Collections Basics

let mut v = vec![1, 2, 3];
v.push(4);

use std::collections::HashMap;
let mut m = HashMap::new();
m.insert("port", 8080);

use std::collections::BTreeMap;
let mut m = BTreeMap::new();
m.insert(3, "c");
m.insert(1, "a");

use std::collections::HashSet;
let s: HashSet<_> = [1, 2, 2].into_iter().collect();

use std::collections::VecDeque;
let mut q = VecDeque::from([1, 2]);
q.push_front(0);

use std::collections::BinaryHeap;
let mut h = BinaryHeap::from([3, 1, 2]);
assert_eq!(h.pop(), Some(3));

let mut v = Vec::with_capacity(1000);