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authorAdam Carpenter <53hornet@gmail.com>2019-03-27 15:32:37 -0400
committerAdam Carpenter <53hornet@gmail.com>2019-03-27 15:32:37 -0400
commit67cdcc2e12118becb823e20a40cc2687f2b8425a (patch)
treeed92c3234b89079e6d4cf36f5e80c5ffa79def48 /rust-book/adder/src
parente25482fca375d318a39c3b54db396b0db6e0b263 (diff)
downloadlearning-rust-67cdcc2e12118becb823e20a40cc2687f2b8425a.tar.xz
learning-rust-67cdcc2e12118becb823e20a40cc2687f2b8425a.zip
Started Rust in Action MEAP.
Diffstat (limited to 'rust-book/adder/src')
-rwxr-xr-xrust-book/adder/src/lib.rs92
1 files changed, 92 insertions, 0 deletions
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)
+}