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| fn main() { | |
| // Match is an expression as well as a statement. This example shows how | |
| // a variable is set based on an Option enum. | |
| // ------------------------------------------ | |
| let msg_option = Some("+++MELON MELON MELON+++"); // Some variant | |
| let msg_option_empty = None; // None variant | |
| let msg = match msg_option { | |
| Some(m) => m, // m is the unwrapped data from the option | |
| None => "Out of Cheese Error", | |
| }; | |
| println!("msg = {}", msg); | |
| // As above, but handling the None variant | |
| let msg_2 = match msg_option_empty { | |
| Some(m) => m, // In this case we won't enter this branch | |
| None => "Out of Cheese Error", // msg_2 set to this value | |
| }; | |
| println!("msg_2 = {}", msg_2); | |
| } | |
| // Output: | |
| // msg = +++MELON MELON MELON+++ | |
| // msg_2 = Out of Cheese Error |
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