Options exercises complete
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exercises/option
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@ -1,23 +1,20 @@
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// option1.rs
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// Make me compile! Execute `rustlings hint option1` for hints
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// I AM NOT DONE
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// you can modify anything EXCEPT for this function's sig
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fn print_number(maybe_number: Option<u16>) {
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println!("printing: {}", maybe_number.unwrap());
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}
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fn main() {
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print_number(13);
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print_number(99);
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print_number(Some(13));
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print_number(Some(99));
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let mut numbers: [Option<u16>; 5];
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let mut numbers: [Option<u16>; 5] = [None; 5];
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for iter in 0..5 {
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let number_to_add: u16 = {
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((iter * 1235) + 2) / (4 * 16)
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};
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let number_to_add: u16 = { ((iter * 1235) + 2) / (4 * 16) };
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numbers[iter as usize] = number_to_add;
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numbers[iter as usize] = Some(number_to_add);
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print_number(numbers[iter as usize])
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}
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}
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@ -1,12 +1,10 @@
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// option2.rs
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// Make me compile! Execute `rustlings hint option2` for hints
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// I AM NOT DONE
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fn main() {
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let optional_value = Some(String::from("rustlings"));
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// TODO: Make this an if let statement whose value is "Some" type
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value = optional_value {
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if let Some(value) = optional_value {
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println!("the value of optional value is: {}", value);
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} else {
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println!("The optional value doesn't contain anything!");
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@ -19,7 +17,7 @@ fn main() {
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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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value = optional_values_vec.pop() {
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while let Some(Some(value)) = optional_values_vec.pop() {
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println!("current value: {}", value);
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}
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}
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