map-set.js

let testArray = Array(1000000).fill().map((_, i) => i * i);

let testMap = new Map();
testArray.forEach(item => testMap.set(item, item));

const find = () => {
    console.time('Array find');
    testArray.find(val => val == 9604)
    console.timeEnd('Array find');
};

const getFromMap = () => {
    console.time('Map get');
    testMap.get(9604);
    console.timeEnd('Map get');
}

find();
find();
find();

console.log('-------------')

getFromMap();
getFromMap();
getFromMap();