rustlings: move to rust/

6 files changed, 0 insertions, 329 deletions

diff --git a/rustlings/solutions/13_error_handling/errors1.rs b/rustlings/solutions/13_error_handling/errors1.rs
deleted file mode 100644
index f552ca7..0000000
--- a/rustlings/solutions/13_error_handling/errors1.rs
+++ /dev/null
@@ -1,37 +0,0 @@
-fn generate_nametag_text(name: String) -> Result<String, String> {
-    //                                    ^^^^^^         ^^^^^^
-    if name.is_empty() {
-        // `Err(String)` instead of `None`.
-        Err("Empty names aren't allowed".to_string())
-    } else {
-        // `Ok` instead of `Some`.
-        Ok(format!("Hi! My name is {name}"))
-    }
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn generates_nametag_text_for_a_nonempty_name() {
-        assert_eq!(
-            generate_nametag_text("Beyoncé".to_string()).as_deref(),
-            Ok("Hi! My name is Beyoncé"),
-        );
-    }
-
-    #[test]
-    fn explains_why_generating_nametag_text_fails() {
-        assert_eq!(
-            generate_nametag_text(String::new())
-                .as_ref()
-                .map_err(|e| e.as_str()),
-            Err("Empty names aren't allowed"),
-        );
-    }
-}
diff --git a/rustlings/solutions/13_error_handling/errors2.rs b/rustlings/solutions/13_error_handling/errors2.rs
deleted file mode 100644
index f0e144e..0000000
--- a/rustlings/solutions/13_error_handling/errors2.rs
+++ /dev/null
@@ -1,58 +0,0 @@
-// Say we're writing a game where you can buy items with tokens. All items cost
-// 5 tokens, and whenever you purchase items there is a processing fee of 1
-// token. A player of the game will type in how many items they want to buy, and
-// the `total_cost` function will calculate the total cost of the items. Since
-// the player typed in the quantity, we get it as a string. They might have
-// typed anything, not just numbers!
-//
-// Right now, this function isn't handling the error case at all. What we want
-// to do is: If we call the `total_cost` function on a string that is not a
-// number, that function will return a `ParseIntError`. In that case, we want to
-// immediately return that error from our function and not try to multiply and
-// add.
-//
-// There are at least two ways to implement this that are both correct. But one
-// is a lot shorter!
-
-use std::num::ParseIntError;
-
-#[allow(unused_variables, clippy::question_mark)]
-fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {
-    let processing_fee = 1;
-    let cost_per_item = 5;
-
-    // Added `?` to propagate the error.
-    let qty = item_quantity.parse::<i32>()?;
-    //                                    ^ added
-
-    // Equivalent to this verbose version:
-    let qty = match item_quantity.parse::<i32>() {
-        Ok(v) => v,
-        Err(e) => return Err(e),
-    };
-
-    Ok(qty * cost_per_item + processing_fee)
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use std::num::IntErrorKind;
-
-    #[test]
-    fn item_quantity_is_a_valid_number() {
-        assert_eq!(total_cost("34"), Ok(171));
-    }
-
-    #[test]
-    fn item_quantity_is_an_invalid_number() {
-        assert_eq!(
-            total_cost("beep boop").unwrap_err().kind(),
-            &IntErrorKind::InvalidDigit,
-        );
-    }
-}
diff --git a/rustlings/solutions/13_error_handling/errors3.rs b/rustlings/solutions/13_error_handling/errors3.rs
deleted file mode 100644
index 63f4aba..0000000
--- a/rustlings/solutions/13_error_handling/errors3.rs
+++ /dev/null
@@ -1,32 +0,0 @@
-// This is a program that is trying to use a completed version of the
-// `total_cost` function from the previous exercise. It's not working though!
-// Why not? What should we do to fix it?
-
-use std::num::ParseIntError;
-
-// Don't change this function.
-fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {
-    let processing_fee = 1;
-    let cost_per_item = 5;
-    let qty = item_quantity.parse::<i32>()?;
-
-    Ok(qty * cost_per_item + processing_fee)
-}
-
-fn main() -> Result<(), ParseIntError> {
-    //    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ added
-    let mut tokens = 100;
-    let pretend_user_input = "8";
-
-    let cost = total_cost(pretend_user_input)?;
-
-    if cost > tokens {
-        println!("You can't afford that many!");
-    } else {
-        tokens -= cost;
-        println!("You now have {tokens} tokens.");
-    }
-
-    // Added this line to return the `Ok` variant of the expected `Result`.
-    Ok(())
-}
diff --git a/rustlings/solutions/13_error_handling/errors4.rs b/rustlings/solutions/13_error_handling/errors4.rs
deleted file mode 100644
index 70c5f1c..0000000
--- a/rustlings/solutions/13_error_handling/errors4.rs
+++ /dev/null
@@ -1,42 +0,0 @@
-use std::cmp::Ordering;
-
-#[derive(PartialEq, Debug)]
-enum CreationError {
-    Negative,
-    Zero,
-}
-
-#[derive(PartialEq, Debug)]
-struct PositiveNonzeroInteger(u64);
-
-impl PositiveNonzeroInteger {
-    fn new(value: i64) -> Result<Self, CreationError> {
-        match value.cmp(&0) {
-            Ordering::Less => Err(CreationError::Negative),
-            Ordering::Equal => Err(CreationError::Zero),
-            Ordering::Greater => Ok(Self(value as u64)),
-        }
-    }
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_creation() {
-        assert_eq!(
-            PositiveNonzeroInteger::new(10),
-            Ok(PositiveNonzeroInteger(10)),
-        );
-        assert_eq!(
-            PositiveNonzeroInteger::new(-10),
-            Err(CreationError::Negative),
-        );
-        assert_eq!(PositiveNonzeroInteger::new(0), Err(CreationError::Zero));
-    }
-}
diff --git a/rustlings/solutions/13_error_handling/errors5.rs b/rustlings/solutions/13_error_handling/errors5.rs
deleted file mode 100644
index c1424ee..0000000
--- a/rustlings/solutions/13_error_handling/errors5.rs
+++ /dev/null
@@ -1,54 +0,0 @@
-// This exercise is an altered version of the `errors4` exercise. It uses some
-// concepts that we won't get to until later in the course, like `Box` and the
-// `From` trait. It's not important to understand them in detail right now, but
-// you can read ahead if you like. For now, think of the `Box<dyn ???>` type as
-// an "I want anything that does ???" type.
-//
-// In short, this particular use case for boxes is for when you want to own a
-// value and you care only that it is a type which implements a particular
-// trait. To do so, The `Box` is declared as of type `Box<dyn Trait>` where
-// `Trait` is the trait the compiler looks for on any value used in that
-// context. For this exercise, that context is the potential errors which
-// can be returned in a `Result`.
-
-use std::error::Error;
-use std::fmt;
-
-#[derive(PartialEq, Debug)]
-enum CreationError {
-    Negative,
-    Zero,
-}
-
-// This is required so that `CreationError` can implement `Error`.
-impl fmt::Display for CreationError {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        let description = match *self {
-            CreationError::Negative => "number is negative",
-            CreationError::Zero => "number is zero",
-        };
-        f.write_str(description)
-    }
-}
-
-impl Error for CreationError {}
-
-#[derive(PartialEq, Debug)]
-struct PositiveNonzeroInteger(u64);
-
-impl PositiveNonzeroInteger {
-    fn new(value: i64) -> Result<PositiveNonzeroInteger, CreationError> {
-        match value {
-            x if x < 0 => Err(CreationError::Negative),
-            0 => Err(CreationError::Zero),
-            x => Ok(PositiveNonzeroInteger(x as u64)),
-        }
-    }
-}
-
-fn main() -> Result<(), Box<dyn Error>> {
-    let pretend_user_input = "42";
-    let x: i64 = pretend_user_input.parse()?;
-    println!("output={:?}", PositiveNonzeroInteger::new(x)?);
-    Ok(())
-}
diff --git a/rustlings/solutions/13_error_handling/errors6.rs b/rustlings/solutions/13_error_handling/errors6.rs
deleted file mode 100644
index ce18073..0000000
--- a/rustlings/solutions/13_error_handling/errors6.rs
+++ /dev/null
@@ -1,106 +0,0 @@
-// Using catch-all error types like `Box<dyn Error>` isn't recommended for
-// library code where callers might want to make decisions based on the error
-// content instead of printing it out or propagating it further. Here, we define
-// a custom error type to make it possible for callers to decide what to do next
-// when our function returns an error.
-
-use std::num::ParseIntError;
-
-#[derive(PartialEq, Debug)]
-enum CreationError {
-    Negative,
-    Zero,
-}
-
-// A custom error type that we will be using in `PositiveNonzeroInteger::parse`.
-#[derive(PartialEq, Debug)]
-enum ParsePosNonzeroError {
-    Creation(CreationError),
-    ParseInt(ParseIntError),
-}
-
-impl ParsePosNonzeroError {
-    fn from_creation(err: CreationError) -> Self {
-        Self::Creation(err)
-    }
-
-    fn from_parse_int(err: ParseIntError) -> Self {
-        Self::ParseInt(err)
-    }
-}
-
-// As an alternative solution, implementing the `From` trait allows for the
-// automatic conversion from a `ParseIntError` into a `ParsePosNonzeroError`
-// using the `?` operator, without the need to call `map_err`.
-//
-// ```
-// let x: i64 = s.parse()?;
-// ```
-//
-// Traits like `From` will be dealt with in later exercises.
-impl From<ParseIntError> for ParsePosNonzeroError {
-    fn from(err: ParseIntError) -> Self {
-        ParsePosNonzeroError::ParseInt(err)
-    }
-}
-
-#[derive(PartialEq, Debug)]
-struct PositiveNonzeroInteger(u64);
-
-impl PositiveNonzeroInteger {
-    fn new(value: i64) -> Result<Self, CreationError> {
-        match value {
-            x if x < 0 => Err(CreationError::Negative),
-            0 => Err(CreationError::Zero),
-            x => Ok(Self(x as u64)),
-        }
-    }
-
-    fn parse(s: &str) -> Result<Self, ParsePosNonzeroError> {
-        // Return an appropriate error instead of panicking when `parse()`
-        // returns an error.
-        let x: i64 = s.parse().map_err(ParsePosNonzeroError::from_parse_int)?;
-        //                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-        Self::new(x).map_err(ParsePosNonzeroError::from_creation)
-    }
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod test {
-    use super::*;
-
-    #[test]
-    fn test_parse_error() {
-        assert!(matches!(
-            PositiveNonzeroInteger::parse("not a number"),
-            Err(ParsePosNonzeroError::ParseInt(_)),
-        ));
-    }
-
-    #[test]
-    fn test_negative() {
-        assert_eq!(
-            PositiveNonzeroInteger::parse("-555"),
-            Err(ParsePosNonzeroError::Creation(CreationError::Negative)),
-        );
-    }
-
-    #[test]
-    fn test_zero() {
-        assert_eq!(
-            PositiveNonzeroInteger::parse("0"),
-            Err(ParsePosNonzeroError::Creation(CreationError::Zero)),
-        );
-    }
-
-    #[test]
-    fn test_positive() {
-        let x = PositiveNonzeroInteger::new(42).unwrap();
-        assert_eq!(x.0, 42);
-        assert_eq!(PositiveNonzeroInteger::parse("42"), Ok(x));
-    }
-}