- Trending Categories
- Data Structure
- Operating System
- C Programming
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
The WeakMap object is a collection of key/value pairs in which the keys are weakly referenced. The keys must be objects and the values can be arbitrary values.
According to wikipedia, Weak reference is a reference that does not protect the referenced object from collection by a garbage collector, unlike a strong reference. An object referenced only by weak references – meaning "every chain of references that reaches the object includes at least one weak reference as a link" – is considered weakly reachable, and can be treated as unreachable and so may be collected at any time.
Some use cases that would otherwise cause a memory leak which can be worked around using weak maps −
Keeping private data about a specific object and only giving access to it to people with a reference to the Map.
Keeping data about library objects without changing them or incurring overhead.
Keeping data about a small set of objects where many objects of the type exist to not incur problems with hidden classes JS engines use for objects of the same type.
Keeping data about host objects like DOM nodes in the browser.
Adding a capability to an object from the outside.
- Why do we need KDD?
- Why do we need a Database
- Why do we need Good Manners?
- Why do we need Computer Networks?
- Why do we need shell scripting?
- Why do we need Data Encryption?
- Why do we need generics in Java?
- Why do we need inner classes in Java?
- Why do we need a separate Data Warehouse?
- Why do we need a wrapper class in Java?
- What is BGP and why do we need it?
- Why do we need a pure virtual destructor in C++?
- Why do we need a Valuation Approach in performing Finance Functions?
- Why do fathers need Paternity Leave?