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