test: Convert main function to working tests
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@ -3,23 +3,34 @@
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// I AM NOT DONE
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fn main() {
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let optional_word = Some(String::from("rustlings"));
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// TODO: Make this an if let statement whose value is "Some" type
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word = optional_word {
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println!("The word is: {}", word);
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} else {
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println!("The optional word doesn't contain anything");
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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 simple_option() {
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let target = "rustlings";
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let optional_target = Some(target);
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// TODO: Make this an if let statement whose value is "Some" type
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if let Some(word) = optional_target {
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assert_eq!(word, target);
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}
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}
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let mut optional_integers_vec: Vec<Option<i8>> = Vec::new();
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for x in 1..10 {
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optional_integers_vec.push(Some(x));
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}
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#[test]
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fn layered_option() {
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let mut range = 10;
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let mut optional_integers: Vec<Option<i8>> = Vec::new();
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for i in 0..(range + 1) {
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optional_integers.push(Some(i));
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}
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// TODO: make this a while let statement - remember that vector.pop also adds another layer of Option<T>
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// You can stack `Option<T>`'s into while let and if let
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integer = optional_integers_vec.pop() {
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println!("current value: {}", integer);
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// TODO: make this a while let statement - remember that vector.pop also adds another layer of Option<T>
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// You can stack `Option<T>`'s into while let and if let
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while let Some(Some(integer)) = optional_integers.pop() {
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assert_eq!(integer, range);
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range -= 1;
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}
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}
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}
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@ -545,7 +545,7 @@ is the easiest, but how do you do it safely so that it doesn't panic in your fac
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[[exercises]]
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name = "options2"
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path = "exercises/options/options2.rs"
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mode = "compile"
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mode = "test"
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hint = """
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check out:
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https://doc.rust-lang.org/rust-by-example/flow_control/if_let.html
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