ruby.txt

What's the naming convention for local variables?

`userDetails`

* `user_details`

`UserDetails`

`USER_DETAILS`

=
What's the naming convention for classes and their files?

`user_detail` class in `user_detail.rb` file

`UserDetail` class in `UserDetail.rb` file

* `UserDetail` in `user_detail.rb` file

`user_detail` class in `UserDetail.rb` file

=
How to define a getter and setter for an instance variable @name?

*```ruby
def name
  @name
end
def name=(name)
  @name = name
end
```

*```ruby
attr_accessor :name
```

```ruby
attr_rw :name
```

```
def getName
  @name
end
def setName(name)
  @name = name
end
```

=
What's the output of the following program:
```ruby
name = ""
if ! name
  puts "The name is not specified"
elsif name == ""
  puts "The name is empty"
else
  puts "The name is #{name}"
end
```

* The name is empty

The name not specified

The name is 

=
What is the proper way of writing conditions?

*```ruby
if name.empty?
  puts "The name is empty"
end
```

*```ruby
puts "The name is empty" if name.empty?
```

```ruby
if name.empty? {
  puts "The name is empty"
}
```

```ruby
if(name.empty?) {
  puts "The name is empty"
}
```

=
Which of these options contains a global variable:

*`$names`

`@names`

`names` defined outside of any method or class

`@@names`

`$$names`

=
Which of these options contains an instance variable:

`$names`

*`@names`

`names` defined outside of any method of the class

`@@names`

`$$names`

=
Given the following code:
```ruby
class Hello
  def world
    "Hello #{@world}"
  end
end
```
`Hello.new.world` will evaluate to:

*`"Hello "`

"Hello nil"

Exception will be raised because `@world` was not defined anywhere