3 files changed, 103 insertions, 0 deletions
diff --git a/rust-book/adder/Cargo.lock b/rust-book/adder/Cargo.lock
new file mode 100755
index 0000000..4fb18f9
--- /dev/null
+++ b/rust-book/adder/Cargo.lock
@@ -0,0 +1,4 @@
+[[package]]
+name = "adder"
+version = "0.1.0"
+
diff --git a/rust-book/adder/Cargo.toml b/rust-book/adder/Cargo.toml
new file mode 100755
index 0000000..5224ea1
--- /dev/null
+++ b/rust-book/adder/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "adder"
+version = "0.1.0"
+authors = ["carpenat"]
+edition = "2018"
+
+[dependencies]
diff --git a/rust-book/adder/src/lib.rs b/rust-book/adder/src/lib.rs
new file mode 100755
index 0000000..bc79931
--- /dev/null
+++ b/rust-book/adder/src/lib.rs
@@ -0,0 +1,92 @@
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_works() -> Result<(), String> {
+        if 2 + 2 == 4 {
+            Ok(())
+        }
+        else {
+            Err(String::from("two plus two does not equal four"))
+        }
+    }
+
+    #[test]
+    fn larger_can_hold_smaller() {
+        let larger = Rectangle { length: 8, width: 7 };
+        let smaller = Rectangle { length: 5, width: 1 };
+
+        assert!(larger.can_hold(&smaller));
+    }
+
+    #[test]
+    fn smaller_cannot_hold_larger() {
+        let larger = Rectangle { length: 8, width: 7 };
+        let smaller = Rectangle { length: 5, width: 1 };
+
+        assert!(!smaller.can_hold(&larger));
+    }
+
+    #[test]
+    fn it_adds_two() {
+        assert_eq!(4, add_two(2));
+    }
+
+    #[test]
+    fn it_wont_add_two() {
+        assert_ne!(4, add_two(3));
+    }
+
+    #[test]
+    fn greeting_contains_name() {
+        let result = greeting("adam");
+        assert!(result.contains("adam"));
+    }
+
+    #[test]
+    #[should_panic(expected = "must be between 1 and 100")]
+    fn greater_than_100() {
+        Guess::new(200);
+    }
+}
+
+#[derive(Debug)]
+pub struct Rectangle {
+    length: u32,
+    width: u32,
+}
+
+pub struct Guess {
+    value: i32,
+}
+
+impl Guess {
+    pub fn new(value: i32) -> Guess {
+        if value < 1 || value > 100 {
+            panic!("must be between 1 and 100, not {}", value);
+        }
+        //if value < 1 {
+        //    panic!("must be greater than 1, not {}", value);
+        //}
+        //else if value > 100 {
+        //    panic!("must be less than 100, not {}", value);
+        //}
+
+        Guess { value }
+    }
+}
+
+impl Rectangle {
+    pub fn can_hold(&self, other: &Rectangle) -> bool {
+        self.length > other.length && self.width > other.width
+    }
+}
+
+pub fn add_two(a: i32) -> i32 {
+    a + 2
+}
+
+pub fn greeting(name: &str) -> String {
+    format!("hello {}", name)
+}