Merge branch 'main' into all

.all-contributorsrc

@@ -1002,6 +1002,78 @@
       "contributions": [
         "content"
       ]
+    },
+    {
+      "login": "EmisonLu",
+      "name": "Zhenghao Lu",
+      "avatar_url": "https://avatars.githubusercontent.com/u/54395432?v=4",
+      "profile": "https://github.com/EmisonLu",
+      "contributions": [
+        "content"
+      ]
+    },
+    {
+      "login": "fredr",
+      "name": "Fredrik Enestad",
+      "avatar_url": "https://avatars.githubusercontent.com/u/762956?v=4",
+      "profile": "https://soundtrackyourbrand.com",
+      "contributions": [
+        "content"
+      ]
+    },
+    {
+      "login": "xuesongbj",
+      "name": "xuesong",
+      "avatar_url": "https://avatars.githubusercontent.com/u/18476085?v=4",
+      "profile": "http://xuesong.pydevops.com",
+      "contributions": [
+        "content"
+      ]
+    },
+    {
+      "login": "MpdWalsh",
+      "name": "Michael Walsh",
+      "avatar_url": "https://avatars.githubusercontent.com/u/48160144?v=4",
+      "profile": "https://github.com/MpdWalsh",
+      "contributions": [
+        "code"
+      ]
+    },
+    {
+      "login": "alirezaghey",
+      "name": "alirezaghey",
+      "avatar_url": "https://avatars.githubusercontent.com/u/26653424?v=4",
+      "profile": "https://github.com/alirezaghey",
+      "contributions": [
+        "content"
+      ]
+    },
+    {
+      "login": "frvannes16",
+      "name": "Franklin van Nes",
+      "avatar_url": "https://avatars.githubusercontent.com/u/3188475?v=4",
+      "profile": "https://github.com/frvannes16",
+      "contributions": [
+        "code"
+      ]
+    },
+    {
+      "login": "nekonako",
+      "name": "nekonako",
+      "avatar_url": "https://avatars.githubusercontent.com/u/46141275?v=4",
+      "profile": "https://nekonako.github.io",
+      "contributions": [
+        "code"
+      ]
+    },
+    {
+      "login": "tan-zx",
+      "name": "ZX",
+      "avatar_url": "https://avatars.githubusercontent.com/u/67887489?v=4",
+      "profile": "https://github.com/tan-zx",
+      "contributions": [
+        "content"
+      ]
     }
   ],
   "contributorsPerLine": 8,

Cargo.toml

@@ -2,7 +2,7 @@
 name = "rustlings"
 version = "4.6.0"
 authors = ["anastasie <ana@ana.st>", "Carol (Nichols || Goulding) <carol.nichols@gmail.com>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 argh = "0.1.4"

README.md

@@ -1,5 +1,5 @@
 <!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
-[![All Contributors](https://img.shields.io/badge/all_contributors-108-orange.svg?style=flat-square)](#contributors-)
+[![All Contributors](https://img.shields.io/badge/all_contributors-116-orange.svg?style=flat-square)](#contributors-)
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 
 # rustlings 🦀❤️
@@ -312,6 +312,16 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
     <td align="center"><a href="https://github.com/Millione"><img src="https://avatars.githubusercontent.com/u/38575932?v=4?s=100" width="100px;" alt=""/><br /><sub><b>LIU JIE</b></sub></a><br /><a href="#content-Millione" title="Content">🖋</a></td>
     <td align="center"><a href="https://github.com/abusch"><img src="https://avatars.githubusercontent.com/u/506344?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Antoine Büsch</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=abusch" title="Code">💻</a></td>
     <td align="center"><a href="https://frogtd.com/"><img src="https://avatars.githubusercontent.com/u/31412003?v=4?s=100" width="100px;" alt=""/><br /><sub><b>frogtd</b></sub></a><br /><a href="#content-frogtd" title="Content">🖋</a></td>
+    <td align="center"><a href="https://github.com/EmisonLu"><img src="https://avatars.githubusercontent.com/u/54395432?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Zhenghao Lu</b></sub></a><br /><a href="#content-EmisonLu" title="Content">🖋</a></td>
+    <td align="center"><a href="https://soundtrackyourbrand.com"><img src="https://avatars.githubusercontent.com/u/762956?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Fredrik Enestad</b></sub></a><br /><a href="#content-fredr" title="Content">🖋</a></td>
+    <td align="center"><a href="http://xuesong.pydevops.com"><img src="https://avatars.githubusercontent.com/u/18476085?v=4?s=100" width="100px;" alt=""/><br /><sub><b>xuesong</b></sub></a><br /><a href="#content-xuesongbj" title="Content">🖋</a></td>
+    <td align="center"><a href="https://github.com/MpdWalsh"><img src="https://avatars.githubusercontent.com/u/48160144?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Michael Walsh</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=MpdWalsh" title="Code">💻</a></td>
+  </tr>
+  <tr>
+    <td align="center"><a href="https://github.com/alirezaghey"><img src="https://avatars.githubusercontent.com/u/26653424?v=4?s=100" width="100px;" alt=""/><br /><sub><b>alirezaghey</b></sub></a><br /><a href="#content-alirezaghey" title="Content">🖋</a></td>
+    <td align="center"><a href="https://github.com/frvannes16"><img src="https://avatars.githubusercontent.com/u/3188475?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Franklin van Nes</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=frvannes16" title="Code">💻</a></td>
+    <td align="center"><a href="https://nekonako.github.io"><img src="https://avatars.githubusercontent.com/u/46141275?v=4?s=100" width="100px;" alt=""/><br /><sub><b>nekonako</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=nekonako" title="Code">💻</a></td>
+    <td align="center"><a href="https://github.com/tan-zx"><img src="https://avatars.githubusercontent.com/u/67887489?v=4?s=100" width="100px;" alt=""/><br /><sub><b>ZX</b></sub></a><br /><a href="#content-tan-zx" title="Content">🖋</a></td>
   </tr>
 </table>
 

exercises/clippy/clippy1.rs

@@ -8,10 +8,16 @@
 
 // I AM NOT DONE
 
+use std::f32;
+
 fn main() {
-    let x = 1.2331f64;
-    let y = 1.2332f64;
-    if y != x {
-        println!("Success!");
-    }
+    let pi = 3.14f32;
+    let radius = 5.00f32;
+
+    let area = pi * f32::powi(radius, 2);
+
+    println!(
+        "The area of a circle with radius {:.2} is {:.5}!",
+        radius, area
+    )
 }

exercises/move_semantics/move_semantics5.rs

@@ -1,5 +1,5 @@
 // move_semantics5.rs
-// Make me compile only be reordering the lines in `main()`, but without
+// Make me compile only by reordering the lines in `main()`, but without
 // adding, changing or removing any of them.
 // Execute `rustlings hint move_semantics5` for hints :)
 

exercises/quiz1.rs

@@ -2,6 +2,7 @@
 // This is a quiz for the following sections:
 // - Variables
 // - Functions
+// - If
 
 // Mary is buying apples. One apple usually costs 2 Rustbucks, but if you buy
 // more than 40 at once, each apple only costs 1! Write a function that calculates

exercises/structs/structs3.rs

@@ -19,11 +19,11 @@ impl Package {
             // Something goes here...
             panic!("Weight of package is less than 0.");
         } else {
-            return Package {
+            Package {
                 sender_country,
                 recipient_country,
                 weight_in_grams,
-            };
+            }
         }
     }
 

exercises/traits/traits1.rs

@@ -34,12 +34,12 @@ mod tests {
     use super::*;
 
     #[test]
-    fn is_FooBar() {
+    fn is_foo_bar() {
         assert_eq!(String::from("Foo").append_bar(), String::from("FooBar"));
     }
 
     #[test]
-    fn is_BarBar() {
+    fn is_bar_bar() {
         assert_eq!(
             String::from("").append_bar().append_bar(),
             String::from("BarBar")

info.toml

@@ -114,8 +114,7 @@ path = "exercises/functions/functions5.rs"
 mode = "compile"
 hint = """
 This is a really common error that can be fixed by removing one character.
-It happens because Rust distinguishes between expressions and statements: expressions return
-a value based on its operand, and statements simply return a () type which behaves just like `void` in C/C++ language.
+It happens because Rust distinguishes between expressions and statements: expressions return a value based on their operand(s), and statements simply return a () type which behaves just like `void` in C/C++ language.
 We want to return a value of `i32` type from the `square` function, but it is returning a `()` type...
 They are not the same. There are two solutions:
 1. Add a `return` ahead of `num * num;`
@@ -364,7 +363,7 @@ mode = "compile"
 hint = """
 The delicious_snacks module is trying to present an external interface that is 
 different than its internal structure (the `fruits` and `veggies` modules and
-associated constants). Complete the `use` statemants to fit the uses in main and
+associated constants). Complete the `use` statements to fit the uses in main and
 find the one keyword missing for both constants."""
 
 [[exercises]]
@@ -907,15 +906,15 @@ name = "clippy1"
 path = "exercises/clippy/clippy1.rs"
 mode = "clippy"
 hint = """
-Not every floating point value can be represented exactly in binary values in
-memory. Take a look at the description of 
-https://doc.rust-lang.org/stable/std/primitive.f32.html
-When using the binary compare operators with floating points you won't compare
-the floating point values but the binary representation in memory. This is 
-usually not what you would like to do. 
+Rust stores the highest precision version of any long or inifinite precision
+mathematical constants in the rust standard library.
+https://doc.rust-lang.org/stable/std/f32/consts/index.html
+
+We may be tempted to use our own approximations for certain mathematical constants,
+but clippy recognizes those imprecise mathematical constants as a source of 
+potential error.
 See the suggestions of the clippy warning in compile output and use the
-machine epsilon value...
-https://doc.rust-lang.org/stable/std/primitive.f32.html#associatedconstant.EPSILON"""
+appropriate replacement constant from std::f32::consts..."""
 
 [[exercises]]
 name = "clippy2"

src/exercise.rs

@@ -217,8 +217,7 @@ path = "{}.rs""#,
         let matched_line_index = source
             .lines()
             .enumerate()
-            .filter_map(|(i, line)| if re.is_match(line) { Some(i) } else { None })
-            .next()
+            .find_map(|(i, line)| if re.is_match(line) { Some(i) } else { None })
             .expect("This should not happen at all");
 
         let min_line = ((matched_line_index as i32) - (CONTEXT as i32)).max(0) as usize;