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feat(modules): update exercises, add modules3 (#822)
Co-authored-by: diannasoriel <mokou@fastmail.com>
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@ -9,7 +9,7 @@
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| primitive_types | §4.3 |
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| structs | §5.1 |
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| enums | §6 |
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| modules | §7.2 |
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| modules | §7 |
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| collections | §8.1, §8.3 |
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| strings | §8.2 |
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| error_handling | §9 |
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@ -4,4 +4,4 @@ In this section we'll give you an introduction to Rust's module system.
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## Further information
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- [The Module System](https://doc.rust-lang.org/book/ch07-02-defining-modules-to-control-scope-and-privacy.html)
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- [The Module System](https://doc.rust-lang.org/book/ch07-00-managing-growing-projects-with-packages-crates-and-modules.html)
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@ -4,7 +4,13 @@
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// I AM NOT DONE
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mod sausage_factory {
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// Don't let anybody outside of this module see this!
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fn get_secret_recipe() -> String {
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String::from("Ginger")
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}
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fn make_sausage() {
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get_secret_recipe();
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println!("sausage!");
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}
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}
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@ -1,11 +1,15 @@
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// modules2.rs
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// You can bring module paths into scopes and provide new names for them with the
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// 'use' and 'as' keywords. Fix these 'use' statments to make the code compile.
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// Make me compile! Execute `rustlings hint modules2` for hints :)
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// I AM NOT DONE
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mod delicious_snacks {
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use self::fruits::PEAR as fruit;
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use self::veggies::CUCUMBER as veggie;
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// TODO: Fix these use statments
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use self::fruits::PEAR as ???
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use self::veggies::CUCUMBER as ???
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mod fruits {
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pub const PEAR: &'static str = "Pear";
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18
exercises/modules/modules3.rs
Normal file
18
exercises/modules/modules3.rs
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@ -0,0 +1,18 @@
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// modules3.rs
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// You can use the 'use' keyword to bring module paths from modules from anywhere
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// and especially from the Rust standard library into your scope.
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// Bring SystemTime and UNIX_EPOCH
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// from the std::time module. Bonus style points if you can do it with one line!
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// Make me compile! Execute `rustlings hint modules3` for hints :)
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// I AM NOT DONE
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// TODO: Complete this use statement
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use ???
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fn main() {
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match SystemTime::now().duration_since(UNIX_EPOCH) {
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Ok(n) => println!("1970-01-01 00:00:00 UTC was {} seconds ago!", n.as_secs()),
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Err(_) => panic!("SystemTime before UNIX EPOCH!"),
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}
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}
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18
info.toml
18
info.toml
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@ -362,11 +362,19 @@ name = "modules2"
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path = "exercises/modules/modules2.rs"
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mode = "compile"
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hint = """
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The delicious_snacks module is trying to present an external
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interface (the `fruit` and `veggie` constants) that is different than
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its internal structure (the `fruits` and `veggies` modules and
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associated constants). It's almost there except for one keyword missing for
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each constant."""
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The delicious_snacks module is trying to present an external interface that is
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different than its internal structure (the `fruits` and `veggies` modules and
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associated constants). Complete the `use` statemants to fit the uses in main and
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find the one keyword missing for both constants."""
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[[exercises]]
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name = "modules3"
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path = "exercises/modules/modules3.rs"
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mode = "compile"
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hint = """
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UNIX_EPOCH and SystemTime are declared in the std::time module. Add a use statement
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for these two to bring them into scope. You can use nested paths or the glob
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operator to bring these two in using only one line."""
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# COLLECTIONS
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