JS maps (key - value pair)

map.js

// MAP (key-value pair)

const map = new Map();

const key1 = 'string key',
	key2 = {},
	key3 = function () {};
map.set(key1, 'value of key1');
map.set(key2, 'value of key2');
map.set(key3, 'value of key3');

console.log(map.get(key1));
console.log(map.size);

// Iterating
for (let [key, value] of map) {
	console.log(`${key} = ${value}`);
}
for (let key of map.keys()) {
	console.log(key);
}
for (let value of map.values()) {
	console.log(value);
}
map.forEach(function (value, key) {
	console.log(`${key} = ${value}`);
});

// Convert to Array
const keyValArr = Array.from(map);
const valArr = Array.from(map.values());
const keyArr = Array.from(map.keys());