Rails 3: Multiply each char of a string

Given a string @t = "123456789", how can I cycle each char of the string and multiply i开发者_开发知识库t by a defined number?

I've tried @t[0].to_i * number.

thanks

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@t = "123456789".split(//)
@t[0].to_i * number

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You can use the each_char block method:

num = 2
@t = "123456789"
@t.each_char {|ch| puts(ch.to_i * num) }

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@t.chars{|c| puts c.to_i * 5 }
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If you are just wanting to print them out then this works.

@t.chars {|c| puts c.to_i * number} 

If you are wanting to make it a new string then

@t.chars.map { |c| c.to_i  * number }.join

Some References that may help you.

For the first .chars method in http://www.ruby-doc.org/core/classes/String.html

For the second .chars returns a enumerator that .map can be called on. http://www.ruby-doc.org/core/classes/Enumerable.html

Hope this helps.