got through a good portion of loops

loops/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "loops"
+version = "0.1.0"

loops/Cargo.toml

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

loops/src/main.rs

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+fn main() {
+    println!("Hello, world!");
+    looping_through_a_list();
+}
+
+// rust has 3 types of loops: loop, while and for
+
+// This will not stop until interrupted unless told by a return, break or a ctrl-c
+fn forever_loop () {
+    loop {
+        println!("another loop!")
+    }
+
+    let mut counter = 0;
+    let value_from_loop = loop {
+        counter += 1;
+        if counter == 4 {
+            break counter;
+        }
+    };
+}
+
+// continue
+// this will start the loop over again from the top regardless of the code after it
+// break, can return values from a loop, needs a ; after break to do that
+    
+// one use of a loop is checking weather a thread is finished or do a operation that you know might fail
+
+fn loop_with_labels () {
+    let mut counter = 0;
+    let result = 'first_loop: loop {
+        println!("counter = {counter}");
+        let mut remaining = 10;
+        'inner_loop: loop {
+            println!("remaining = {remaining}");
+            if remaining == 9 {
+                // both acceptable
+                break 'inner_loop;
+                // continue 'inner_loop;
+            }
+            if counter == 2 {
+                // returns a value and goes out of the outermost loop called/labelled first_loop
+                break 'first_loop counter*2;
+            }
+            remaining -= 1;
+        }
+        counter += 1;
+    };
+    println!("counter = {counter}");
+    println!("result = {result}");
+}
+
+fn looping_with_while () {
+    let mut count_down = 3;
+    println!("liftoff in {count_down} seconds");
+
+    while count_down != 0 {
+        println!("{}!", count_down);
+
+        count_down -= 1;
+    }
+
+    println!("Lift-Off!");
+
+}
+
+// while will only run when the condition/bool is true otherwise it will call a break of the loop by itself
+// removes a lot of the nesting of if, else, and break statements in loops
+
+fn looping_through_a_list () {
+    let a = [32, 5, 20, 40, 50, 60];
+    let mut index = 0;
+    // if a.len was a static number this would/could cause the program to panic 
+    // because if a was modified and the static number was not then it would attempt to go out out the assigned memory
+    // using list.len() is always a better solution
+    while index < a.len() {
+        println!("the value is: {}", a[index]);
+        index += 1;
+    }
+}