From: Florian Gilcher <flo@...>
Date: 2010-12-07T22:41:56+09:00
Subject: Re: How to delay "string" interpretation?


On Dec 7, 2010, at 1:11 PM, Fritz Trapper wrote:

> Suppose the following code:
> 
>   t='#{a} + #{b}'
>   ...
>   a='a';b='b'
> 
> How to cause ruby to interpret t as a "string" to get the result string
> "a + b"?

Well, instead of using the string interpolation syntax, you can use

  String#%

which interpolates a String at runtime.

In Ruby 1.8.7 without additions, you can use it link this:

  "My string contains a %s and a number as string: %s" % ["string", 123]

You can also format that stuff, etc.

In Ruby 1.9.2 and 1.8.7 with certain additions (for example i18n), you can use it like this:

  "My String contrains a %{string} and a number as string: %{integer}" % {:string => "string", :integer => 123}

This allows you to define that string somewhere else and fill it in later on.

Regards,
Florian

--
Florian Gilcher

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