<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<Script>
let map = new Map();
map.set('name', 'John');
map.set('age', 30);
map.set('profession', 'Developer');
console.log(map.get('name')); // John
console.log(map.size); // 3
map.delete('age');
console.log(map.has('age')); // false
</Script>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<Script>
let countries = new Map();
countries.set('USA', 'Washington, D.C.');
countries.set('France', 'Paris');
countries.set('Japan', 'Tokyo');
console.log(countries.get('USA')); // Washington, D.C.
console.log(countries.size); // 3
</Script>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<Script>
let fruits = new Map([
['apple', 1],
['banana', 2],
['orange', 3]
]);
fruits.forEach((value, key) => {
console.log(`${key}: ${value}`);
});
</Script>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<Script>
let set = new Set();
set.add(1);
set.add(5);
set.add(1); // Duplicate values are ignored
set.add(10);
console.log(set.size); // 3
console.log(set.has(5)); // true
set.delete(1);
console.log(set.has(1)); // false
</Script>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<Script>
let numbers = new Set([1, 2, 3, 4, 4, 5, 6]);
console.log(numbers.size); // 6 (4 is only counted once)
</Script>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<Script>
let letters = new Set(['a', 'b', 'c', 'd']);
console.log(letters.has('c')); // true
console.log(letters.has('z')); // false
</Script>
</body>
</html>