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mirror of https://github.com/rust-lang/rustlings.git synced 2024-12-14 11:22:55 +02:00
rustlings/exercises/conversions
Arkid 34ed235885
fix: Add a deref in the test code
It's virtually impossible to write a the `num_sq` function to take the Box since it doesn't implement `MulAssign`.
2022-09-09 02:40:22 +02:00
..
as_ref_mut.rs fix: Add a deref in the test code 2022-09-09 02:40:22 +02:00
from_into.rs feat(conversions): add hint comments 2022-07-15 12:34:10 +02:00
from_str.rs feat(conversions): add hint comments 2022-07-15 12:34:10 +02:00
README.md docs(exercises): updated all exercises readme files 2021-04-23 19:54:31 +02:00
try_from_into.rs fix(try_from_into): fix function name 2022-07-15 14:08:51 +02:00
using_as.rs feat(conversions): add hint comments 2022-07-15 12:34:10 +02:00

Type conversions

Rust offers a multitude of ways to convert a value of a given type into another type.

The simplest form of type conversion is a type cast expression. It is denoted with the binary operator as. For instance, println!("{}", 1 + 1.0); would not compile, since 1 is an integer while 1.0 is a float. However, println!("{}", 1 as f32 + 1.0) should compile. The exercise using_as tries to cover this.

Rust also offers traits that facilitate type conversions upon implementation. These traits can be found under the convert module. The traits are the following:

Furthermore, the std::str module offers a trait called FromStr which helps with converting strings into target types via the parse method on strings. If properly implemented for a given type Person, then let p: Person = "Mark,20".parse().unwrap() should both compile and run without panicking.

These should be the main ways within the standard library to convert data into your desired types.

Further information

These are not directly covered in the book, but the standard library has a great documentation for it.