var map1 = new Map();
map1.set('bar', 'foo');
console.log(map1.get('bar'));
// expected output: "foo"
console.log(map1.get('baz'));
// expected output: undefined
var map1 = new Map();map1.set('bar', 'foo');console.log(map1.get('bar'));// expected output: "foo"console.log(map1.get('baz'));// expected output: undefined