This section describes Perl variable types: Scalar, Array, and Hash. Variable names must be prefixed with special symbols to indicate their types, $, @ and %.
Perl supports 3 types of variables: Scalar, Array, and Hash.
1. Scalar Variable - A variable to hold a scalar value.
The name of a scalar variable must be prefixed with the dollar sign, $,
and followed by an identifier, $identifier.
For example: $price and $url.
2. Array Variable - A variable to hold a list value.
The name of an array variable must be prefixed with the at sign, @,
and followed by an identifier, @identifier.
For example: @orders and @links.
3. Hash Variable - A variable to hold an associative array, which is a special list value -
members are grouped as pairs of keys and values.
The name of an array variable must be prefixed with the percent sign, %,
and followed by an identifier, %identifier.
For example: %priceList and %siteRanks.
Like in many other programming languages, a variable name identifier in Perl is a string
beginning with a letter or underscore, and containing letters, underscores, and digits.
Variables for different data types are in different name spaces.
You could use the same variable identifier for a scalar, an array, and a hash.
