Hashmap implementation of Javascript

hashmap.js

var hashmap = new Map(
    [
        ["aa1689", "deshan jayashanka"],
        ["aa5678", "rashmi wijayawardana"],
        ["aa1234", "laksisis gunarathna"],
        ["aa1345", "amandi kavindya"],
    ]);

console.log(hashmap);

console.log(hashmap.get("aa1689"));

console.log(hashmap.has("aa1689"));

console.log(hashmap.delete("aa1689"));

hashmap.set("aa1089", "deshan jayashanka");

console.log(hashmap);