let myMap = new Map();
console.log(myMap.get('name')); // outputs 'Alice'
console.log(myMap.get(1)); // outputs 'numberOne'
Key Type: In Objects, the keys must be strings or symbols. Maps, on the other hand, can have keys of any type: objects, functions, or even other Maps.
Order of Elements: Objects do not guarantee the preservation of order. On the contrary, Maps maintain the insertion order of elements.
Size: Finding the size of an Object can be tedious as it doesn't have a built-in method. For a Map, it's as easy as calling the size property.
Iteration: Iterating over an Object requires extracting keys or values and then looping over them. Maps provide methods such as forEach and for..of loop to iterate directly.
When to Use What
Use Objects when the keys are related to the structure of the object and when the keys are strings or symbols.
Use Maps when the keys are unknown until runtime, you need to store heterogeneous keys, or you require insertion order.
Frequently Asked Questions
The main difference is that Map allows keys of any type and maintains the insertion order, while Object keys must be strings or symbols, and it doesn't guarantee order.
No, because they have different features and functionalities. The choice between a Map and an Object depends on specific requirements.
Which is better, Map or Object?
Neither is inherently better; it depends on the use-case. Maps offer more functionality and flexibility, but Objects have a simpler and more straightforward syntax.