feat(str_types)

src/controlflow.rs

@@ -8,7 +8,6 @@ pub fn control_flow_module() {
         println!("{count}");
 
         count += 1;
-
         if count >= BREAKPOINT {
             break count;
         }

src/main.rs

@@ -5,22 +5,24 @@
 // : /// Doc comment: generate library docs for the following item
 // : //! Doc comment
 
-//mod helloworld;
+// mod helloworld;
-//mod primitives;
+// mod primitives;
-//mod customtypes;
+// mod customtypes;
 //mod variablebindings;
 // mod types;
 //mod conversion;
-mod controlflow;
+// mod controlflow;
 // mod traits;
+mod str_types;
 
 fn main() {
-    //helloworld::hello_world_module();
+    // helloworld::hello_world_module();
-    //primitives::primitives_module();
+    // primitives::primitives_module();
-    //customtypes::custom_types_module();
+    // customtypes::custom_types_module();
     //variablebindings::variable_bindings_module();
     //types::types_module();
     //conversion::conversion_module();
-    controlflow::control_flow_module();
+    // controlflow::control_flow_module();
     //traits::traits_exercise();
+    str_types::str_types_module();
 }

src/str_types.rs

@@ -0,0 +1,29 @@
+pub fn str_types_module() {
+    // Strings
+    // &str is a slice &[u8]
+    let my_string: &'static str = "A static string";
+
+    println!("Reversed: ");
+    for word in my_string.split_whitespace().rev() {
+        println!("> {}", word)
+    }
+
+    // Can copy into a vector
+    let mut chars: Vec<char> = my_string.chars().collect();
+    chars.sort();
+    chars.dedup(); // remove duplicates
+
+    // Initially empty strings are stored as a vector of bytes Vec<u8> in heap, is growable and not null terminated.
+    let mut real_string = String::new();
+    for c in chars {
+        real_string.push(c);
+        real_string.push_str(", ");
+    }
+
+    println!("Real string: {}", real_string);
+
+    let chars_to_trim: &[char] = &[' ', ','];
+    let real_string_trimmed: &str = real_string.trim_matches(chars_to_trim);
+
+    println!("Real string trimmed: {}", real_string_trimmed);
+}