From 5a7cb8ee1d25d9e1ed71b797b419b630695bb7ba Mon Sep 17 00:00:00 2001 From: TimLai666 <43640816+TimLai666@users.noreply.github.com> Date: Tue, 18 Jun 2024 23:37:04 +0800 Subject: [PATCH] =?UTF-8?q?=E7=BF=BB=E8=AD=AF?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- exercises/23_conversions/as_ref_mut.rs | 22 +++++------ exercises/23_conversions/from_into.rs | 52 ++++++++++---------------- 2 files changed, 30 insertions(+), 44 deletions(-) diff --git a/exercises/23_conversions/as_ref_mut.rs b/exercises/23_conversions/as_ref_mut.rs index 2ba9e3f0..70fcd01c 100644 --- a/exercises/23_conversions/as_ref_mut.rs +++ b/exercises/23_conversions/as_ref_mut.rs @@ -1,30 +1,28 @@ // as_ref_mut.rs // -// AsRef and AsMut allow for cheap reference-to-reference conversions. Read more -// about them at https://doc.rust-lang.org/std/convert/trait.AsRef.html and -// https://doc.rust-lang.org/std/convert/trait.AsMut.html, respectively. +// AsRef 和 AsMut 允許進行廉價的引用到引用的轉換。詳細閱讀 https://doc.rust-lang.org/std/convert/trait.AsRef.html 和 +// https://doc.rust-lang.org/std/convert/trait.AsMut.html。 // -// Execute `rustlings hint as_ref_mut` or use the `hint` watch subcommand for a -// hint. +// 執行 `rustlings hint as_ref_mut` 或使用 `hint` 子命令以獲取提示。 // I AM NOT DONE -// Obtain the number of bytes (not characters) in the given argument. -// TODO: Add the AsRef trait appropriately as a trait bound. +// 獲取給定參數中的字節數（不是字符數）。 +// TODO: 適當地將 AsRef trait 作為 trait bound 添加。 fn byte_counter(arg: T) -> usize { arg.as_ref().as_bytes().len() } -// Obtain the number of characters (not bytes) in the given argument. -// TODO: Add the AsRef trait appropriately as a trait bound. +// 獲取給定參數中的字符數（不是字節數）。 +// TODO: 適當地將 AsRef trait 作為 trait bound 添加。 fn char_counter(arg: T) -> usize { arg.as_ref().chars().count() } -// Squares a number using as_mut(). -// TODO: Add the appropriate trait bound. +// 使用 as_mut() 將數字平方。 +// TODO: 添加適當的 trait bound。 fn num_sq(arg: &mut T) { - // TODO: Implement the function body. + // TODO: 實現函數主體。 ??? } diff --git a/exercises/23_conversions/from_into.rs b/exercises/23_conversions/from_into.rs index 11787c37..6f4548bf 100644 --- a/exercises/23_conversions/from_into.rs +++ b/exercises/23_conversions/from_into.rs @@ -1,11 +1,8 @@ // from_into.rs // -// The From trait is used for value-to-value conversions. 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 +// From trait 用於值到值的轉換。如果 From 為某個類型正確實現，那麼 Into trait 應該可以反向工作。可以在 https://doc.rust-lang.org/std/convert/trait.From.html 閱讀更多內容。 // -// Execute `rustlings hint from_into` or use the `hint` watch subcommand for a -// hint. +// 執行 `rustlings hint from_into` 或使用 `hint` 子命令來獲取提示。 #[derive(Debug)] struct Person { @@ -13,8 +10,7 @@ struct Person { age: usize, } -// We implement the Default trait to use it as a fallback -// when the provided string is not convertible into a Person object +// 我們實現 Default trait，以便在提供的字串無法轉換為 Person 物件時用作回退。 impl Default for Person { fn default() -> Person { Person { @@ -24,33 +20,26 @@ impl Default for Person { } } - -// Your task is to complete this implementation in order for the line `let p1 = -// Person::from("Mark,20")` to compile. Please note that you'll need to parse the -// age component into a `usize` with something like `"4".parse::()`. The -// outcome of this needs to be handled appropriately. +// 你的任務是完成此實現，以便讓 `let p1 = Person::from("Mark,20")` 這行代碼可以編譯。請注意，您需要將年齡部分解析為 `usize`，可以使用 `"4".parse::()` 之類的方法。需要適當處理此操作的結果。 // -// Steps: -// 1. If the length of the provided string is 0, then return the default of -// Person. -// 2. Split the given string on the commas present in it. -// 3. Extract the first element from the split operation and use it as the name. -// 4. If the name is empty, then return the default of Person. -// 5. Extract the other element from the split operation and parse it into a -// `usize` as the age. -// If while parsing the age, something goes wrong, then return the default of -// Person Otherwise, then return an instantiated Person object with the results - -// I AM NOT DONE +// 步驟： +// 1. 如果提供的字串長度為 0，則返回 Person 的默認值。 +// 2. 在字串中找到逗號並進行分割。 +// 3. 從分割操作中提取第一個元素，並將其用作名字。 +// 4. 如果名字為空，則返回 Person 的默認值。 +// 5. 從分割操作中提取另一個元素，並將其解析為 `usize` 作為年齡。 +// 如果在解析年齡時出現錯誤，則返回 Person 的默認值。否則，返回具有結果的實例化 Person 物件。 impl From<&str> for Person { - fn from(s: &str) -> Person {} + fn from(s: &str) -> Person { + // TODO: Complete the function body + } } fn main() { - // Use the `from` function + // 使用 `from` 函數 let p1 = Person::from("Mark,20"); - // Since From is implemented for Person, we should be able to use Into + // 由於為 Person 實現了 From，因此我們應該能夠使用 Into let p2: Person = "Gerald,70".into(); println!("{:?}", p1); println!("{:?}", p2); @@ -61,29 +50,28 @@ mod tests { use super::*; #[test] fn test_default() { - // Test that the default person is 30 year old John + // 測試默認的 Person 是否是 30 歲的 John let dp = Person::default(); assert_eq!(dp.name, "John"); assert_eq!(dp.age, 30); } #[test] fn test_bad_convert() { - // Test that John is returned when bad string is provided + // 測試當提供錯誤的字串時是否返回 John let p = Person::from(""); assert_eq!(p.name, "John"); assert_eq!(p.age, 30); } #[test] fn test_good_convert() { - // Test that "Mark,20" works + // 測試 "Mark,20" 是否工作 let p = Person::from("Mark,20"); assert_eq!(p.name, "Mark"); assert_eq!(p.age, 20); } #[test] fn test_bad_age() { - // Test that "Mark,twenty" will return the default person due to an - // error in parsing age + // 測試 "Mark,twenty" 是否會因為解析年齡錯誤回傳默認的 Person let p = Person::from("Mark,twenty"); assert_eq!(p.name, "John"); assert_eq!(p.age, 30);