[RUBY] When you want to use the method outside

【Overview】

1. Conclusion </ b>

2. What is a method </ b>

3. How to use </ b>

4. Another solution </ b>

  1. Conclusion

Use instance variables and instance methods!


2. What is a method

"A fixed way to achieve the purpose. Method. Method"

However, in simple terms, it can be used by attaching it to a variable (instance method), or it refers to an original method such as an equation (length, each, times, etc.)!

When using it outside, the concept of scope comes out. I wrote a little in the article below!

” Difference between variables and instance variables "
3. How to use

Then, what actually happens is as follows.

Relationship between instance methods and instance variables


class Student

 def initialize(gender, height, personality)
  @gender = gender
  @height = height
  @personality = personality
 end
　
 def gender
  @gender
 end

 def height
  @height
 end

 def personality
  @personality
 end

end

student = Student.new("Man", "175cm", "friendly")
puts "sex:#{student.gender}height:#{student.height}Personality:#{student.personality}"

By doing this, you can freely attach methods to variables. It can also be used outside the "def end" (beyond the scope)!


4. Another solution

You can write the same in the method!

Completed within the method


class student

def initialize(gender, height, personality)
  @gender = gender
  @height = height
  @personality = personality
  puts "sex:#{@gender}height:#{@height}#Personality:#{@personality}"
end

student = Student.new("Man", "175cm", "friendly")

You can still use it inside the method!


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