双精度是否小于-quot<<-&引用；这个符号在ruby里有什么意思吗？

我试图让自己熟悉ruby语法和编码风格（我是个新手）。我遇到了一段代码，它使用了Ruby中定义多行字符串的各种方法。这是其中之一

> name = 'John'
> city = 'Ny'
> multiline_string = <<-EOS
> This is the first line
> My name is #{name}.
> My city is #{city} city.
> EOS
 => "This is the first line\nMy name is John.\nMy city is Ny city.\n" 
>

有关更多信息，请参阅

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这是ruby-herdoc语法。您可以在这里阅读：在OP的情况下，需要破折号（以允许缩进的结束标记）“它们都支持插值”-不正确。单引号字符串不允许插值。确定完成后，请确保选中此处的一个答案。：）第二个例子是多行字符串的

An。
> name = 'John'
> city = 'Ny'
> multiline_string = <<-EOS
> This is the first line
> My name is #{name}.
> My city is #{city} city.
> EOS
 => "This is the first line\nMy name is John.\nMy city is Ny city.\n" 
>

2.2.1 :014 > <<EOF
2.2.1 :015"> My first line without dash
2.2.1 :016">         EOF
2.2.1 :017"> EOF
 => "My first line without dash\n        EOF\n" 


2.2.1 :018 > <<-EOF
2.2.1 :019"> My first line with dash. This even supports spaces before the ending delimiter.
2.2.1 :020">    EOF
 => "My first line with dash. This even supports spaces before the ending delimiter.\n" 
2.2.1 :021 >