Ruby conventions

Question 1

How do you write a single line if statement?

Answer 1

puts “It’s true!” if true

Question 2

How do you write a single line unless statement?

Answer 2

puts ‘Hello’ unless false

Question 3

What is a ternary conditional expression?

Answer 3

A if/else statement is a ternary expression beacuse it takes three arguments:

• A boolean
• a expression to evaluate if the boolean is true
• a expression to evaluate if the boolean is false

boolean ? Do this if true: Do this if false

Question 4

What is a case statement?

Answer 4

A case statement is a if/else statement that is used when there are a lot of conditions to check.

case language
  when "JS" then put "Websites!"
  when "Python" then puts "Science!"
  when "Ruby" then puts "Web apps!"
  else puts "I don't know!"
end

Question 5

What is a conditional assignment?

Answer 5

A conditional assignment assigns a variable to a name if the name is nil

favorite_animal = ‘cat’
favorite_animal | |= ‘dog’
print favorite_animal => cat

favorite_animal = nil
favorite_animal | |= ‘dog’
print favorite_animal => ‘dog’

Question 6

What is a implicit return?

Answer 6

It means that ruby will return a value even though you did not require it.

Question 7

What is a short-circuit evaluation?

Answer 7

It means in a conditional statement with two conditions the second condition is evaluated only when the first condition is not enough to determine the value of expression

false && true

Question 8

What is the concatenation operator?

Answer 8

It is «
and used to push in a element to the end of an array or a string.

[1, 2, 3] &laquo_space;4 => [1, 2, 3, 4]
‘Faraz ‘ &laquo_space;‘Naeem’ => ‘Faraz Naeem’

Question 9

What is string interpolation?

Answer 9

{ x } its when you add a value to a string, no need to convert it.

Question 10

What is refactoring?

Answer 10

Refactoring means that one should make the code simpler and more readable whitout changing its properties or function