feat: Add Option2 exercise (#290)

* added option2

* changed up the exercise, modified the help section

* Update exercises/option/option2.rs

Co-Authored-By: fmoko <mokou@posteo.net>

* Update exercises/option/option2.rs

Co-Authored-By: fmoko <mokou@posteo.net>

* Update exercises/option/option2.rs

Co-Authored-By: fmoko <mokou@posteo.net>

Co-authored-by: fmoko <mokou@posteo.net>
This commit is contained in:
Sanjay K 2020-04-07 14:16:10 -04:00 committed by GitHub
parent 71d31256a6
commit 86b5c08b9b
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2 changed files with 40 additions and 0 deletions

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@ -0,0 +1,25 @@
// option2.rs
// Make me compile! Execute `rustlings hint option2` for hints
// I AM NOT DONE
fn main() {
let optional_value = Some(String::from("rustlings"));
// Make this an if let statement whose value is "Some" type
value = optional_value {
println!("the value of optional value is: {}", value);
} else {
println!("The optional value doesn't contain anything!");
}
let mut optional_values_vec: Vec<Option<i8>> = Vec::new();
for x in 1..10 {
optional_values_vec.push(Some(x));
}
// make this a while let statement - remember that vector.pop also adds another layer of Option<T>
// You can stack `Option<T>`'s into while let and if let
value = optional_values_vec.pop() {
println!("current value: {}", value);
}
}

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@ -534,6 +534,21 @@ and:
pattern matching pattern matching
""" """
[[exercises]]
name = "option2"
path = "exercises/option/option2.rs"
mode = "compile"
hint = """
check out:
https://doc.rust-lang.org/rust-by-example/flow_control/if_let.html
https://doc.rust-lang.org/rust-by-example/flow_control/while_let.html
Remember that Options can be stacked in if let and while let.
For example: Some(Some(variable)) = variable2
"""
[[exercises]] [[exercises]]
name = "result1" name = "result1"
path = "exercises/error_handling/result1.rs" path = "exercises/error_handling/result1.rs"