https://rust-unofficial.github.io/patterns/patterns/creational/builder.html
TL;DR Construct an object with calls to a builder helper.
Explain with Rust example: step by step I guess this Pasta example is a bad example… need to be improved
Suppose you define a new struct (I use &str because it is just a snippet, but in real code, you should use String in this case):
struct Pasta<'a> { name: &'a str, tomato: bool, garlic: bool, special_order: &'a str } You can create/initialize an object like below:
Why? String type has generally lots of choices for the values, so it prones to bugs. If your programing language supports strong-typing, you need to consider avoiding Strings as parameters of functions. Strong-typing led you Less bugs and validations. In Rust, it’s called a “newtype pattern”. The trinity, “Good naming (based on DDD) + good typing (struct) + enum”, helps us always. Newtype patterns in Rust https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
use std::ops::Add; struct Millimeters(u32); struct Meters(u32); impl Add<Meters> for Millimeters { type Output = Millimeters; fn add(self, other: Meters) -> Millimeters { Millimeters(self.