finished ch10.1

ch10/generics-intro/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "generics-intro"
+version = "0.1.0"

ch10/generics-intro/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "generics-intro"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

ch10/generics-intro/src/main.rs

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+fn largest(list: &[i32]) -> &i32 {
+    let mut largest = &list[0];
+
+    for item in list {
+        if item > largest {
+            largest = item;
+        }
+    }
+
+    largest
+}
+
+fn main() {
+    let number_list = vec![34, 50, 25, 100, 65];
+
+    let result = largest(&number_list);
+    println!("The largest number is {result}");
+
+    let number_list = vec![102, 34, 6000, 89, 54, 2, 43, 8];
+
+    let result = largest(&number_list);
+    println!("The largest number is {result}");
+}

ch10/syntax/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "syntax"
+version = "0.1.0"

ch10/syntax/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "syntax"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

ch10/syntax/src/main.rs

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+// The compiler can't assume anything about T, must give
+// the call a Haskell like constraint
+fn largest<T: std::cmp::PartialOrd>(list: &[T]) -> &T {
+    let mut largest = &list[0];
+
+    for item in list {
+        if item > largest {
+            largest = item;
+        }
+    }
+
+    largest
+}
+
+struct Point<T> {
+    x: T,
+    y: T,
+}
+
+impl<T> Point<T> {
+    fn x(&self) -> &T {
+        &self.x
+    }
+}
+
+// Can have non-generic implementations
+impl Point<f32> {
+    fn distance_from_origin(&self) -> f32 {
+        (self.x.powi(2) + self.y.powi(2)).sqrt()
+    }
+}
+
+fn main() {
+    let number_list = vec![34, 50, 25, 100, 65];
+
+    let result = largest(&number_list);
+    println!("The largest number is {result}");
+
+    let char_list = vec!['y', 'm', 'a', 'q'];
+
+    let result = largest(&char_list);
+    println!("The largest char is {result}");
+
+    let integer = Point { x: 5, y: 10 };
+    let float = Point { x: 1.0, y: 4.0 };
+
+    println!("integer.x = {}", integer.x());
+}