First quiz and its related modules
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@ -4,7 +4,7 @@
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// This exercise uses some concepts that we won't get to until later in the course, like `Box` and the
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// `From` trait. It's not important to understand them in detail right now, but you can read ahead if you like.
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// For now, think of the `Box<dyn ???>` type as an "I want anything that does ???" type, which, given
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// For now, think of the `Box<dyn ...>` type as an "I want anything that does ???" type, which, given
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// Rust's usual standards for runtime safety, should strike you as somewhat lenient!
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// In short, this particular use case for boxes is for when you want to own a value and you care only that it is a
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@ -1,8 +1,10 @@
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// functions1.rs
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// Execute `rustlings hint functions1` or use the `hint` watch subcommand for a hint.
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// I AM NOT DONE
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fn main() {
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call_me();
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}
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fn call_me() {
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println!("I'm Nidhal Messaoudi, a software developer going Rusty!!!");
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}
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@ -1,13 +1,11 @@
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// functions2.rs
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// Execute `rustlings hint functions2` or use the `hint` watch subcommand for a hint.
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// I AM NOT DONE
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fn main() {
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call_me(3);
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}
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fn call_me(num:) {
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fn call_me(num: i32) {
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for i in 0..num {
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println!("Ring! Call number {}", i + 1);
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}
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@ -1,10 +1,8 @@
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// functions3.rs
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// Execute `rustlings hint functions3` or use the `hint` watch subcommand for a hint.
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// I AM NOT DONE
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fn main() {
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call_me();
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call_me(12);
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}
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fn call_me(num: u32) {
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@ -7,14 +7,12 @@
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// in the signatures for now. If anything, this is a good way to peek ahead
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// to future exercises!)
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// I AM NOT DONE
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fn main() {
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let original_price = 51;
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println!("Your sale price is {}", sale_price(original_price));
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}
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fn sale_price(price: i32) -> {
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fn sale_price(price: i32) -> i32 {
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if is_even(price) {
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price - 10
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} else {
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@ -1,13 +1,11 @@
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// functions5.rs
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// Execute `rustlings hint functions5` or use the `hint` watch subcommand for a hint.
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// I AM NOT DONE
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fn main() {
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let answer = square(3);
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println!("The square of 3 is {}", answer);
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}
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fn square(num: i32) -> i32 {
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num * num;
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return num * num;
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}
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@ -1,13 +1,16 @@
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// if1.rs
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// Execute `rustlings hint if1` or use the `hint` watch subcommand for a hint.
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// I AM NOT DONE
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pub fn bigger(a: i32, b: i32) -> i32 {
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// Complete this function to return the bigger number!
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// Do not use:
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// - another function call
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// - additional variables
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if a > b {
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a
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} else {
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b
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}
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}
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// Don't mind this for now :)
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@ -4,13 +4,13 @@
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// Step 2: Get the bar_for_fuzz and default_to_baz tests passing!
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// Execute `rustlings hint if2` or use the `hint` watch subcommand for a hint.
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// I AM NOT DONE
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pub fn foo_if_fizz(fizzish: &str) -> &str {
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if fizzish == "fizz" {
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if fizzish == "fuzz" {
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"bar"
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} else if fizzish == "fizz" {
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"foo"
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} else {
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1
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"baz"
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}
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}
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@ -9,8 +9,6 @@
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// when you change one of the lines below! Try adding a `println!` line, or try changing
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// what it outputs in your terminal. Try removing a semicolon and see what happens!
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// I AM NOT DONE
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fn main() {
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println!("Hello and");
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println!(r#" welcome to... "#);
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@ -2,8 +2,6 @@
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// Make the code print a greeting to the world.
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// Execute `rustlings hint intro2` or use the `hint` watch subcommand for a hint.
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// I AM NOT DONE
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fn main() {
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println!("Hello {}!");
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println!("Hello {}!", "World");
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}
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@ -10,7 +10,7 @@
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// I AM NOT DONE
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fn main() {
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fn main () {
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let my_fav_fruits = vec!["banana", "custard apple", "avocado", "peach", "raspberry"];
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let mut my_iterable_fav_fruits = ???; // TODO: Step 1
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@ -3,7 +3,6 @@
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// I AM NOT DONE
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#[rustfmt::skip]
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macro_rules! my_macro {
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() => {
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println!("Check out my macro!");
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@ -10,10 +10,20 @@
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// Write a function that calculates the price of an order of apples given
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// the quantity bought. No hints this time!
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// I AM NOT DONE
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// Put your function here!
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// fn calculate_price_of_apples {
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fn calculate_price_of_apples(quantity: i32) -> i32 {
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let mut quantity= quantity;
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if quantity <= 40 {
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quantity = quantity * 2;
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}
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return quantity;
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// if quantity > 40 {
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// quantity
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// } else {
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// quantity * 2
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// }
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}
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// Don't modify this function!
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#[test]
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@ -32,7 +32,7 @@ fn main() {
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for offset in 0..8 {
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let child_numbers = // TODO
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joinhandles.push(thread::spawn(move || {
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let sum: u32 = child_numbers.iter().filter(|&&n| n % 8 == offset).sum();
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let sum: u32 = child_numbers.iter().filter(|n| *n % 8 == offset).sum();
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println!("Sum of offset {} is {}", offset, sum);
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}));
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}
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@ -4,9 +4,6 @@
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// Cow is a clone-on-write smart pointer.
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// It can enclose and provide immutable access to borrowed data, and clone the data lazily when mutation or ownership is required.
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// The type is designed to work with general borrowed data via the Borrow trait.
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//
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// This exercise is meant to show you what to expect when passing data to Cow.
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// Fix the unit tests by checking for Cow::Owned(_) and Cow::Borrowed(_) at the TODO markers.
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// I AM NOT DONE
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@ -23,52 +20,29 @@ fn abs_all<'a, 'b>(input: &'a mut Cow<'b, [i32]>) -> &'a mut Cow<'b, [i32]> {
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input
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn reference_mutation() -> Result<(), &'static str> {
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// Clone occurs because `input` needs to be mutated.
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let slice = [-1, 0, 1];
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let mut input = Cow::from(&slice[..]);
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match abs_all(&mut input) {
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Cow::Owned(_) => Ok(()),
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_ => Err("Expected owned value"),
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}
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fn main() {
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// No clone occurs because `input` doesn't need to be mutated.
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let slice = [0, 1, 2];
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let mut input = Cow::from(&slice[..]);
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match abs_all(&mut input) {
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Cow::Borrowed(_) => println!("I borrowed the slice!"),
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_ => panic!("expected borrowed value"),
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}
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#[test]
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fn reference_no_mutation() -> Result<(), &'static str> {
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// No clone occurs because `input` doesn't need to be mutated.
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let slice = [0, 1, 2];
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let mut input = Cow::from(&slice[..]);
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match abs_all(&mut input) {
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// TODO
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}
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// Clone occurs because `input` needs to be mutated.
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let slice = [-1, 0, 1];
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let mut input = Cow::from(&slice[..]);
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match abs_all(&mut input) {
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Cow::Owned(_) => println!("I modified the slice and now own it!"),
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_ => panic!("expected owned value"),
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}
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#[test]
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fn owned_no_mutation() -> Result<(), &'static str> {
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// We can also pass `slice` without `&` so Cow owns it directly.
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// In this case no mutation occurs and thus also no clone,
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// but the result is still owned because it always was.
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let slice = vec![0, 1, 2];
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let mut input = Cow::from(slice);
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match abs_all(&mut input) {
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// TODO
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}
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}
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#[test]
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fn owned_mutation() -> Result<(), &'static str> {
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// Of course this is also the case if a mutation does occur.
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// In this case the call to `to_mut()` returns a reference to
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// the same data as before.
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let slice = vec![-1, 0, 1];
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let mut input = Cow::from(slice);
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match abs_all(&mut input) {
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// TODO
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}
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// No clone occurs because `input` is already owned.
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let slice = vec![-1, 0, 1];
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let mut input = Cow::from(slice);
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match abs_all(&mut input) {
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// TODO
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Cow::Borrowed(_) => println!("I own this slice!"),
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_ => panic!("expected borrowed value"),
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}
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}
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// Make me compile!
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// Execute `rustlings hint variables1` or use the `hint` watch subcommand for a hint.
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// I AM NOT DONE
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fn main() {
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x = 5;
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let x = 5;
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println!("x has the value {}", x);
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}
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// variables2.rs
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// Execute `rustlings hint variables2` or use the `hint` watch subcommand for a hint.
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// I AM NOT DONE
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fn main() {
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let x;
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let x = 12;
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if x == 10 {
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println!("x is ten!");
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} else {
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// variables3.rs
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// Execute `rustlings hint variables3` or use the `hint` watch subcommand for a hint.
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// I AM NOT DONE
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fn main() {
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let x: i32;
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let x: i32 = 12;
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println!("Number {}", x);
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}
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// variables4.rs
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// Execute `rustlings hint variables4` or use the `hint` watch subcommand for a hint.
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// I AM NOT DONE
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fn main() {
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let x = 3;
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let mut x = 3;
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println!("Number {}", x);
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x = 5; // don't change this line
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println!("Number {}", x);
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// variables5.rs
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// Execute `rustlings hint variables5` or use the `hint` watch subcommand for a hint.
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// I AM NOT DONE
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fn main() {
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let number = "T-H-R-E-E"; // don't change this line
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println!("Spell a Number : {}", number);
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number = 3; // don't rename this variable
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let number = 3; // don't rename this variable
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println!("Number plus two is : {}", number + 2);
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}
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// variables6.rs
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// Execute `rustlings hint variables6` or use the `hint` watch subcommand for a hint.
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// I AM NOT DONE
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const NUMBER = 3;
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const NUMBER: i32 = 3;
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fn main() {
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println!("Number {}", NUMBER);
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}
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@ -13,5 +13,3 @@ the other useful data structure, hash maps, later.
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## Further information
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- [Storing Lists of Values with Vectors](https://doc.rust-lang.org/stable/book/ch08-01-vectors.html)
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- [`iter_mut`](https://doc.rust-lang.org/std/primitive.slice.html#method.iter_mut)
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- [`map`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map)
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