ØThree
categories of data types - scalars,
Ø arrays and hashes
Ø Two categories of scalars - numerics
and
Ø character strings
Ø Everything (even classes) is an
object
Ø Numeric types inherit from the Numeric
class
Ø Float and Integer inherit from
Numeric
Ø Fixnum (32 bits) and Bignum inherit
from
Ø Integer
Ø All string literals are String
objects
Ø The null string may be denoted as "
or as 'ÕÓ.
Ø The String class has over 75 methods