activesupport 学习笔记

#activesupport require ‘active_support/all’

###对ruby core的扩展数组Array Array

###日期时间处理相关 date ###对hash的扩展 require “active_support/all” opts={name: “mlx”, age:23} new_opts={name: “mlx”, age:23, pwd: “brj”}

 puts opts.diff(new_opts)
 #// {:pwd=>"brj"}
 
 puts new_opts.diff(opts)
 #// {:pwd=>"brj"}
 
 puts opts.stringify_keys
 #//{"name"=>"mlx", "age"=>23}

####牛逼的 merge 对Hash的扩展 require ‘active_support/all’ opts={name: “mlx”, age:23} new_opts={name: “mlx”, pwd: “brj”}

puts opts.merge(new_opts)
#//{:name=>"mlx", :age=>23, :pwd=>"brj"}

puts opts.reverse_merge(new_opts)
#//{:name=>"mlx", :pwd=>"brj", :age=>23}

#####注意区别同key 不同value时 merge 结果的区别

opts={name: "brj", age:23}
new_opts={name: "mlx", pwd: "123"}

puts opts.merge(new_opts)
#//{:name=>"mlx", :age=>23, :pwd=>"123"}

puts opts.reverse_merge(new_opts)
#//{:name=>"brj", :pwd=>"123", :age=>23}

***Hash的except方法不会对hash本身做修改如下例***
h1=new_opts.except(:pwd)

puts h1
#//{:name=>"mlx"}

puts new_opts
#//{:name=>"mlx", :pwd=>"123"}

###Integer的扩展比如判断奇偶数(?是方法名称的一部分) puts 1.odd? //true puts 2.even? //true ###Other Other

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