[Ruby] Assign variables in conditional expressions in if statements.

This is a personal memo.

About what if (x = test) is doing. In ruby, assignment can be used in conditional expressions of variables.

Illustration

if x = test
  p x
end

=> nil

With if x = test, the value of the variable test is assigned to the variable x.

If the variable test from which it is assigned is false, the result will be false.

・ P x "P" is the output. Meaning to output the variable x.

If the variable test has a value, the result of the if statement is true.

test = "test"

if x = test
  p x
end

=> "test"

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