Scalars - Assignment

The equals sign is used to assign a value to a scalar:

    $foo = 4;

Assigns the number 4 to the scalar $foo.  After assignment, you can operate on $foo as if it were the number 4:

    $foo = $foo + 4; # $foo is now 8.

You can change the value of $foo at any time:

    $foo = "cat";