feat(conversions): add hint comments

This commit is contained in:
mokou 2022-07-15 12:34:10 +02:00
parent 8cfedb1673
commit 74f44f55e3
4 changed files with 10 additions and 0 deletions

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@ -1,6 +1,8 @@
// The From trait is used for value-to-value conversions. // The From trait is used for value-to-value conversions.
// If From is implemented correctly for a type, the Into trait should work conversely. // If From is implemented correctly for a type, the Into trait should work conversely.
// You can read more about it at https://doc.rust-lang.org/std/convert/trait.From.html // You can read more about it at https://doc.rust-lang.org/std/convert/trait.From.html
// Execute `rustlings hint from_into` or use the `hint` watch subcommand for a hint.
#[derive(Debug)] #[derive(Debug)]
struct Person { struct Person {
name: String, name: String,

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@ -4,6 +4,8 @@
// Additionally, upon implementing FromStr, you can use the `parse` method // Additionally, upon implementing FromStr, you can use the `parse` method
// on strings to generate an object of the implementor type. // on strings to generate an object of the implementor type.
// You can read more about it at https://doc.rust-lang.org/std/str/trait.FromStr.html // You can read more about it at https://doc.rust-lang.org/std/str/trait.FromStr.html
// Execute `rustlings hint from_str` or use the `hint` watch subcommand for a hint.
use std::num::ParseIntError; use std::num::ParseIntError;
use std::str::FromStr; use std::str::FromStr;
@ -37,6 +39,9 @@ enum ParsePersonError {
// with something like `"4".parse::<usize>()` // with something like `"4".parse::<usize>()`
// 6. If while extracting the name and the age something goes wrong, an error should be returned // 6. If while extracting the name and the age something goes wrong, an error should be returned
// If everything goes well, then return a Result of a Person object // If everything goes well, then return a Result of a Person object
//
// As an aside: `Box<dyn Error>` implements `From<&'_ str>`. This means that if you want to return a
// string error message, you can do so via just using return `Err("my error message".into())`.
impl FromStr for Person { impl FromStr for Person {
type Err = ParsePersonError; type Err = ParsePersonError;

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@ -3,6 +3,8 @@
// Basically, this is the same as From. The main difference is that this should return a Result type // Basically, this is the same as From. The main difference is that this should return a Result type
// instead of the target type itself. // instead of the target type itself.
// You can read more about it at https://doc.rust-lang.org/std/convert/trait.TryFrom.html // You can read more about it at https://doc.rust-lang.org/std/convert/trait.TryFrom.html
// Execute `rustlings hint from_str` or use the `hint` watch subcommand for a hint.
use std::convert::{TryFrom, TryInto}; use std::convert::{TryFrom, TryInto};
#[derive(Debug, PartialEq)] #[derive(Debug, PartialEq)]

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@ -4,6 +4,7 @@
// //
// The goal is to make sure that the division does not fail to compile // The goal is to make sure that the division does not fail to compile
// and returns the proper type. // and returns the proper type.
// Execute `rustlings hint using_as` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE // I AM NOT DONE