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es6-weak-map

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es6-weak-map

ECMAScript6 WeakMap polyfill

  • 2.0.3
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What is es6-weak-map?

The es6-weak-map npm package provides a polyfill for the ES6 WeakMap implementation. It allows for the creation of collections of key/value pairs where the keys are objects and the values can be arbitrary values. The key feature of WeakMaps is that they do not prevent garbage collection if there are no other references to the key object, making them useful for managing memory in large applications.

What are es6-weak-map's main functionalities?

Creating and using a WeakMap

This code demonstrates how to create a WeakMap, add a key/value pair to it, retrieve the value using the key, and then allow the key to be garbage collected by removing references to it.

{"var WeakMap = require('es6-weak-map');\nvar myWeakMap = new WeakMap();\nvar obj = {};\nmyWeakMap.set(obj, 'value');\nconsole.log(myWeakMap.get(obj)); // 'value'\nobj = null; // Now obj can be garbage collected if no other references exist"}

Checking for a key's presence and deleting a key

This example shows how to check if a WeakMap contains a certain key using the `has` method and how to remove a key/value pair from the WeakMap using the `delete` method.

{"var WeakMap = require('es6-weak-map');\nvar myWeakMap = new WeakMap();\nvar obj = {};\nmyWeakMap.set(obj, 'value');\nconsole.log(myWeakMap.has(obj)); // true\nmyWeakMap.delete(obj);\nconsole.log(myWeakMap.has(obj)); // false"}

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Package last updated on 07 Jun 2019

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