- extend
Merge HashMaps (extend)
- If the same key appears twice, the value of the second one wins.
examples/hashes/merge/src/main.rs
use std::collections::HashMap; fn main() { let a = HashMap::from([ ("apple", 1), ("banana", 1), ]); let b = HashMap::from([ ("apple", 2), ("peach", 2), ("grape", 2), ]); let mut total: HashMap<&str, i32> = HashMap::new(); total.extend(a); println!("{:#?}", total); total.extend(b); println!("{:#?}", total); }
{ "apple": 1, "banana": 1, } { "peach": 2, "banana": 1, "grape": 2, "apple": 2, }