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# deep-diff [](https://travis-ci.org/flitbit/diff) [](https://nodei.co/npm/deep-diff/) **deep-diff** is a javascript/node.js module providing utility functions for determining the structural differences between objects and includes some utilities for applying differences across objects. ## Features * Get the structural differences between two objects. * Observe the structural differences between two objects. * When structural differences represent change, apply change from one object to another. * When structural differences represent change, selectively apply change from one object to another. ## ChangeLog `0.3.8` - 2017-05-03 * reconciled recently introduced difference between `index.es.js` and `index.js` * improved npm commands for more reliable contributions * added a few notes to README regarding contributing. `0.3.7` - 2017-05-01 * fixed issue #98 by merging @sberan's pull request #99 &mdash; better handling of property with `undefined` value existing on either operand. Unit tests supplied. `0.3.6` - 2017-04-25 &mdash; Fixed, closed lingering issues: * fixed #74 &mdash; comparing objects with longer cycles * fixed #70 &mdash; was not properly detecting a deletion when a property on the operand (lhs) had a value of `undefined` and was _undefined_ on the comparand (rhs). :o). * WARNING! [Still broken when importing in Typescript](https://github.com/flitbit/diff/issues/97). `0.3.5` - 2017-04-23 &mdash; Rolled up recent fixes; patches: * @stevemao &mdash; #79, #80: now testing latest version of node4 * @mortonfox &mdash; #85: referencing mocha's new home * @tdebarochez &mdash; #90: fixed error when .toString not a function * @thiamsantos &mdash; #92, #93: changed module system for improved es2015 modules. WARNING! [This PR broke importing `deep-diff` in Typescript as reported by @kgentes in #97](https://github.com/flitbit/diff/issues/97) `0.3.4` - Typescript users, reference this version until #97 is fixed! `0.3.3` - Thanks @SimenB: enabled npm script for release (alternate to the Makefile). Also linting as part of `npm test`. Thanks @joeldenning: Fixed issue #35; diffs of top level arrays now working. `0.3.3` - Thanks @SimenB: enabled npm script for release (alternate to the Makefile). Also linting as part of `npm test`. Thanks @joeldenning: Fixed issue #35; diffs of top level arrays now working. `0.3.2` - Resolves #46; support more robust filters by including `lhs` and `rhs` in the filter callback. By @Orlando80 `0.3.1` - Better type checking by @Drinks, UMD wrapper by @SimenB. Now certifies against nodejs 12 and iojs (Thanks @SimenB). `0.2.0` - [Fixes Bug #17](https://github.com/flitbit/diff/issues/17), [Fixes Bug #19](https://github.com/flitbit/diff/issues/19), [Enhancement #21](https://github.com/flitbit/diff/issues/21) Applying changes that are properly structured can now be applied as a change (no longer requires typeof Diff) - supports differences being applied after round-trip serialization to JSON format. Prefilter now reports the path of all changes - it was not showing a path for arrays and anything in the structure below (reported by @ravishvt). *Breaking Change* &ndash; The structure of change records for differences below an array element has changed. Array indexes are now reported as numeric elements in the `path` if the changes is merely edited (an `E` kind). Changes of kind `A` (array) are only reported for changes in the terminal array itself and will have a nested `N` (new) item or a nested `D` (deleted) item. `0.1.7` - [Enhancement #11](https://github.com/flitbit/diff/issues/11) Added the ability to filter properties that should not be analyzed while calculating differences. Makes `deep-diff` more usable with frameworks that attach housekeeping properties to existing objects. AngularJS does this, and the new filter ability should ease working with it. `0.1.6` - Changed objects within nested arrays can now be applied. They were previously recording the changes appropriately but `applyDiff` would error. Comparison of `NaN` works more sanely - comparison to number shows difference, comparison to another `Nan` does not. ## Installation ``` npm install deep-diff ``` For the browser, you can install with [bower](http://bower.io/): ``` bower install deep-diff ``` ## Tests Tests use [mocha](http://mochajs.org/) and [expect.js](https://github.com/LearnBoost/expect.js/), so if you clone the [github repository](https://github.com/flitbit/json-ptr) you'll need to run: ```bash npm install ``` ... followed by ... ```bash npm test ``` ... or ... ```bash mocha -R spec ``` ### Importing **nodejs** ```javascript var deep = require('deep-diff') ``` **browser** ```html <script src="deep-diff-0.3.1.min.js"></script> ``` > Minified, browser release of the current version of the module is under the `releases` folder. > In a browser, `deep-diff` defines a global variable `DeepDiff`. If there is a conflict in the global namespace you can restore the conflicting definition and assign `deep-diff` to another variable like this: `var deep = DeepDiff.noConflict();`. ## Simple Examples In order to describe differences, change revolves around an `origin` object. For consistency, the `origin` object is always the operand on the `left-hand-side` of operations. The `comparand`, which may contain changes, is always on the `right-hand-side` of operations. ``` javascript var diff = require('deep-diff').diff; var lhs = { name: 'my object', description: 'it\'s an object!', details: { it: 'has', an: 'array', with: ['a', 'few', 'elements'] } }; var rhs = { name: 'updated object', description: 'it\'s an object!', details: { it: 'has', an: 'array', with: ['a', 'few', 'more', 'elements', { than: 'before' }] } }; var differences = diff(lhs, rhs); ``` *up to v 0.1.7* The code snippet above would result in the following structure describing the differences: ``` javascript // Versions < 0.2.0 [ { kind: 'E', path: [ 'name' ], lhs: 'my object', rhs: 'updated object' }, { kind: 'A', path: [ 'details', 'with' ], index: 2, item: { kind: 'E', path: [], lhs: 'elements', rhs: 'more' } }, { kind: 'A', path: [ 'details', 'with' ], index: 3, item: { kind: 'N', rhs: 'elements' } }, { kind: 'A', path: [ 'details', 'with' ], index: 4, item: { kind: 'N', rhs: { than: 'before' } } } ] ``` *v 0.2.0 and above* The code snippet above would result in the following structure describing the differences: ``` javascript [ { kind: 'E', path: [ 'name' ], lhs: 'my object', rhs: 'updated object' }, { kind: 'E', path: [ 'details', 'with', 2 ], lhs: 'elements', rhs: 'more' }, { kind: 'A', path: [ 'details', 'with' ], index: 3, item: { kind: 'N', rhs: 'elements' } }, { kind: 'A', path: [ 'details', 'with' ], index: 4, item: { kind: 'N', rhs: { than: 'before' } } } ] ``` ### Differences Differences are reported as one or more change records. Change records have the following structure: * `kind` - indicates the kind of change; will be one of the following: * `N` - indicates a newly added property/element * `D` - indicates a property/element was deleted * `E` - indicates a property/element was edited * `A` - indicates a change occurred within an array * `path` - the property path (from the left-hand-side root) * `lhs` - the value on the left-hand-side of the comparison (undefined if kind === 'N') * `rhs` - the value on the right-hand-side of the comparison (undefined if kind === 'D') * `index` - when kind === 'A', indicates the array index where the change occurred * `item` - when kind === 'A', contains a nested change record indicating the change that occurred at the array index Change records are generated for all structural differences between `origin` and `comparand`. The