关于# Signs 的Ruby 问题 [英] Ruby question about # Signs

问题描述

如这里所示:http://railstutorial.org/chapters/rails-flavored-ruby#top 用于文件:

As seen here: http://railstutorial.org/chapters/rails-flavored-ruby#top for the file:

app/helpers/application_helper.rb:

app/helpers/application_helper.rb:

module ApplicationHelper

  # Return a title on a per-page basis.
  def title
    base_title = "Ruby on Rails Tutorial Sample App"
    if @title.nil?
      base_title
    else
      "#{base_title} | #{@title}"
    end
  end
end

为什么在 base_title 和 Title 之前有井号?他们在做什么?

Why are there pound signs before base_title and before Title? What are they doing?

推荐答案

这叫做字符串插值.base_title 是一个变量，#{} 字符表示应该替换它的值来代替该标记.

It's called string interpolation. base_title is a variable, and the #{} characters denote that its value should be substituted in place of that marker.

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