let scrollbar = Scrollbar::new(ScrollbarOrientation::VerticalRight)
    .begin_symbol(Some("↑"))
    .end_symbol(Some("↓"));

let mut scrollbar_state = ScrollbarState::new(/* items len */).position(0);

frame.render_stateful_widget(
    scrollbar,
    area.inner(&Margin {
        // using an inner vertical margin of 1 unit makes the scrollbar inside the block
        vertical: 1,
        horizontal: 0,
    }),
    &mut scrollbar_state,
);

How to fill datasets for the Chart object dynamically?

This code with static dataset elements (like in Ratatui examples) compiles fine:

    let mut datasets = Vec::new();
    
    for n in 1..10 {
        let data = vec!((S + (n as f64), Y), (E + (n as f64), Y));
        datasets.push(
            Dataset::default()
            .marker(Marker::Braille)
            .style(Style::default().fg(Color::Red))
            .graph_type(GraphType::Line)
            .data(&[(1., 2.), (3., 4.)]));
    }
    
    let chart = Chart::new(datasets);
}   

but a similar code with the dynamic array fails:

    let mut datasets = Vec::new();
    
    for n in 1..10 {
        let data = vec!((S + (n as f64), Y), (E + (n as f64), Y));
        datasets.push(
            Dataset::default()
            .marker(Marker::Braille)
            .style(Style::default().fg(Color::Red))
            .graph_type(GraphType::Line)
            .data(&data)
        );
    }
    
    let chart = Chart::new(datasets);
}   

It fails like this:

53 |             let data = vec!(((run.start as f32).into(), Y), ((run.end as f32).into(), Y));
   |                 ---- binding `data` declared here
...
60 |                 .data(data.as_slice())
   |                       ^^^^ borrowed value does not live long enough
...
63 |         }
   |         - `data` dropped here while still borrowed

How to fill datasets for the Chart object dynamically?

This code with static dataset elements (like in Ratatui examples) compiles fine:

    let mut datasets = Vec::new();
    
    for n in 1..10 {
        let data = vec!((S + (n as f64), Y), (E + (n as f64), Y));
        datasets.push(
            Dataset::default()
            .marker(Marker::Braille)
            .style(Style::default().fg(Color::Red))
            .graph_type(GraphType::Line)
            .data(&[(1., 2.), (3., 4.)])); // static array here
    }
    
    let chart = Chart::new(datasets);
}   

but a similar code with the dynamic array fails:

    let mut datasets = Vec::new();
    
    for n in 1..10 {
        let data = vec!((S + (n as f64), Y), (E + (n as f64), Y));
        datasets.push(
            Dataset::default()
            .marker(Marker::Braille)
            .style(Style::default().fg(Color::Red))
            .graph_type(GraphType::Line)
            .data(&data) // dynamic array here
        );
    }
    
    let chart = Chart::new(datasets);
}   

It fails like this:

53 |             let data = vec!(((run.start as f32).into(), Y), ((run.end as f32).into(), Y));
   |                 ---- binding `data` declared here
...
60 |                 .data(data.as_slice())
   |                       ^^^^ borrowed value does not live long enough
...
63 |         }
   |         - `data` dropped here while still borrowed

How to fill datasets for the Chart object dynamically?

This code with static dataset elements (like in Ratatui examples) compiles fine:

pub fn xds(S: f64, E: f64, Y: f64, area: Rect, buf: &mut Buffer) {
    let mut datasets = Vec::new();
    
    for n in 1..10 {
        let data = vec!((S + (n as f64), Y), (E + (n as f64), Y));
        datasets.push(
            Dataset::default()
            .marker(Marker::Braille)
            .style(Style::default().fg(Color::Red))
            .graph_type(GraphType::Line)
            .data(&[(1., 2.), (3., 4.)])); // static array here
    }
    
    let chart = Chart::new(datasets);
}   

but a similar code with the dynamic array fails:

pub fn xds(S: f64, E: f64, Y: f64, area: Rect, buf: &mut Buffer) {
    let mut datasets = Vec::new();
    
    for n in 1..10 {
        let data = vec!((S + (n as f64), Y), (E + (n as f64), Y));
        datasets.push(
            Dataset::default()
            .marker(Marker::Braille)
            .style(Style::default().fg(Color::Red))
            .graph_type(GraphType::Line)
            .data(&data) // dynamic array here
        );
    }
    
    let chart = Chart::new(datasets);
}   

It fails like this:

53 |             let data = vec!(((run.start as f32).into(), Y), ((run.end as f32).into(), Y));
   |                 ---- binding `data` declared here
...
60 |                 .data(data.as_slice())
   |                       ^^^^ borrowed value does not live long enough
...
63 |         }
   |         - `data` dropped here while still borrowed