Keyed Collections

These collections use keys for data management:

• Map: Stores key-value pairs with any data type as keys. Example: let map = new Map(); map.set('key', 'value'); console.log(map.get('key')); outputs value.
  
• Set: Stores unique values. For instance, let set = new Set([1, 2, 2, 3]); console.log(set.has(2)); returns true.
  
• WeakMap and WeakSet: Allow for objects to be h...