Task model

Define the Todo struct and its fields.

Todo list: the model

In this project we'll write a small todo list that runs from the command line: adding tasks, listing, marking as done and reading commands. The first step is modelling the data. Every task has an id, a text and a done state:

struct Gorev {
    id: u32,
    metin: String,
    bitti: bool,
}

We chose String for metin because the task should own its text; if we held a &str, the text would have to live somewhere else.

Showing a task

Let a method decide how the task looks on screen. Finished tasks will be shown with [x], the others with [ ]:

impl Gorev {
    fn goster(&self) -> String {
        let isaret = if self.bitti { "x" } else { " " };
        format!("[{}] {}: {}", isaret, self.id, self.metin)
    }
}

Since the method returns a String, printing, testing or saving the result to a file can all use the same code.

Exercise First task

Add the method fn goster(&self) -> String to the Gorev struct. Create the task with id: 1, metin: "Süt al" and bitti: false, and print the result of goster().

Show example solution

struct Gorev {
    id: u32,
    metin: String,
    bitti: bool,
}

impl Gorev {
    fn goster(&self) -> String {
        let isaret = if self.bitti { "x" } else { " " };
        format!("[{}] {}: {}", isaret, self.id, self.metin)
    }
}

fn main() {
    let g = Gorev {
        id: 1,
        metin: String::from("Süt al"),
        bitti: false,
    };
    println!("{}", g.goster());
}

Test yourself

Which type best fits a task's done state?
- u8
- Option<String>
- bool
- String
Show answer

bool — For two-state information (done/not done), bool is both clear and safe.

Pick the mark

let isaret = ____ self.bitti { "x" } else { " " };

Show answer

let isaret = if self.bitti { "x" } else { " " };

Field and type

id

u32
metin

String
bitti

bool
goster()

-> String

Next lesson: Adding

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