part of ch8

ch8/strings/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "strings"
+version = "0.1.0"

ch8/strings/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "strings"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

ch8/strings/src/main.rs

@@ -0,0 +1,31 @@
+fn main() {
+    let mut s = String::new();
+
+    let data = "initial contents";
+    let s = data.to_string();
+
+    // this also works
+    let s = "initial contents".to_string();
+
+    // Updating a String
+    let mut s = String::from("foo");
+    s.push_str("bar");
+
+    let mut s1 = String::from("foo");
+    let s2 = "bar";
+    s1.push_str(s2);
+    println!("s2 is {s2}");
+
+    // push method takes a character and not a string
+    let mut s = String::from("lo");
+    s.push('l');
+
+    let s1 = String::from("tic");
+    let s2 = String::from("tac");
+    let s3 = String::from("toe");
+
+    let s_total = format!("{s1}-{s2}-{s3}");
+
+    // stopped here:
+    // https://rust-book.cs.brown.edu/ch08-02-strings.html#internal-representation
+}

ch8/vectors/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "vectors"
+version = "0.1.0"

ch8/vectors/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "vectors"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

ch8/vectors/src/main.rs

@@ -0,0 +1,47 @@
+fn main() {
+    let v: Vec<i32> = Vec::new();
+    let v = vec![1, 2, 3];
+
+    let mut v: Vec<i32> = Vec::new();
+    v.push(5);
+    v.push(6);
+    v.push(7);
+
+    // can access via traditional indexing with []
+    // or via the .get(index) function.
+    let v = vec![1, 2, 3, 4, 5];
+
+    let third: &i32 = &v[2];
+    println!("The third element is: {third}");
+
+    let third: Option<&i32> = v.get(2);
+    match third {
+        Some(third) => println!("The third element is: {third}"),
+        None => println!("There is no third element!"),
+    }
+
+    let v = vec![100, 32, 57];
+    for n_ref in &v {
+        let n_plus_one: i32 = *n_ref + 1;
+        println!("{n_plus_one}");
+    }
+
+    let mut v = vec![100, 32, 57];
+    for n_ref in &mut v {
+        *n_ref += 50;
+    }
+    println!("v post 50 addition: {v:?}");
+
+    // Using an Enum to Store Multiple Types
+    enum SpreadsheetCell {
+        Int(i32),
+        Float(f64),
+        Text(String),
+    }
+
+    let row = vec![
+        SpreadsheetCell::Int(3),
+        SpreadsheetCell::Text(String::from("blue")),
+        SpreadsheetCell::Float(10.12),
+    ];
+}