Created
August 30, 2024 17:40
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Parse values of different types in rust, pipelined
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| use anyhow::Result; | |
| enum Numbers { | |
| One, | |
| Two, | |
| Three, | |
| } | |
| enum Names { | |
| John, | |
| Jane, | |
| Doe, | |
| } | |
| fn main() -> Result<()> { | |
| let n = vec!["One", "Two", "Three", "John", "Jane", "Doe", "Stink"]; | |
| n.into_iter() | |
| .filter_map(|x| { | |
| parse_numbers(x) | |
| .map(|n| { | |
| number_handler(n); | |
| () | |
| }) | |
| .or_else(|| { | |
| parse_names(x).map(|n| { | |
| name_handler(n); | |
| () | |
| }) | |
| }) | |
| .or_else(|| { | |
| default_handler(); | |
| Some(()) | |
| }) | |
| }) | |
| .for_each(drop); | |
| Ok(()) | |
| } | |
| fn parse_numbers(n: &str) -> Option<Numbers> { | |
| match n { | |
| "One" => Some(Numbers::One), | |
| "Two" => Some(Numbers::Two), | |
| "Three" => Some(Numbers::Three), | |
| _ => None, | |
| } | |
| } | |
| fn parse_names(n: &str) -> Option<Names> { | |
| match n { | |
| "John" => Some(Names::John), | |
| "Jane" => Some(Names::Jane), | |
| "Doe" => Some(Names::Doe), | |
| _ => None, | |
| } | |
| } | |
| fn number_handler(n: Numbers) { | |
| match n { | |
| Numbers::One => println!("One"), | |
| Numbers::Two => println!("Two"), | |
| Numbers::Three => println!("Three"), | |
| } | |
| } | |
| fn name_handler(n: Names) { | |
| match n { | |
| Names::John => println!("John"), | |
| Names::Jane => println!("Jane"), | |
| Names::Doe => println!("Doe"), | |
| } | |
| } | |
| fn default_handler() { | |
| println!("No match found"); | |
| } |
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