From: "David A. Black" <dblack@...>
Date: 2008-04-29T05:10:47+09:00
Subject: Re: Sprintf: what does mean the percent symbol?

Hi --

On Tue, 29 Apr 2008, Toki Toki wrote:

> Hi all!
>
> I'm testing the functionality of sprintf and I know that I can use it in
> two way:
>
> sprintf("%.3f", "1.2345")
> => "1.234"
>
> Or
>
> "%.3f" % "1.2345"
> => "1.234"
>
> In the second example, what does mean the percent symbol (%) between
> "%.3f" and "1.2345"? It means apply format string "%.3f" to string
> "1.2345"? What I want to know is, the percent symbol is limited to
> sprintf or it has a more general use in ruby?
>
> I've searched on the ruby pickaxe and several other ruby books but I
> haven't found anything on the % alone, obviously there are many use of
> that combined with option (array: %w, string: %q,%Q, regexp: %r, ...).

You can define a % method, which will then be executed when you use
the infix %.


David

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