1map.keys() // The keys() method returns the keys

1const map = new Map([
2  [1970, 'bell bottoms'],
3  [1980, 'leg warmers'],
4  [1990, 'flannel'],
5])

1map.values() // The values() method returns the values:

1// Map
2Map.prototype.forEach((value, key, map) = () => {}
3
4// Array
5Array.prototype.forEach((item, index, array) = () => {}