diff options
Diffstat (limited to 'exercises/conversions/from_str.rs')
| -rw-r--r-- | exercises/conversions/from_str.rs | 30 |
1 files changed, 18 insertions, 12 deletions
diff --git a/exercises/conversions/from_str.rs b/exercises/conversions/from_str.rs index fe16815..34472c3 100644 --- a/exercises/conversions/from_str.rs +++ b/exercises/conversions/from_str.rs @@ -1,10 +1,13 @@ // from_str.rs -// This is similar to from_into.rs, but this time we'll implement `FromStr` -// and return errors instead of falling back to a default value. -// Additionally, upon implementing FromStr, you can use the `parse` method -// 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 -// Execute `rustlings hint from_str` or use the `hint` watch subcommand for a hint. +// +// This is similar to from_into.rs, but this time we'll implement `FromStr` and +// return errors instead of falling back to a default value. Additionally, upon +// implementing FromStr, you can use the `parse` method 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 +// +// Execute `rustlings hint from_str` or use the `hint` watch subcommand for a +// hint. use std::num::ParseIntError; use std::str::FromStr; @@ -33,15 +36,18 @@ enum ParsePersonError { // Steps: // 1. If the length of the provided string is 0, an error should be returned // 2. Split the given string on the commas present in it -// 3. Only 2 elements should be returned from the split, otherwise return an error +// 3. Only 2 elements should be returned from the split, otherwise return an +// error // 4. Extract the first element from the split operation and use it as the name -// 5. Extract the other element from the split operation and parse it into a `usize` as the age -// with something like `"4".parse::<usize>()` -// 6. If while extracting the name and the age something goes wrong, an error should be returned +// 5. Extract the other element from the split operation and parse it into a +// `usize` as the age with something like `"4".parse::<usize>()` +// 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 // -// 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())`. +// 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 { type Err = ParsePersonError; |