reorganized the directories

projects/iterator_demo/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "iterator_demo"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

projects/iterator_demo/src/lib.rs

@@ -0,0 +1,35 @@
+#[derive(PartialEq, Debug)]
+struct Shoe {
+    size: u32,
+    style: String,
+}
+
+fn shoes_in_size(shoes: Vec<Shoe>, shoe_size: u32) -> Vec<Shoe> {
+    shoes.into_iter().filter(|s| s.size == shoe_size).collect()
+}
+
+#[cfg(test)]
+mod tests;
+
+#[test]
+fn iterator_demonstration() {
+    let v1 = vec! [1, 2, 3];
+
+    let mut v1_iter = v1.iter();
+
+    assert_eq! (v1_iter.next(), Some(&1));
+    assert_eq! (v1_iter.next(), Some(&2));
+    assert_eq! (v1_iter.next(), Some(&3));
+    assert_eq! (v1_iter.next(), None);
+}
+
+#[test]
+fn iterator_sum() {
+    let v1 = vec! [1, 2, 3];
+
+    let v1_iter = v1.iter();
+
+    let total: i32 = v1_iter.sum();
+
+    assert_eq! (total, 6);
+}

projects/iterator_demo/src/main.rs

@@ -0,0 +1,7 @@
+fn main() {
+    let v1 = vec! [1, 2, 3];
+
+    let v2: Vec<_> = v1.iter().map(|x| x + 1).collect();
+
+    assert_eq! (v2, vec! [2, 3, 4]);
+}

projects/iterator_demo/src/tests.rs

@@ -0,0 +1,35 @@
+use super::*;
+
+#[test]
+fn filter_by_size() {
+    let shoes = vec! [
+        Shoe {
+            size: 10,
+            style: String::from("sneaker"),
+        },
+        Shoe {
+            size: 13,
+            style: String::from("sandal"),
+        },
+        Shoe {
+            size: 10,
+            style: String::from("boot"),
+        },
+    ];
+
+    let in_my_size = shoes_in_size(shoes, 10);
+
+    assert_eq! (
+        in_my_size,
+        vec! [
+        Shoe {
+            size: 10,
+            style: String::from("sneaker"),
+        },
+        Shoe {
+            size: 10,
+            style: String::from("boot"),
+        },
+        ]
+    );
+}