structural-sharing

js-structural-sharing

Tests whether two objects (recursively) have structural sharing. In other words, whether they access a common memory location. If the exported method shareMemory returns false then each of the objects can be modified, anywhere in its graph, without affecting the other.

Installation

npm install structural-sharing --save

Usage

 
  import {shareMemory} from 'structural-sharing'
 

Examples

 
   import {shareMemory} from 'structural-sharing'
   const o = {};
   const a1 = {a1: {a2: {v:1, y:2}, a3: o}, a4: [1,2,3,4]};
   const a2 = {a1: {a2: [1, 2,3, [1, 3, [1, 2, o]]]}, a4: [1,2,3,4]};           
   assert.isTrue(shareMemory(o, a1));
   assert.isTrue(shareMemory(o, a2));
   assert.isTrue(shareMemory(a1, a2));
   assert.isFalse(shareMemory(a1, JSON.parse(JSON.stringify(a2))));   
 

For more examples look in file test.js

Tests

npm test