Get an Option<Vec<_>> from Option<struct: Option<Vec>>

pull_out_vec_option_from_struct_member.rs

extern crate serde_json;
#[derive(Debug)]
struct Foo {
    bar: Option<Vec<&'static str>>
}

fn show(f: Option<Foo>) {
    let v = f.and_then(|f1| f1.bar);
    println!("vec == {:?}", v);
}

fn main() {

    
    let bah = Some(Foo{ bar: Some(vec!["ddd","ggg","hhh"])});
    let bah2 = Some(Foo{ bar: None });
    let bah3 = None;
    
    show(bah);
    show(bah2);
    show(bah3);
    
}