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@@ -186,6 +186,31 @@ impl Person {
186} 186}
187``` 187```
188 188
189## Constructors
190
191Prefer `Default` to zero-argument `new` function
192
193```rust
194// Good
195#[derive(Default)]
196struct Foo {
197 bar: Option<Bar>
198}
199
200// Not as good
201struct Foo {
202 bar: Option<Bar>
203}
204
205impl Foo {
206 fn new() -> Foo {
207 Foo { bar: None }
208 }
209}
210```
211
212Prefer `Default` even it has to be implemented manually.
213
189## Avoid Monomorphization 214## Avoid Monomorphization
190 215
191Rust uses monomorphization to compile generic code, meaning that for each instantiation of a generic functions with concrete types, the function is compiled afresh, *per crate*. 216Rust uses monomorphization to compile generic code, meaning that for each instantiation of a generic functions with concrete types, the function is compiled afresh, *per crate*.