8.< / b >
error接口
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< li class = "chapter " data-level = "7.9" data-path = "ch7/ch7-09.html" >
< a href = "../ch7/ch7-09.html" >
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< b > 7.9.< / b >
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示例: 表達式求值
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< b > 7.10.< / b >
類型斷言
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< b > 7.11.< / b >
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基於類型斷言識别錯誤類型
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< b > 7.12.< / b >
通過類型斷言査詢接口
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< li class = "chapter " data-level = "7.13" data-path = "ch7/ch7-13.html" >
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< b > 7.13.< / b >
類型分支
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< li class = "chapter " data-level = "7.14" data-path = "ch7/ch7-14.html" >
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< b > 7.14.< / b >
示例: 基於標記的XML解碼
< / a >
< / li >
< li class = "chapter " data-level = "7.15" data-path = "ch7/ch7-15.html" >
< a href = "../ch7/ch7-15.html" >
< i class = "fa fa-check" > < / i >
< b > 7.15.< / b >
補充幾點
< / a >
< / li >
< / ul >
< / li >
< li class = "chapter " data-level = "8" data-path = "ch8/ch8.html" >
< a href = "../ch8/ch8.html" >
< i class = "fa fa-check" > < / i >
< b > 8.< / b >
Goroutines和Channels
< / a >
< ul class = "articles" >
< li class = "chapter " data-level = "8.1" data-path = "ch8/ch8-01.html" >
< a href = "../ch8/ch8-01.html" >
< i class = "fa fa-check" > < / i >
< b > 8.1.< / b >
Goroutines
< / a >
< / li >
< li class = "chapter " data-level = "8.2" data-path = "ch8/ch8-02.html" >
< a href = "../ch8/ch8-02.html" >
< i class = "fa fa-check" > < / i >
< b > 8.2.< / b >
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示例: 併發的Clock服務
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< / a >
< / li >
< li class = "chapter " data-level = "8.3" data-path = "ch8/ch8-03.html" >
< a href = "../ch8/ch8-03.html" >
< i class = "fa fa-check" > < / i >
< b > 8.3.< / b >
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示例: 併發的Echo服務
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< / a >
< / li >
< li class = "chapter " data-level = "8.4" data-path = "ch8/ch8-04.html" >
< a href = "../ch8/ch8-04.html" >
< i class = "fa fa-check" > < / i >
< b > 8.4.< / b >
Channels
< / a >
< / li >
< li class = "chapter " data-level = "8.5" data-path = "ch8/ch8-05.html" >
< a href = "../ch8/ch8-05.html" >
< i class = "fa fa-check" > < / i >
< b > 8.5.< / b >
併行的循環
< / a >
< / li >
< li class = "chapter " data-level = "8.6" data-path = "ch8/ch8-06.html" >
< a href = "../ch8/ch8-06.html" >
< i class = "fa fa-check" > < / i >
< b > 8.6.< / b >
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示例: 併發的Web爬蟲
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< / a >
< / li >
< li class = "chapter " data-level = "8.7" data-path = "ch8/ch8-07.html" >
< a href = "../ch8/ch8-07.html" >
< i class = "fa fa-check" > < / i >
< b > 8.7.< / b >
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基於select的多路複用
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< / a >
< / li >
< li class = "chapter " data-level = "8.8" data-path = "ch8/ch8-08.html" >
< a href = "../ch8/ch8-08.html" >
< i class = "fa fa-check" > < / i >
< b > 8.8.< / b >
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示例: 併發的字典遍歷
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< / a >
< / li >
< li class = "chapter " data-level = "8.9" data-path = "ch8/ch8-09.html" >
< a href = "../ch8/ch8-09.html" >
< i class = "fa fa-check" > < / i >
< b > 8.9.< / b >
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併發的退齣
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< / a >
< / li >
< li class = "chapter " data-level = "8.10" data-path = "ch8/ch8-10.html" >
< a href = "../ch8/ch8-10.html" >
< i class = "fa fa-check" > < / i >
< b > 8.10.< / b >
示例: 聊天服務
< / a >
< / li >
< / ul >
< / li >
< li class = "chapter " data-level = "9" data-path = "ch9/ch9.html" >
< a href = "../ch9/ch9.html" >
< i class = "fa fa-check" > < / i >
< b > 9.< / b >
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基於共享變量的併發
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< / a >
< ul class = "articles" >
< li class = "chapter " data-level = "9.1" data-path = "ch9/ch9-01.html" >
< a href = "../ch9/ch9-01.html" >
< i class = "fa fa-check" > < / i >
< b > 9.1.< / b >
競爭條件
< / a >
< / li >
< li class = "chapter " data-level = "9.2" data-path = "ch9/ch9-02.html" >
< a href = "../ch9/ch9-02.html" >
< i class = "fa fa-check" > < / i >
< b > 9.2.< / b >
sync.Mutex互斥鎖
< / a >
< / li >
< li class = "chapter " data-level = "9.3" data-path = "ch9/ch9-03.html" >
< a href = "../ch9/ch9-03.html" >
< i class = "fa fa-check" > < / i >
< b > 9.3.< / b >
sync.RWMutex讀寫鎖
< / a >
< / li >
< li class = "chapter " data-level = "9.4" data-path = "ch9/ch9-04.html" >
< a href = "../ch9/ch9-04.html" >
< i class = "fa fa-check" > < / i >
< b > 9.4.< / b >
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內存同步
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< / a >
< / li >
< li class = "chapter " data-level = "9.5" data-path = "ch9/ch9-05.html" >
< a href = "../ch9/ch9-05.html" >
< i class = "fa fa-check" > < / i >
< b > 9.5.< / b >
sync.Once初始化
< / a >
< / li >
< li class = "chapter " data-level = "9.6" data-path = "ch9/ch9-06.html" >
< a href = "../ch9/ch9-06.html" >
< i class = "fa fa-check" > < / i >
< b > 9.6.< / b >
競爭條件檢測
< / a >
< / li >
< li class = "chapter " data-level = "9.7" data-path = "ch9/ch9-07.html" >
< a href = "../ch9/ch9-07.html" >
< i class = "fa fa-check" > < / i >
< b > 9.7.< / b >
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示例: 併發的非阻塞緩存
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< / a >
< / li >
< li class = "chapter " data-level = "9.8" data-path = "ch9/ch9-08.html" >
< a href = "../ch9/ch9-08.html" >
< i class = "fa fa-check" > < / i >
< b > 9.8.< / b >
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Goroutines和線程
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< / a >
< / li >
< / ul >
< / li >
< li class = "chapter " data-level = "10" data-path = "ch10/ch10.html" >
< a href = "../ch10/ch10.html" >
< i class = "fa fa-check" > < / i >
< b > 10.< / b >
包和工具
< / a >
< ul class = "articles" >
< li class = "chapter " data-level = "10.1" data-path = "ch10/ch10-01.html" >
< a href = "../ch10/ch10-01.html" >
< i class = "fa fa-check" > < / i >
< b > 10.1.< / b >
簡介
< / a >
< / li >
< li class = "chapter " data-level = "10.2" data-path = "ch10/ch10-02.html" >
< a href = "../ch10/ch10-02.html" >
< i class = "fa fa-check" > < / i >
< b > 10.2.< / b >
導入路徑
< / a >
< / li >
< li class = "chapter " data-level = "10.3" data-path = "ch10/ch10-03.html" >
< a href = "../ch10/ch10-03.html" >
< i class = "fa fa-check" > < / i >
< b > 10.3.< / b >
包聲明
< / a >
< / li >
< li class = "chapter " data-level = "10.4" data-path = "ch10/ch10-04.html" >
< a href = "../ch10/ch10-04.html" >
< i class = "fa fa-check" > < / i >
< b > 10.4.< / b >
導入聲明
< / a >
< / li >
< li class = "chapter " data-level = "10.5" data-path = "ch10/ch10-05.html" >
< a href = "../ch10/ch10-05.html" >
< i class = "fa fa-check" > < / i >
< b > 10.5.< / b >
匿名導入
< / a >
< / li >
< li class = "chapter " data-level = "10.6" data-path = "ch10/ch10-06.html" >
< a href = "../ch10/ch10-06.html" >
< i class = "fa fa-check" > < / i >
< b > 10.6.< / b >
包和命名
< / a >
< / li >
< li class = "chapter " data-level = "10.7" data-path = "ch10/ch10-07.html" >
< a href = "../ch10/ch10-07.html" >
< i class = "fa fa-check" > < / i >
< b > 10.7.< / b >
工具
< / a >
< / li >
< / ul >
< / li >
< li class = "chapter " data-level = "11" data-path = "ch11/ch11.html" >
< a href = "../ch11/ch11.html" >
< i class = "fa fa-check" > < / i >
< b > 11.< / b >
測試
< / a >
< ul class = "articles" >
< li class = "chapter " data-level = "11.1" data-path = "ch11/ch11-01.html" >
< a href = "../ch11/ch11-01.html" >
< i class = "fa fa-check" > < / i >
< b > 11.1.< / b >
go test
< / a >
< / li >
< li class = "chapter " data-level = "11.2" data-path = "ch11/ch11-02.html" >
< a href = "../ch11/ch11-02.html" >
< i class = "fa fa-check" > < / i >
< b > 11.2.< / b >
測試函數
< / a >
< / li >
< li class = "chapter " data-level = "11.3" data-path = "ch11/ch11-03.html" >
< a href = "../ch11/ch11-03.html" >
< i class = "fa fa-check" > < / i >
< b > 11.3.< / b >
測試覆蓋率
< / a >
< / li >
< li class = "chapter " data-level = "11.4" data-path = "ch11/ch11-04.html" >
< a href = "../ch11/ch11-04.html" >
< i class = "fa fa-check" > < / i >
< b > 11.4.< / b >
基準測試
< / a >
< / li >
< li class = "chapter " data-level = "11.5" data-path = "ch11/ch11-05.html" >
< a href = "../ch11/ch11-05.html" >
< i class = "fa fa-check" > < / i >
< b > 11.5.< / b >
剖析
< / a >
< / li >
< li class = "chapter " data-level = "11.6" data-path = "ch11/ch11-06.html" >
< a href = "../ch11/ch11-06.html" >
< i class = "fa fa-check" > < / i >
< b > 11.6.< / b >
示例函數
< / a >
< / li >
< / ul >
< / li >
< li class = "chapter " data-level = "12" data-path = "ch12/ch12.html" >
< a href = "../ch12/ch12.html" >
< i class = "fa fa-check" > < / i >
< b > 12.< / b >
反射
< / a >
< ul class = "articles" >
< li class = "chapter " data-level = "12.1" data-path = "ch12/ch12-01.html" >
< a href = "../ch12/ch12-01.html" >
< i class = "fa fa-check" > < / i >
< b > 12.1.< / b >
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爲何需要反射?
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< / a >
< / li >
< li class = "chapter " data-level = "12.2" data-path = "ch12/ch12-02.html" >
< a href = "../ch12/ch12-02.html" >
< i class = "fa fa-check" > < / i >
< b > 12.2.< / b >
reflect.Type和reflect.Value
< / a >
< / li >
< li class = "chapter " data-level = "12.3" data-path = "ch12/ch12-03.html" >
< a href = "../ch12/ch12-03.html" >
< i class = "fa fa-check" > < / i >
< b > 12.3.< / b >
Display遞歸打印
< / a >
< / li >
< li class = "chapter " data-level = "12.4" data-path = "ch12/ch12-04.html" >
< a href = "../ch12/ch12-04.html" >
< i class = "fa fa-check" > < / i >
< b > 12.4.< / b >
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示例: 編碼S表達式
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< / a >
< / li >
< li class = "chapter " data-level = "12.5" data-path = "ch12/ch12-05.html" >
< a href = "../ch12/ch12-05.html" >
< i class = "fa fa-check" > < / i >
< b > 12.5.< / b >
通過reflect.Value脩改值
< / a >
< / li >
< li class = "chapter " data-level = "12.6" data-path = "ch12/ch12-06.html" >
< a href = "../ch12/ch12-06.html" >
< i class = "fa fa-check" > < / i >
< b > 12.6.< / b >
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示例: 解碼S表達式
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< / a >
< / li >
< li class = "chapter " data-level = "12.7" data-path = "ch12/ch12-07.html" >
< a href = "../ch12/ch12-07.html" >
< i class = "fa fa-check" > < / i >
< b > 12.7.< / b >
穫取結構體字段標識
< / a >
< / li >
< li class = "chapter " data-level = "12.8" data-path = "ch12/ch12-08.html" >
< a href = "../ch12/ch12-08.html" >
< i class = "fa fa-check" > < / i >
< b > 12.8.< / b >
顯示一個類型的方法集
< / a >
< / li >
< li class = "chapter " data-level = "12.9" data-path = "ch12/ch12-09.html" >
< a href = "../ch12/ch12-09.html" >
< i class = "fa fa-check" > < / i >
< b > 12.9.< / b >
幾點忠告
< / a >
< / li >
< / ul >
< / li >
< li class = "chapter " data-level = "13" data-path = "ch13/ch13.html" >
< a href = "../ch13/ch13.html" >
< i class = "fa fa-check" > < / i >
< b > 13.< / b >
底層編程
< / a >
< ul class = "articles" >
< li class = "chapter " data-level = "13.1" data-path = "ch13/ch13-01.html" >
< a href = "../ch13/ch13-01.html" >
< i class = "fa fa-check" > < / i >
< b > 13.1.< / b >
unsafe.Sizeof, Alignof 和 Offsetof
< / a >
< / li >
< li class = "chapter " data-level = "13.2" data-path = "ch13/ch13-02.html" >
< a href = "../ch13/ch13-02.html" >
< i class = "fa fa-check" > < / i >
< b > 13.2.< / b >
unsafe.Pointer
< / a >
< / li >
< li class = "chapter " data-level = "13.3" data-path = "ch13/ch13-03.html" >
< a href = "../ch13/ch13-03.html" >
< i class = "fa fa-check" > < / i >
< b > 13.3.< / b >
示例: 深度相等判斷
< / a >
< / li >
< li class = "chapter " data-level = "13.4" data-path = "ch13/ch13-04.html" >
< a href = "../ch13/ch13-04.html" >
< i class = "fa fa-check" > < / i >
< b > 13.4.< / b >
通過cgo調用C代碼
< / a >
< / li >
< li class = "chapter " data-level = "13.5" data-path = "ch13/ch13-05.html" >
< a href = "../ch13/ch13-05.html" >
< i class = "fa fa-check" > < / i >
< b > 13.5.< / b >
幾點忠告
< / a >
< / li >
< / ul >
< / li >
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< li class = "chapter " data-level = "14" data-path = "CONTRIBUTORS.html" >
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2015-12-24 06:47:06 +00:00
< a href = "../CONTRIBUTORS.html" >
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< i class = "fa fa-check" > < / i >
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< b > 14.< / b >
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附録
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< / a >
< / li >
< li class = "divider" > < / li >
< li >
< a href = "https://www.gitbook.com" target = "blank" class = "gitbook-link" >
本書使用 GitBook 釋出
< / a >
< / li >
< / ul >
< / nav >
< / div >
< div class = "book-body" >
< div class = "body-inner" >
< div class = "book-header" role = "navigation" >
<!-- Actions Left -->
<!-- Title -->
< h1 >
< i class = "fa fa-circle-o-notch fa-spin" > < / i >
< a href = "../" > Go编程语言< / a >
< / h1 >
< / div >
< div class = "page-wrapper" tabindex = "-1" role = "main" >
< div class = "page-inner" >
< section class = "normal" id = "section-" >
< h2 id = "go語言項目" > Go語 言 項 目 < / h2 >
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< p > 所 有 的 編 程 語 言 都 反 映 了 語 言 設 計 者 對 編 程 哲 學 的 反 思 ， 通 常 包 括 之 前 的 語 言 所 暴 露 的 一 些 不 足 地 方 的 改 進 。 Go項 目 是 在 Google公 司 維 護 超 級 複 雜 的 幾 個 軟 件 繫 統 遇 到 的 一 些 問 題 的 反 思 （ 但 是 這 類 問 題 絶 不 是 Google公 司 所 特 有 的 ） 。 < / p >
< p > 正 如 Rob Pike所 説 ， “ 軟 件 的 複 雜 性 是 乘 法 級 相 關 的 ” ， 通 過 增 加 一 個 部 分 的 複 雜 性 來 脩 複 問 題 通 常 將 慢 慢 地 增 加 其 他 部 分 的 複 雜 性 。 通 過 增 加 功 能 和 選 項 和 配 置 是 脩 複 問 題 的 最 快 的 途 徑 ， 但 是 這 很 容 易 讓 人 忘 記 簡 潔 的 內 涵 ， 卽 使 從 長 遠 來 看 ， 簡 潔 依 然 是 好 軟 件 的 關 鍵 因 素 。 < / p >
< p > 簡 潔 的 設 計 需 要 在 工 作 開 始 的 時 候 舍 棄 不 必 要 的 想 法 ， 併 且 在 軟 件 的 生 命 週 期 內 嚴 格 區 别 好 的 改 變 或 壞 的 改 變 。 通 過 足 夠 的 努 力 ， 一 個 好 的 改 變 可 以 在 不 破 壞 原 有 完 整 概 念 的 前 提 下 保 持 自 適 應 ， 正 如 Fred Brooks所 説 的 “ 概 念 完 整 性 ” ； 而 一 個 壞 的 改 變 則 不 能 達 到 這 個 效 果 ， 它 們 僅 僅 是 通 過 膚 淺 的 和 簡 單 的 妥 協 來 破 壞 原 有 設 計 的 一 致 性 。 隻 有 通 過 簡 潔 的 設 計 ， 纔 能 讓 一 個 繫 統 保 持 穩 定 、 安 全 和 持 續 的 進 化 。 < / p >
< p > Go項 目 包 括 編 程 語 言 本 身 ， 附 帶 了 相 關 的 工 具 和 標 準 庫 ， 最 後 但 併 非 代 表 不 重 要 的 ， 關 於 簡 潔 編 程 哲 學 的 宣 言 。 就 事 後 諸 葛 的 角 度 來 看 ， Go語 言 的 這 些 地 方 都 做 的 還 不 錯 ： 擁 有 自 動 垃 圾 迴 收 、 一 個 包 繫 統 、 函 數 作 爲 一 等 公 民 、 詞 法 作 用 域 、 繫 統 調 用 接 口 、 隻 讀 的 UTF8字 符 串 等 。 但 是 Go語 言 本 身 隻 有 很 少 的 特 性 ， 也 不 太 可 能 添 加 太 多 的 特 性 。 例 如 ， 它 沒 有 隱 式 的 數 值 轉 換 ， 沒 有 構 造 函 數 和 析 構 函 數 ， 沒 有 運 算 符 重 載 ， 沒 有 默 認 參 數 ， 也 沒 有 繼 承 ， 沒 有 泛 型 ， 沒 有 異 常 ， 沒 有 宏 ， 沒 有 函 數 脩 飾 ， 更 沒 有 線 程 局 部 存 儲 。 但 是 語 言 本 身 是 成 熟 和 穩 定 的 ， 而 且 承 諾 保 證 向 後 兼 容 ： 用 之 前 的 Go語 言 編 寫 程 序 可 以 用 新 版 本 的 Go語 言 編 譯 器 和 標 準 庫 直 接 構 建 而 不 需 要 脩 改 代 碼 。 < / p >
< p > Go語 言 有 足 夠 的 類 型 繫 統 以 避 免 動 態 語 言 中 那 些 粗 心 的 類 型 錯 誤 ， 但 是 Go語 言 的 類 型 繫 統 相 比 傳 統 的 強 類 型 語 言 又 要 簡 潔 很 多 。 雖 然 有 時 候 這 會 導 致 一 個 “ 無 類 型 ” 的 抽 象 類 型 概 念 ， 但 是 Go語 言 程 序 員 併 不 需 要 像 C++或 Haskell程 序 員 那 樣 糾 結 於 具 體 類 型 的 安 全 屬 性 。 在 實 踐 中 Go語 言 簡 潔 的 類 型 繫 統 給 了 程 序 員 帶 來 了 更 多 的 安 全 性 和 更 好 的 運 行 時 性 能 。 < / p >
< p > Go語 言 鼓 勵 當 代 計 算 機 繫 統 設 計 的 原 則 ， 特 别 是 局 部 的 重 要 性 。 它 的 內 置 數 據 類 型 和 大 多 數 的 準 庫 數 據 結 構 都 經 過 精 心 設 計 而 避 免 顯 式 的 初 始 化 或 隱 式 的 構 造 函 數 ， 因 爲 很 少 的 內 存 分 配 和 內 存 初 始 化 代 碼 被 隱 藏 在 庫 代 碼 中 了 。 Go語 言 的 聚 合 類 型 （ 結 構 體 和 數 組 ） 可 以 直 接 操 作 它 們 的 元 素 ， 隻 需 要 更 少 的 存 儲 空 間 、 更 少 的 內 存 分 配 ， 而 且 指 針 操 作 比 其 他 間 接 操 作 的 語 言 也 更 有 效 率 。 由 於 現 代 計 算 機 是 一 個 併 行 的 機 器 ， Go語 言 提 供 了 基 於 CSP的 併 發 特 性 支 持 。 Go語 言 的 動 態 棧 使 得 輕 量 級 線 程 goroutine的 初 始 棧 可 以 很 小 ， 因 此 創 建 一 個 goroutine的 代 價 很 小 ， 創 建 百 萬 級 的 goroutine完 全 是 可 行 的 。 < / p >
< p > Go語 言 的 標 準 庫 （ 通 常 被 稱 爲 語 言 自 帶 的 電 池 ） ， 提 供 了 清 晰 的 構 建 模 塊 和 公 共 接 口 ， 包 含 I/O操 作 、 文 本 處 理 、 圖 像 、 密 碼 學 、 網 絡 和 分 布 式 應 用 程 序 等 ， 併 支 持 許 多 標 準 化 的 文 件 格 式 和 編 解 碼 協 議 。 庫 和 工 具 使 用 了 大 量 的 約 定 來 減 少 額 外 的 配 置 和 解 釋 ， 從 而 最 終 簡 化 程 序 的 邏 輯 ， 而 且 每 個 Go程 序 結 構 都 是 如 此 的 相 似 ， 因 此 Go程 序 也 很 容 易 學 習 。 使 用 Go語 言 自 帶 工 具 構 建 Go語 言 項 目 隻 需 要 使 用 文 件 名 和 標 識 符 名 稱 , 一 個 偶 爾 的 特 殊 註 釋 來 確 定 所 有 的 庫 、 可 執 行 文 件 、 測 試 、 基 準 測 試 、 例 子 、 以 及 特 定 於 平 颱 的 變 量 、 項 目 的 文 檔 等 ； Go語 言 源 代 碼 本 身 就 包 含 了 構 建 規 范 。 < / p >
2015-12-09 07:57:17 +00:00
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