What is just-diff-apply?
The npm package 'just-diff-apply' is a utility that allows users to apply differences between objects or arrays. It is typically used in scenarios where changes need to be tracked and applied, such as in state management or data synchronization.
What are just-diff-apply's main functionalities?
Applying differences to objects
This feature allows you to apply a set of differences to an object. In the provided code, a difference is applied to change the value of 'a' from 3 to 4.
const diffApply = require('just-diff-apply');
const obj = {a: 3, b: 5};
const diff = [{op: 'replace', path: ['a'], value: 4}];
diffApply(obj, diff);
console.log(obj); // {a: 4, b: 5}
Applying differences to arrays
This feature enables the application of differences to arrays. In the example, an element with value 5 is added at index 1.
const diffApply = require('just-diff-apply');
const arr = [1, 2, 3];
const diff = [{op: 'add', path: [1], value: 5}];
diffApply(arr, diff);
console.log(arr); // [1, 5, 2, 3]
Other packages similar to just-diff-apply
jsondiffpatch
jsondiffpatch is a library for diffing and patching JSON-structured data. It offers more complex diffing strategies and can handle larger and more complex data structures compared to just-diff-apply.
deep-diff
deep-diff is another npm package that provides a way to observe differences between objects and arrays and apply changes. It is similar to just-diff-apply but also includes functions for reverting changes and detailed tracking of changes.
just-diff-apply
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Apply a diff object to an object.
Pass converter to apply a http://jsonpatch.com standard patch
import diffApply from 'just-diff-apply';
const obj1 = {a: 3, b: 5};
diffApply(obj1,
[
{ "op": "remove", "path": ['b'] },
{ "op": "replace", "path": ['a'], "value": 4 },
{ "op": "add", "path": ['c'], "value": 5 }
]
);
obj1;
import {diffApply, jsonPatchPathConverter} from 'just-diff-apply'
const obj2 = {a: 3, b: 5};
diffApply(obj2, [
{ "op": "remove", "path": '/b' },
{ "op": "replace", "path": '/a', "value": 4 }
{ "op": "add", "path": '/c', "value": 5 }
], jsonPatchPathConverter);
obj2;
const obj3 = {a: 4, b: [1, 2, 3]};
diffApply(obj3, [
{ "op": "replace", "path": ['a'], "value": 3 }
{ "op": "replace", "path": ['b', '2'], "value": 4 }
{ "op": "add", "path": ['b', '3'], "value": 9 }
]);
obj3;
const obj4 = {a: 4, b: {c: 3}};
diffApply(obj4, [
{ "op": "replace", "path": ['a'], "value": 5 }
{ "op": "remove", "path": ['b', 'c']}
{ "op": "add", "path": ['b', 'd'], "value": 4 }
]);
obj4;