From bd91374d46faa0ccf4ed5cce4c5556322e7c9f1f Mon Sep 17 00:00:00 2001
From: Reality Enjoyer <git@88842069.com>
Date: Tue, 13 Jan 2026 08:32:20 +0000
Subject: [PATCH] strings

---
 hash_maps/Cargo.toml  |  6 +++++
 hash_maps/src/main.rs | 31 ++++++++++++++++++++++++++
 strings/Cargo.toml    |  6 +++++
 strings/src/main.rs   | 52 +++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 95 insertions(+)
 create mode 100644 hash_maps/Cargo.toml
 create mode 100644 hash_maps/src/main.rs
 create mode 100644 strings/Cargo.toml
 create mode 100644 strings/src/main.rs

diff --git a/hash_maps/Cargo.toml b/hash_maps/Cargo.toml
new file mode 100644
index 0000000..bad93be
--- /dev/null
+++ b/hash_maps/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "hash_maps"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
diff --git a/hash_maps/src/main.rs b/hash_maps/src/main.rs
new file mode 100644
index 0000000..d0070a5
--- /dev/null
+++ b/hash_maps/src/main.rs
@@ -0,0 +1,31 @@
+use std::collections::HashMap;
+
+fn main() {
+    use std::collections::HashMap;
+
+    let mut capitals = HashMap::new();
+
+    capitals.insert(String::from("Tokyo"), 43_000_000);
+    capitals.insert(String::from("Beijing"), 62_000_000);
+    capitals.insert(String::from("South Korea"), 29_000_000);
+
+    for (key, value) in &capitals {
+        println!("{key}: {value}")
+    }
+
+    let test1 = String::from("Tokyo");
+    let test2 = String::from("London");
+
+    let passing_test = get_population(capitals.clone(), test1);
+    let failing_test = get_population(capitals, test2);
+
+    println!(
+        "\npassing test: {:?}\nfailing test: {:?}",
+        passing_test, failing_test
+    );
+}
+
+fn get_population(capitals: HashMap<String, u32>, key: String) -> u32 {
+    let population = capitals.get(&key).copied().unwrap_or(0);
+    population
+}
diff --git a/strings/Cargo.toml b/strings/Cargo.toml
new file mode 100644
index 0000000..5e6e691
--- /dev/null
+++ b/strings/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "strings"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
diff --git a/strings/src/main.rs b/strings/src/main.rs
new file mode 100644
index 0000000..38d058d
--- /dev/null
+++ b/strings/src/main.rs
@@ -0,0 +1,52 @@
+fn main() {
+    // strings: collections of bytes with some useful methods
+
+    // akshually, Rust only has ONE string type in the core language
+    // the string slice 'str'
+    // string literals = stored in the binary
+    // string slices = reference to string data stored elsewhere
+    // it's all UTF-8 encoded under the hood
+
+    let s = "hello darkness".to_string();
+
+    let mut half = "my old ".to_string();
+
+    //using push_str() to append to a string
+    half.push_str("friend!");
+
+    // you can add strings using +...
+
+    let space = " ".to_string();
+
+    // let final_string = s + " " + &half;
+    // let final_string = s + &space + &half;
+    // println!("{}", final_string);
+
+    // ...or using format!()
+
+    let final_formatted_string = format!("{s}{space}{half}");
+    println!("{}", final_formatted_string);
+}
+
+// let hello = String::from("السلام عليكم");
+// println!("{}", hello);
+// let hello = String::from("Dobrý den");
+// println!("{}", hello);
+// let hello = String::from("Hello");
+// println!("{}", hello);
+// let hello = String::from("שלום");
+// println!("{}", hello);
+// let hello = String::from("नमस्ते");
+// println!("{}", hello);
+// let hello = String::from("こんにちは");
+// println!("{}", hello);
+// let hello = String::from("안녕하세요");
+// println!("{}", hello);
+// let hello = String::from("你好");
+// println!("{}", hello);
+// let hello = String::from("Olá");
+// println!("{}", hello);
+// let hello = String::from("Здравствуйте");
+// println!("{}", hello);
+// let hello = String::from("Hola");
+// println!("{}", hello);