line

‘The  color’.

line

‘The nil color’.

line

‘The red color’.

an

exception is thrown.

create

a new Shape method and make x reference that method.

create

a new Shape class and make x reference that class.

create

a new Shape object and make x reference that object.

create

a new Shape variable and make x reference that variable.

a

reference is a variable which hold address that indicates where an object is stored.

a

reference is a special type for declare classes in Ruby.

a

reference is an instance of a class.

a

reference is a variable which point to initialize method defined in a class.

all

of the above is true.

an

object can be thought of as a factory that makes classes.

an

object is a special type for grouping similar variables.

an

object is an instance of a class.

all of the above is true.

a class

is an instance of an object

a class

can be thought of as a factory that makes objects.

a class is a special type for

grouping similar variables.

It’s a

set of advises how to write Ruby documentation

It’s a

set of advises concerning Ruby coding style

It’s a

set of rules how to use OOP in ruby