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minimal-object-diff
Advanced tools
Create minimal diffs between two objects for sending over a network
Create and apply a tiny representation of diffs between two objects. Useful for sending diffs over a network
The goal if minimal-object-diff
is to generate a small representation of the diff between two objects in order to later send it over a network.
The use case in mind when writing was a game server. For a networked game you'll typically push down JSON to clients in order to update them on the world around them.
This library was created to power a simple utility for sending down the minimum amount of data necessary to keep a client up to date with its knowledge of world state.
$ npm install --save minimal-object-diff
// On our server
var objDiff = require('minimal-object-diff')
var oldClientKnowledge = { numBeavers: 50, foo: { bar: 'buzz' } }
var newClientKnowledge = { nothing: ':(' }
var patches = objDiff.diff(oldClientKnowledge, newClientKnowledge)
SendPatchesViaWebsocket(patches)
// Later on the client side
var objDiff = require('minimal-object-diff')
console.log(myOldClientKnowledge)
// { numBeavers: 50, foo: { bar: 'buzz' } }
var myNewClientKnowledge = objDiff.patch(myOldClientKnowledge, JSON.parse(patches))
console.log(myNewClientKnowledge)
// { nothing: ':(' }
var a = {
name: 'Eugene',
number: 42,
tags: ['tag1', 'tag2', 'tag3'],
scores: {
tetris: 1000,
carmageddon: 3
}
}
var b = {
name: 'Susan',
number: 43,
tags: ['tag1', 'tag4'],
scores: {
carmageddon: 3,
zelda: 3000
},
age: 37
}
*/
console.log(objDiff.diff(a, b))
/*
{
x: {
name: 'Susan',
number: 43,
tags: ['tag1', 'tag4'],
scores: {
zelda: 3000
},
age: 37
},
d: ['scores.zelda']
}
*/
objDiff.diff(oldObj, newObj)
-> patches
Required Parameter
Type: Object
The old object that your patches later get applied to
Required Parameter
Type: Object
The new object that your patches will lead to
Returned
Type: Object || Array || null
The patches that when applied transform oldObj
-> newObj
objDiff.patch(oldObj, patches)
-> newObj
Required Parameter
Type: Object
The old object that your patches get applied to
Required Parameter
Type: Object || Array || null
The patches that when applied transform oldObj
-> newObj
Returned
The new object that your patches will lead to
changeset
MIT
FAQs
Create minimal diffs between two objects for sending over a network
The npm package minimal-object-diff receives a total of 13 weekly downloads. As such, minimal-object-diff popularity was classified as not popular.
We found that minimal-object-diff demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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