#{ } 在 Ruby 中的含义? [英] Meaning of #{ } in Ruby?

问题描述

操作 #{ } 看起来非常基本，以至于我的 Ruby 书完全跳过了它的定义.有人能解释一下吗?

The operation #{ } appears to be so fundamental that my Ruby book completely skips its definition. Can someone provide an explanation?

推荐答案

为什么这是个好问题

除非您知道正确的搜索词，否则这对 Google 来说是一个棘手的问题.#{} 运算符在技术上执行字符串文字内的表达式替换.

Why This Is a Good Question

This is a tough question to Google for unless you know the right search terms. The #{} operator technically performs expression substitution inside a string literal.

#{} 文字是用于双引号字符串内插值的运算符，与反引号或 $() 相同构造将在 Bash 中使用.从实际的角度来看，对字面量内部的表达式求值，然后将整个#{} 表达式(包括运算符和它包含的表达式)替换原位em> 结果.

The #{} literal is the operator used for interpolation inside double-quoted strings the same way that the backticks or $() construct would be used in Bash. From a practical point of view, the expression inside the literal is evaluated, and then the entire #{} expression (including both the operator and the expression it contains) is replaced in situ with the result.

• http://www.ruby-doc.org/docs/ruby-doc-bundle/Manual/man-1.4/syntax.html#string
• http://www.ruby-doc.org/docs/编程Ruby/html/language.html
• http://en.wikibooks.org/wiki/Ruby_Programming/Syntax/文字#Interpolation
• Ruby (on Rails) 语法

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