Ruby

Question 1

convert string to integer

Answer 1

.to_i

Question 2

convert number to string

Answer 2

.to_s

Question 3

convert to floating point number

Answer 3

.to_f

Question 4

add an item to the end of an array

Answer 4

array.push

Question 5

remove the last item in an array

Answer 5

array.pop

Question 6

read (but don’t change) the last item in an array

Answer 6

array.last

Question 7

syntax to access value of key in hash

Answer 7

hash_name[:key]

Question 8

alternate syntax to access value of key in hash

Answer 8

hash_name.key

Question 9

define CRUD

Answer 9

Create
Read
Update
Delete

Question 10

How do you tell html.erb code to run ruby code?

Question 11

How do you tell html.erb to show the result of the ruby code in the html?

Answer 11

by adding an = symbol

Question 12

7 R on R controller actions

Answer 12

1. Index
2. Show
3. New
4. Edit
5. Create
6. Update
7. Destroy

Question 13

method to form a string from the items in an array

Answer 13

my_array.join(“ “) # this would add a space between items in the string.

Question 14

what is a range

Answer 14

a range of numbers or letters with two dots between then:

1..30 # numbers between 1 and 30

Question 15

when you call a .each method on a hash and feed it a block, how many variables do you work with?

Answer 15

Two.
You are working with both the key and the key’s value. You don’t have to use them both, though. For example:
my_hash.each { |key, value| value = value + 1 }

Question 16

what does the .inspect method do?

Answer 16

returns a string with the literal value of the object it’s called on

Question 17

Way to return the text plural of an array of objects

Answer 17

pluralize(1, “dog”) => “1 dog”

pluralize(2, “dog”) => “2 dogs”