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how do you use marshal.dump in Ruby please?

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Join Date: Mar 2007

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Gazco

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how do you use marshal.dump in Ruby please?

Apr 22nd, 2007

Hey, I'm learning Ruby and I've just about got it sorted. I have just one (or maybe more) question(s): What is marshal.dump and does it allow you to save data to a file outside of the Ruby program? If not, how do I create saved data (ie. character attributes inside a text-based game)? Thanks for answers!

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pty

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Re: how do you use marshal.dump in Ruby please?

Apr 22nd, 2007

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Originally Posted by Gazco

Hey, I'm learning Ruby and I've just about got it sorted. I have just one (or maybe more) question(s): What is marshal.dump and does it allow you to save data to a file outside of the Ruby program? If not, how do I create saved data (ie. character attributes inside a text-based game)? Thanks for answers!

For some reason the rubycentral site seems to be down so the original article I'd link to isn't available, however it's in the google cache.

Note to self... pocket cup

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IndianGuru IndianGuru is offline

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Re: how do you use marshal.dump in Ruby please?

Apr 22nd, 2007

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Originally Posted by Gazco

Hey, I'm learning Ruby and I've just about got it sorted. I have just one (or maybe more) question(s): What is marshal.dump and does it allow you to save data to a file outside of the Ruby program? If not, how do I create saved data (ie. character attributes inside a text-based game)? Thanks for answers!

You can read this small tutorial here -
http://sitekreator.com/satishtalim/o...alization.html

Hope that helps.

Satish Talim
Learning Ruby

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Join Date: Mar 2007

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Gazco

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Re: how do you use marshal.dump in Ruby please?

Apr 23rd, 2007

Thanks, these sites really helped a lot and answered my questions, but the last one also brought up one little one: in the second example the programmer used

 Help with Code Tags 
 Ruby Syntax (Toggle Plain Text) 
File.open('game', 'w+') do |f|
File.open('game', 'w+') do |f|

What does the string

Help with Code Tags

Ruby Syntax (Toggle Plain Text)

'w+'

do and

Help with Code Tags

Ruby Syntax (Toggle Plain Text)

|f|

do please? Thanks once again for any help.

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Join Date: Oct 2005

Posts: 523

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pty

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Re: how do you use marshal.dump in Ruby please?

Apr 23rd, 2007

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Originally Posted by Gazco

Thanks, these sites really helped a lot and answered my questions, but the last one also brought up one little one: in the second example the programmer used
Help with Code Tags

Ruby Syntax (Toggle Plain Text)
File.open('game', 'w+') do |f|
File.open('game', 'w+') do |f|
What does the string
Help with Code Tags

Ruby Syntax (Toggle Plain Text)
'w+'
'w+'
do and
Help with Code Tags

Ruby Syntax (Toggle Plain Text)
|f|
|f|
do please? Thanks once again for any help.

"w+" is a mode string; it truncates the file (or creates a new one if it doesn't exist)

|f| is a block. Basically it means that in the following code f refers to the file.

A quick example of a simple block:

 Help with Code Tags 
 Ruby Syntax (Toggle Plain Text) 
>> 5.times do |i|
?> puts i.to_s
>> end
0
1
2
3
4
=> 5
>> 5.times do |i|
?> puts i.to_s
>> end
0
1
2
3
4
=> 5