added day 5

Author: jsoverson

Cargo.lock

@@ -6,6 +6,19 @@ This repository is for code related to the guide at: https://vino.dev/blog/node-
 
 ### Day 4
 
-```
-cargo run -p day-4-hello-world
-```
+- `cargo run -p day-4-hello-world`
+- `cargo run -p day-4-strings-wtf-1` - intentionally does not compile.
+- `cargo run -p day-4-strings-wtf-2` - intentionally does not compile.
+
+### Day 5
+
+Reassigning:
+
+- JS: `node javascript/day-5/let-vs-const/reassigning.js`
+- Rust: `cargo run -p day-5-let-vs-const --bin reassigning`
+- `cargo run -p day-5-let-vs-const --bin reassigning-wrong-type` - intentionally does not compile
+
+Borrowing:
+
+- `cargo run -p day-5-borrowing --bin borrow`
+- `cargo run -p day-5-borrowing --bin mutable-borrow` - intentionally does not compile

README.md

@@ -0,0 +1,16 @@
+[package]
+name = "day-5-borrowing"
+version = "0.0.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+
+[[bin]]
+name = "borrow"
+path = "./src/borrow.rs"
+
+[[bin]]
+name = "mutable-borrow"
+path = "./src/mutable-borrow.rs"

crates/day-5/borrowing/Cargo.toml

@@ -0,0 +1 @@
+# Test README

crates/day-5/borrowing/README.md

@@ -0,0 +1,18 @@
+use std::{collections::HashMap, fs::read_to_string};
+
+fn main() {
+ let source = read_to_string("./README.md").unwrap();
+ let mut files = HashMap::new();
+ files.insert("README", source.clone());
+ files.insert("README2", source);
+
+ let files_ref = &files;
+ let files_ref2 = &files;
+
+ print_borrowed_map(files_ref);
+ print_borrowed_map(files_ref2);
+}
+
+fn print_borrowed_map(map: &HashMap<&str, String>) {
+ println!("{:?}", map)
+}

crates/day-5/borrowing/src/borrow.rs

@@ -0,0 +1,16 @@
+use std::{collections::HashMap, fs::read_to_string};
+
+fn main() {
+ let source = read_to_string("./README.md").unwrap();
+ let mut files = HashMap::new();
+ files.insert("README", source.clone());
+ files.insert("README2", source);
+
+ let files_ref = &mut files;
+ let files_ref2 = &mut files;
+
+ needs_mutable_ref(files_ref);
+ needs_mutable_ref(files_ref2);
+}
+
+fn needs_mutable_ref(map: &mut HashMap<&str, String>) {}

crates/day-5/borrowing/src/mutable-borrow.rs

@@ -0,0 +1 @@
+/target

crates/day-5/let-vs-const/.gitignore

@@ -0,0 +1,21 @@
+[package]
+name = "day-5-let-vs-const"
+version = "0.0.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+
+
+[[bin]]
+name = "reassigning"
+path = "./src/reassigning.rs"
+
+[[bin]]
+name = "reassigning-wrong-type"
+path = "./src/reassigning-wrong-type.rs"
+
+[[bin]]
+name = "reassigning-rebind"
+path = "./src/reassigning-rebind.rs"

crates/day-5/let-vs-const/Cargo.toml

@@ -0,0 +1,6 @@
+fn main() {
+ let myvar = 1;
+ println!("{}", myvar);
+ let myvar = "3";
+ println!("{}", myvar);
+}

crates/day-5/let-vs-const/src/reassigning-rebind.rs

@@ -0,0 +1,6 @@
+fn main() {
+ let mut mutable = 1;
+ println!("{}", mutable);
+ mutable = "3";
+ println!("{}", mutable);
+}