mutable

Mutable means they can be changed and reassigned after initialization. Here are some commonly used ones in JavaScript:

1. Arrays:
   • Arrays in JavaScript are ordered collections of elements, which can be of any data type.
2. Objects:
   • Objects in JavaScript are key-value pairs, where keys are strings (or symbols) and values can be any data type.
3. Maps:
   • Maps in JavaScript are collections of key-value pairs, similar to objects, but with some differences.
4. Sets:
   • Sets in JavaScript are collections of unique elements, where each element can only occur once.