Built-in Library
Ruby’s built-in library provides you with a rich set of classes
that form the foundation for your Ruby programs. There are classes
for manipulating text (String), operating system
services and abstractions (IO,
File, Process, etc.), numbers
(Integer, Fixnum, etc.), and so
on.
Using these basic building blocks, you can build powerful Ruby programs. But wait, in the next chapter, I lay out the Standard Library, which extends Ruby’s flexibility.
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