es6 check if map has key code example

Example 1: how to check if map is map javascript

'the element' instanceof Map

Example 2: js check if map contains key

const map1 = new Map();
map1.set('bar', 'foo');

console.log(map1.has('bar'));
// expected output: true

console.log(map1.has('baz'));
// expected output: false