defvar

defvar( 
s_varName 
[ g_value ] 
) 
=> g_value / nil

Defines a variable and assign it a value.The variable defined follows the scoping rule.

s_varName	Name of the variable to be defined.
g_value	Value to assign to the variable. If g_value is not given, `nil` is assigned to the variable.

g_value	The value of the defined variable.
`nil`	The variable is not defined.

The following example assigns x a value of 3.

defvar(x 3) 
=> 3