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:
I just followed Rust Design Pattern - Strategy (aka Policy).
Simple explanation Make code abstract as possible.
… given an algorithm solving a particular problem, we define only the skeleton of the algorithm at an abstract level, and we separate the specific algorithm’s implementation into different parts.
The stragety pattern are used frequently with dependency inversion (it is also related with high level modules).
Example Code use std::collections::HashMap; type Data = HashMap<String, u32>; trait Formatter { fn format(&self, data: &Data, buf: &mut String); } struct Report; impl Report { fn generate<T: Formatter>(g: T, s: &mut String) { let mut data = HashMap::new(); data.
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.