From c6c48de95fe992f5a9fc633e2ab8a757506b749a Mon Sep 17 00:00:00 2001
From: Vladan Popovic <vladanovic@gmail.com>
Date: Sun, 11 Aug 2019 13:50:31 +0200
Subject: [PATCH] Chapter 1 excercises

---
 chapter-1/.gitignore  |  2 ++
 chapter-1/Cargo.lock  |  6 ++++++
 chapter-1/Cargo.toml  |  9 +++++++++
 chapter-1/src/main.rs | 19 +++++++++++++++++++
 4 files changed, 36 insertions(+)
 create mode 100644 chapter-1/.gitignore
 create mode 100644 chapter-1/Cargo.lock
 create mode 100644 chapter-1/Cargo.toml
 create mode 100644 chapter-1/src/main.rs

diff --git a/chapter-1/.gitignore b/chapter-1/.gitignore
new file mode 100644
index 0000000..53eaa21
--- /dev/null
+++ b/chapter-1/.gitignore
@@ -0,0 +1,2 @@
+/target
+**/*.rs.bk
diff --git a/chapter-1/Cargo.lock b/chapter-1/Cargo.lock
new file mode 100644
index 0000000..c45cb25
--- /dev/null
+++ b/chapter-1/Cargo.lock
@@ -0,0 +1,6 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "chapter-1"
+version = "0.1.0"
+
diff --git a/chapter-1/Cargo.toml b/chapter-1/Cargo.toml
new file mode 100644
index 0000000..af4ad80
--- /dev/null
+++ b/chapter-1/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "chapter-1"
+version = "0.1.0"
+authors = ["Vladan Popovic <vladanovic@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/chapter-1/src/main.rs b/chapter-1/src/main.rs
new file mode 100644
index 0000000..91855a9
--- /dev/null
+++ b/chapter-1/src/main.rs
@@ -0,0 +1,19 @@
+fn id<T>(x: T) -> T {
+    x
+}
+
+fn compose<A, B, C, F, G>(f: F, g: G) -> impl Fn(A) -> C
+where
+    F: Fn(A) -> B,
+    G: Fn(B) -> C,
+{
+    move |x: A| g(f(x))
+}
+
+fn inc(x: u32) -> u32 {
+    x + 1
+}
+
+fn main() {
+    assert!(compose(id, inc)(2) == compose(inc, id)(2));
+}