Test on equality of maps

shallowMapEquality.js

function shallowMapEquality(map1, map2){
    if(!(map1 instanceof Map) || !(map2 instanceof Map)) 
      throw Error("One of arguments or both is/are not instance of Map");
    if(map1 === map2) return true;
    let it1 = map1[Symbol.iterator]();
    let it2 = map2[Symbol.iterator]();
    while(true){
        let {value: v1, done: d1} = it1.next();
        let {value: v2, done: d2} = it2.next();
        if(d1 === true || d2 === true) {
            if(d1 === d2) return true;
            else return false
        }
        if(v1[0] !== v2[0] || v1[1] !== v2[1]) return false;
    }
}

/// Test
let map1 = new Map([["one",1],["two",2],["three",3]]);
let map2 = new Map([["one",1],["two",2],["five",5]]);
let map3 = new Map([["one",1],["two",2],["three",3]]);
let map4 = new Map([["one",1],["two",2],["three",3],["four",4]]);
let map5 = new Map([["one",1],["two",2],["3",3]]);

shallowMapEquality(map1, map1); /// true
shallowMapEquality(map1, map2); /// false
shallowMapEquality(map1, map3); /// true
shallowMapEquality(map1, {}); /// Error
shallowMapEquality(map1, map4); /// false
shallowMapEquality(map1, map5); /// false