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Practical Ruby Gems - Question

 
Ranch Hand
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Hi,

How good does this book compare with Java FX? If I understood this correctly, Gems is for scripting like Java FX?

Can you please provide with a TOC for the book.
 
Greenhorn
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Hi there,

Gems is similar to installing the .JAR files to JRE\LIB\EXT . They(gem libraries) are available for programs using that installation of ruby.

JavaFX : I don't know it well enough to describe it : since you're from the java world, you should be able to grok it.

I hope that answers.

BR,
~A
 
Joe San
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I thought GEMS is some kind of scripting language. Anyways, thanks for answering my post!
 
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Gems are packaging format used for distributing Ruby libraries. Think of it as a java jar file or a python egg. You can install/update these libraries by using the gem command, which will automatically download and install/update/build docs and the dependencies for the gem. It is similar in feel to using Debian's package manager "apt" to install software packages on linux.
 
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Quite right. Note that another excellent advantage of RubyGems is that it's written in pure Ruby, so it runs anywhere Ruby runs. You can install some Ruby libraries with apt-get or Yum, but they are of course distribution specific. (They also typically lag behind the RubyGems distribution.)

Additionally, RubyGems offers versioning - you can request only a certain version of a gem, and you can have multiple versions of the same gem installed at once. This is a nice feature, and means that you can solve versioning issues with nice error messages instead of failing because of a missing method or class.

Take it easy,

David Berube
 
Joe San
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Thanks guys for clarifying!
 
With a little knowledge, a cast iron skillet is non-stick and lasts a lifetime.
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