JavaScript Tutorial
JavaScript Maps: Syntax, Methods, Examples
Table of Contents
- Introduction
- What Are Maps in JavaScript?
- JavaScript Map Syntax
- JavaScript Map Methods
- How to Create a Map in JavaScript
- JavaScript Maps vs Objects
- Why Use JavaScript Maps?
- Benefits of Using JS Maps
- Limitations of Using JS Maps
FAQs Related to JS Maps
Maps allow keys of any data tye and maintain insertion order, while objects restrict keys to strings or symbols and don’t guarantee order.
No, Maps do not allow duplicate keys; new values overwrite existing ones.
Yes, Maps are iterable and support for...of loops or iterator methods like keys() and entries().
Use the clear() method:
map.clear();
Maps support keys of any data type, including objects, numbers, and functions.
No, Maps are not directly compatible with JSON. Convert them to plain objects or arrays first.
No, the .map() method is for arrays and unrelated to the Map object.
