Working with vectors.

Author: unpervertedkid

rustlang_book/collections/vectors/Cargo.toml

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+[package]
+name = "vectors"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

rustlang_book/collections/vectors/src/main.rs

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+fn main() {
+    let mut marks:Vec<u32> = vec![10, 20, 30, 40, 50];
+
+    // Accessing elements of a vector directly using the index. Using an index out of 
+    // bounds will cause a panic.
+    let top = &marks[4];
+    println!("The top mark is {}", top);
+
+    // Accessing elements of a vector using the get() method. Using an index out of
+    // bounds will return None.
+    let bottom = marks.get(0);
+    match bottom {
+        Some(mark) => println!("The bottom mark is {}", mark),
+        None => println!("No bottom mark found"),
+    }
+
+    println!("Adding 10 to each mark");
+    
+    // Iterating over mutable references to each element in the vector. 
+    for mark in &mut marks {
+        *mark += 10;
+    }
+
+    // Iterating over immutable references to each element in the vector.
+    for mark in &marks {
+        println!("Mark: {}", mark);
+    }
+}