how to check map for its key contains code example
Example 1: check if map contains key java
if (map.containsKey(key)) {
// Okay, there's a key but the value is null
} else {
// Definitely no such key
}
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