Here’s a quiz we ran last year, at Employment.nil, Toronto first Ruby job fair.
See if you can get them all, I’ll post the answers in a couple weeks, and if you have your own favorite trick questions, post them here.
Javascript
1. An external JavaScript must contain the <script> tag, true or false?
2. What is the purpose of the the SWFObject javascript library?
Ruby
3. Given:
a = ‘foo’
b = nil
first = a && b
second = a and b
Are first and second equal?
4. True or false?
5. If ('1'..'10').to_a returns:
["1", "2", "3", "4", ..... "10"]
What does ('2'..'10').to_a return?
Rails
6. Given the following class:
1
2
| class Monkey << ActiveRecord::Base
has_many :bananas, :order => 'size ASC' |
named_scope :starting_from_massive, :order => ‘size DESC’
end
What SQL is generated for the following queries:
1
2
3
| @monkey.bananas
@monkey.bananas.starting_from_massive
@monkey.bananas.all(:order => nil) |
XHTML:
7. The DOCTYPE declaration has no closing tag, true or false?
8. All XHTML tags and attributes must be in lower case, true or false?
9. There is a way of describing XML data, how?
10. What does DTD stand for?
AJAX:
11. AJAX functionality is achieved by using what object?
CSS:
12. Should you clear floats?
13. How do you properly clear floats?
14. How do you write IE specific css?
Bonus: what is the problem with this?
Everything – Multiple Choice
15. Rails: Which of the following is not a form helper method?
a. text_field_tag
b. text_input_tag
c. text_area_tag
d. hidden_field_tag
16. What’s the default REST HTTP action verb for updating an existing record?
a. PUT
b. UPDATE
c. POST
d. PUSH
17. Which of the following is not a core Rails package?
a. ActionMailer
b. ActionController
c. ActiveRecord
d. ActiveResource
18. Which of the following is not an instance method of Object?
a. to_a
b. to_i
c. taint
d. hash
19. Which of the following is not a valid render option?
a. :update
b. :partial
c. :string
d. :file
20. Which of the following is not a valid ActionController filter declaration?
a. before_filter
b. clear_filter
c. after_filter
d. around_filter
21. Which of the following is not a valid ActiveRecord callback type?
a. before_create
b. before_validation_on_create
c. after_destroy
d. before_validation_on_destroy
22. XML is to XHTML as this is to HTML.
23. The keys of a model’s attributes are stored using this data type.
24. This is the RFC 2324 definition for HTTP status code 418.
24. Bonus: what does this do???
1
| data.gsub(/[^\d]/, '').split('').reverse.enum_with_index.collect{|x, i| (i%2!=0)? (x.to_i*2).to_s.split('').inject(0){|sum, i| sum + i.to_i} : x.to_i}.inject(0){|sum, i| sum + i}%10 != 0 |
R or RoR:
—-
1. Ruby:
Given:
a = ‘foo’
b = nil
first = a && b
second = a and b
Are first and second equal?
No. first one equals nil, second equals foo
2. Ruby:
True or false: 1/2 == 0.5
false 1/2 is int, .5 is float
1/2 is equal to zero because it is an int divided by an int, they don’t have the precision to give the correct answer
3. Ruby:
If (’1′..’10′).to_a returns :
["1", "2", "3", "4", ..... "10"]
what does (’2′..’10′).to_a return?
answer: empty array because ’10′ precedes ’2′
It’s ordering by string representation, not integer
4. Rails:
class Monkey << ActiveRecord::Base has_many :bananas, :order => ‘size ASC’
named_scope :starting_from_massive, :order => ‘size DESC’
end
What is the SQL for
@monkey.bananas
@monkey.bananas.starting_from_massive
@monkey.bananas.all(:order => nil)
Answer:
1: select * from monkeys order size ASC
2. select * from monkeys order size ASC, size DESC
3. select * from monkeys order size ASC
5. What does the H in DHH stand for? Spell it?
Hein
—-
4. XHTML:
The DOCTYPE declaration has no closing tag
False
5. All XHTML tags and attributes must be in lower case
true
6. There is a way of describing XML data, how?
Document Type Definition
7. What does DTD stand for?
Document Type Definition
Javascript:
—-
8. What is the purpose of the the swf object javascript library?
To work around the judgement against Microsoft regarding the Eolas patent defining “Embedded Objects Linked Across Systems”.
Ajax:
A little bit tougher now: AJAX functionality is achieved by using what object?
XMLHttpRequest
CSS:
—-
1.
Should you clear floats?
yes
2.
How do you properly clear floats?
overflow: hidden;
_height: 1%;
3.
How do you write ie specific css?
_element are for ie6
*element are for ie7
Bonus: what is the problem with this?
Multiple Choice
Which of the following is not a form helper method?
text_field_tag
text_input_tag
text_area_tag
hidden_field_tag
What’s the default REST HTTP action verb for updating an existing record?
PUT
UPDATE
POST
PUSH
Which of the following is not a core Rails package?
ActionMailer
ActionController
ActiveRecord
ActiveResource
Which of the following is not an instance method of Object?
to_a
to_i
taint
hash
Which of the following is not a valid render option?
:update
:partial
:string
:file
Which of the following is not a valid ActionController filter declaration?
before_filter
clear_filter
after_filter
around_filter
Which of the following is not a valid ActiveRecord callback type?
before_create
before_validation_on_create
after_destroy
before_validation_on_destroy
Simple Answers
This is the “H” in “DHH”.
What is Heinemeier?
(Spelling can count)
XML is to XHTML as this is to HTML.
What is SGML?
The keys of a model’s attributes are stored using this data type.
What is String?
or
What are Strings?
This is the RFC 2324 definition for HTTP status code 418.
What is “I’m a teapot”?
// ]]>
