diff --git a/closure/Cargo.lock b/closure/Cargo.lock
new file mode 100644
index 0000000..cda8226
--- /dev/null
+++ b/closure/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "closure"
+version = "0.1.0"
diff --git a/closure/Cargo.toml b/closure/Cargo.toml
new file mode 100644
index 0000000..a375fdc
--- /dev/null
+++ b/closure/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "closure"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/closure/src/main.rs b/closure/src/main.rs
new file mode 100644
index 0000000..bb8c6f7
--- /dev/null
+++ b/closure/src/main.rs
@@ -0,0 +1,54 @@
+#[derive(Debug)]
+struct Value {
+    val: i64,
+}
+
+impl Value {
+    fn new(number: i64) -> Self {
+        Self { val: number }
+    }
+
+    fn is_odd(&self) -> bool {
+        self.val % 2 != 0
+    }
+
+    fn is_even(&self) -> bool {
+        self.val % 2 == 0
+    }
+}
+
+struct Holder {
+    values: Vec<Value>,
+}
+
+impl Holder {
+    fn new() -> Self {
+        Self { values: Vec::new() }
+    }
+
+    fn push(&mut self, val: i64) {
+        self.values.push(Value::new(val))
+    }
+
+    fn filter(&self, predicate: fn(&Value) -> bool) {
+        self.values
+            .iter()
+            .filter(|x| predicate(x))
+            .for_each(|x| println!("{:?}", x));
+    }
+}
+
+fn main() {
+    let mut holder = Holder::new();
+    holder.push(1);
+    holder.push(2);
+    holder.push(3);
+    holder.push(4);
+    holder.push(5);
+    holder.push(6);
+    holder.push(7);
+    holder.push(8);
+
+    holder.filter(|x| Value::is_even(x));
+    holder.filter(|x| Value::is_odd(x));
+}
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new file mode 100644
index 0000000..9a9edc4
--- /dev/null
+++ b/helloworld-tonic/Cargo.lock
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+ "tokio-macros",
+ "winapi",
+]
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+ "pin-project-lite",
+ "tokio",
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+ "bytes",
+ "futures-core",
+ "futures-sink",
+ "log",
+ "pin-project-lite",
+ "tokio",
+]
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+ "bytes",
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+ "bytes",
+ "futures-core",
+ "futures-util",
+ "h2",
+ "http",
+ "http-body",
+ "hyper",
+ "hyper-timeout",
+ "percent-encoding",
+ "pin-project",
+ "prost",
+ "prost-derive",
+ "tokio",
+ "tokio-stream",
+ "tokio-util 0.6.9",
+ "tower",
+ "tower-layer",
+ "tower-service",
+ "tracing",
+ "tracing-futures",
+]
+
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+ "quote",
+ "syn",
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+ "futures-core",
+ "futures-util",
+ "indexmap",
+ "pin-project",
+ "pin-project-lite",
+ "rand",
+ "slab",
+ "tokio",
+ "tokio-util 0.7.1",
+ "tower-layer",
+ "tower-service",
+ "tracing",
+]
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+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
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+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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diff --git a/helloworld-tonic/Cargo.toml b/helloworld-tonic/Cargo.toml
new file mode 100644
index 0000000..1635aca
--- /dev/null
+++ b/helloworld-tonic/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "helloworld-tonic"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+prost = "0.9.0"
+tokio = { version = "1.17.0", features = ["rt", "macros"] }
+tonic = "0.6"
+
+[build-dependencies]
+tonic-build = "0.6"
diff --git a/helloworld-tonic/build.rs b/helloworld-tonic/build.rs
new file mode 100644
index 0000000..7c661fe
--- /dev/null
+++ b/helloworld-tonic/build.rs
@@ -0,0 +1,4 @@
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    tonic_build::compile_protos("proto/helloworld.proto")?;
+    Ok(())
+}
diff --git a/helloworld-tonic/proto/helloworld.proto b/helloworld-tonic/proto/helloworld.proto
new file mode 100644
index 0000000..a42ae15
--- /dev/null
+++ b/helloworld-tonic/proto/helloworld.proto
@@ -0,0 +1,14 @@
+syntax = "proto3";
+package helloworld;
+
+service Greeter {
+    rpc SayHello (HelloRequest) returns (HelloReply);
+}
+
+message HelloRequest {
+   string name = 1;
+}
+
+message HelloReply {
+    string message = 1;
+}
diff --git a/helloworld-tonic/src/main.rs b/helloworld-tonic/src/main.rs
new file mode 100644
index 0000000..62c97f6
--- /dev/null
+++ b/helloworld-tonic/src/main.rs
@@ -0,0 +1,42 @@
+use hello_world::greeter_server::Greeter;
+use hello_world::greeter_server::GreeterServer;
+use hello_world::HelloReply;
+use hello_world::HelloRequest;
+use tonic::transport::Server;
+use tonic::Request;
+use tonic::Response;
+use tonic::Status;
+
+pub mod hello_world {
+    tonic::include_proto!("helloworld");
+}
+
+#[derive(Debug, Default)]
+pub struct MyGreeter {}
+
+#[tonic::async_trait]
+impl Greeter for MyGreeter {
+    async fn say_hello(
+        &self,
+        request: Request<HelloRequest>,
+    ) -> Result<Response<HelloReply>, Status> {
+        println!("Got a request; {:?}", request);
+        let reply = hello_world::HelloReply {
+            message: format!("Hello {}", request.into_inner().name).into(),
+        };
+        Ok(Response::new(reply))
+    }
+}
+
+#[tokio::main(flavor = "current_thread")]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let addr = "[::1]:50051".parse()?;
+    let greeter = MyGreeter::default();
+
+    Server::builder()
+        .add_service(GreeterServer::new(greeter))
+        .serve(addr)
+        .await?;
+
+    Ok(())
+}