[Ruby] if statement concept of conditional expression

I am reviewing the drill to strengthen my logical thinking. As a beginner, I would appreciate it if you could let me know if you have any questions.

problem

True if the integer entered is less than 2 from a multiple of 10. Other than that, let's create a method that outputs False.

Model answer

def near_ten(num)
  first_place = num % 10
  if first_place <= 2 || first_place >= 8
    puts "True"
  else
    puts "False"
  end
end

Commentary

Focus on the ones place value. "The difference from a multiple of 10 is within 2" means that the ones place is one of "0,1,2,8,9". Therefore, use the modulo % of the four arithmetic operations to get the ones digit, and substitute it for first_place. Andfirst_place <= 2 || first_place >= 8so「0,1,2,8,9」I am checking if it applies to.



There are other ways like this! If anyone can tell me, I would appreciate it if you could point it out! !!

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