fn main() {
let mut scovilles = std::collections::HashMap::new();
println!("scovilles = {:?}", scovilles);
scovilles.insert("reaper", 2_000_000);
println!("scovilles = {:?}", scovilles);
let habanero = *scovilles.entry("habanero").or_insert(0);
println!("{}", habanero);
}
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