（ruby）String Extensions(字符串、首字母大写,复数单数转换)

字符串截取，
英文单词单数复数转换(Agile Web Development with Rails ［Chapter 15||||||||||||||Active Support［P251］)
ruby 代码

string = "Now is the time"
puts string.at(2)        #=> "w"
puts string.from(8)      #=> "he time"
puts string.to(8)        #=> "Now is th"
puts string.first        #=> "N"
puts string.first(3)     #=> "Now"
puts string.last         #=> "e"
puts string.last(4)      #=> "time"
puts string.starts_with?("No" )   #=> true
puts string.ends_with?("ME" )     #=> false
count = Hash.new(0)
string.each_char {|ch| count[ch] += 1}
puts count.inspect       #=> {" "=>3, "w"=>1, "m"=>1, "N"=>1, "o"=>1,
                              "e" =>2, "h" =>1, "s" =>1, "t" =>2, "i" =>2}
Active Support adds methods to all strings to support the way Rails itself
converts names from singular to plural, lowercase to mixed case, and so on. A
few of these might be useful in the average application.
     "cat".pluralize
puts                               #=> cats
     "cats".pluralize
puts                               #=> cats
     "erratum".pluralize
puts                               #=> errata
     "cats".singularize
puts                               #=> cat
     "errata".singularize
puts                               #=> erratum
     "first_name".humanize
puts                               #=> "First name"
     "now is the time".titleize
puts                               #=> "Now Is The Time"

评论

2 楼 xu_ch 2009-06-15  

有没有helper?

1 楼 xu_wccq 2007-10-31  

为方法定义别名：

def create
......................
end

alias_method :self_create, :create
alias_method :delegate_create, :create