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Edited the newtype

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Tanish-Eagle 2022-12-08 22:17:17 +05:30
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en/src/newtype-sized.md
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@ -26,7 +26,7 @@ fn main() {
} }
``` ```
2. 🌟 Hide the methods of the original type 2. 🌟 Hide the methods of the original type.
```rust,editable ```rust,editable
/* Make it workd */ /* Make it workd */
struct Meters(u32); struct Meters(u32);
@ -41,7 +41,7 @@ fn main() {
} }
``` ```
3. 🌟🌟 The `newtype` idiom gives compile time guarantees that the right type of value is suplied to a program. 3. 🌟🌟 The `newtype` idiom gives compile time guarantees that the right type of value is supplied to a program.
```rust,editable ```rust,editable
/* Make it work */ /* Make it work */
struct Years(i64); struct Years(i64);
@ -61,7 +61,7 @@ impl Days {
} }
} }
// an age verification function that checks age in years, must be given a value of type Years. // An age verification function that checks age in years, must be given a value of type Years.
fn old_enough(age: &Years) -> bool { fn old_enough(age: &Years) -> bool {
age.0 >= 18 age.0 >= 18
} }
@ -98,12 +98,12 @@ fn main() {
assert_eq!(format!("{}",d), "There are still 30 meters left"); assert_eq!(format!("{}",d), "There are still 30 meters left");
} }
/* implement calculate_distance */ /* Implement calculate_distance */
fn calculate_distance fn calculate_distance
``` ```
## Type alias ## Type alias
The most importance of type alias is to improve the readability of our codes. Type alias is important to improve the readability of our code.
```rust ```rust
type Thunk = Box<dyn Fn() + Send + 'static>; type Thunk = Box<dyn Fn() + Send + 'static>;
@ -150,7 +150,7 @@ fn main() {
} }
``` ```
6. 🌟🌟 There are a few preserved alias in Rust, one of which can be used in `impl` blocks. 6. 🌟🌟 There are a few preserved aliases in Rust, one of which can be used in `impl` blocks.
```rust,editable ```rust,editable
enum VeryVerboseEnumOfThingsToDoWithNumbers { enum VeryVerboseEnumOfThingsToDoWithNumbers {
Add, Add,
@ -193,7 +193,7 @@ fn main() {
} }
``` ```
9. 🌟🌟 Trait is also a unsized type 9. 🌟🌟 Trait is also an unsized type
```rust,editable ```rust,editable
/* Make it work in two ways */ /* Make it work in two ways */
use std::fmt::Display; use std::fmt::Display;