ruby 笔记

• ruby的核心
• ruby的platform
• ruby的表达式 操作符和控制流

 

• ruby的platform

范畴	api	注释
String	[] index sub gsub match	参数中可直接使用regexp
	split partition chomp strip
Regexp	=~ split sub gsub
	$~ $1 $& []	线程和method安全
Time Date	Time.now Time.local(2007, 7, 8) t.strftime("%Y-%m-%d %H:%M:%S")	也可以utc
	require 'parsedate'; include ParseDate
Collection	each each_with_index
	collect find select(find_all) reject inject	inject起到了reduce一个array的作用
	sort sort_by group_by(key相同的元素组成一个array)
	include? grep
	key? value? merge(update) invert inspect
File	basename dirname split
	exist? directory? stat
	open delete utime	rwa[+] 用a或者a+即可
Dir	chdir entries("dir") foreach("dir")
	[] glob
I/O	readline each lineno read
	puts printf write
networking	s = TCPSocket.open(host, port) s.gets s.close	require 'socket'
	server = TCPServer.open(port) client = server.accept client .puts client.close	server = TCPServer.open(port) sockets = [server] ready = select(sockets) readable = ready[0] readable.each {|socket|}
	require 'net/http' http = Net::HTTP.new(host) headers, body = http.get(path)

 

 

11. Threads and Processes

ruby的线程 建立在ruby interpreter中 ，同os的线程没关系。这一点类似java虚拟机，就是一个进程里面跑着n个线程。

 

A. 创建线程

Thread.new(*args) {|args| block}

threads = []
for page_to_fetch in pages
  threads << Thread.new(page_to_fetch) do |url|
    puts "share: " + page_to_fetch + ' ' + url
  end
end
threads.each {|thr| thr.join }

 

除了block内的local变量 ，所有线程共享全局、实例和local变量。

 

B. 线程操控

Thread.join, Thread.list

Thread.current[]= 可保存block内变量，并被其他线程访问，使用方法类似hash。