Cookpad Code Puzzle 2022

Goal

You can run the Ruby code on a modern browser like Google Chrome. Try to press "Run Ruby" button.
Observe the behavior of method func1 and define a method answer1 that performs the same behavior as func1.

Code

# You can call `func1`

p func1(0)  #=> 1
p func1(1)  #=> 2
p func1(2)  #=> 3

# Can you tell how `func1` is defined?
# Hint: def func1(n) = n + ???

# Define `answer1` that works like `func1`
def answer1(n)
  n
end

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# You can call `func1`
​
p func1(0)  #=> 1
p func1(1)  #=> 2
p func1(2)  #=> 3
​
# Can you tell how `func1` is defined?
# Hint: def func1(n) = n + ???
​
# Define `answer1` that works like `func1`
def answer1(n)
  n
end
​

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Output