[RUBY] Points for refactoring (if statement)

What is refactoring?

Refactoring is the process of improving the source by removing redundant code or rewriting it into versatile and efficient coding.

Key points for refactoring if statements

• If / else order
• Use affirmative form for conditional expression
• Write simple conditions first
• Make the nest shallow

** if / else order ** It is recommended to write the formula of "survey target" whose value changes on the left side and the formula of "comparison target" whose value does not change on the right side.

sample

 if value >= 5
  #Processing content
 end

** for if / else **

• Use affirmative form for conditional expression
• Use "==" rather than "! ="
• Write simple conditions first

# bad
if  a && b == 0
  if c
    #processing
  end
end

# good
if c
  if a && b == 0
    #processing
  end
end

• Make the nest shallow

Nesting is a nested structure There are cases where the if statement is embedded in the if statement to create a nested structure, but the deeper the nesting, the harder it is to read the code, so it is important to try to make it as shallow as possible.