From: Ammar Ali <ammarabuali@...>
Date: 2010-07-13T06:23:42+09:00
Subject: Re: Substitution

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On Mon, Jul 12, 2010 at 11:30 PM, Abder-rahman Ali <
abder.rahman.ali@gmail.com> wrote:
>
> Maybe your solution is a thing I was thinking of.
>

It not a solution really, just the basic syntax.


But, can you kindly tell me how the gsub! method is working on the
> example?


The gsub! does not replace values in the hash, it is operating on the string
that is returned by gets. Consider the following:

str = "Some short string"
puts str  # prints "Some short string"

str.gsub!('short', 'small')
puts str  # prints "Some small string"


Adding some print statements can help you see what is going on. Try running
the following:

info = {
  'Name' => 'Joe',
  'Age' => '20'
}

template = "Name is Age years old"
puts "template = #{template}"

info.each do |key, value|
  puts "replacing #{key} with #{value}"
  template.gsub!(key, value)
  puts "template = #{template}"
end


Hope that helps,
Ammar

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