Rust, Design Patterns, Matrix Factorization, Numerical Methods, Software Engineering.
variable_2: None } } fn variable_1(mut self, variable_1: Type_1) -> Self { // condition to accept the value self.variable_1 = if condition_1(variable_1) { Some(variable_1) } else { None }; self // Useful for chaining ! } /* Implement the same method for variable_2 */ fn build(self) ->