Current Dev State

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Tim Lorsbach
2025-06-23 20:13:54 +02:00
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MIT License
Copyright (c) 2017 Evgeny Poberezkin
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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# fast-deep-equal
The fastest deep equal
[![Build Status](https://travis-ci.org/epoberezkin/fast-deep-equal.svg?branch=master)](https://travis-ci.org/epoberezkin/fast-deep-equal)
[![npm version](https://badge.fury.io/js/fast-deep-equal.svg)](http://badge.fury.io/js/fast-deep-equal)
[![Coverage Status](https://coveralls.io/repos/github/epoberezkin/fast-deep-equal/badge.svg?branch=master)](https://coveralls.io/github/epoberezkin/fast-deep-equal?branch=master)
## Install
```bash
npm install fast-deep-equal
```
## Features
- ES5 compatible
- works in node.js (0.10+) and browsers (IE9+)
- checks equality of Date and RegExp objects by value.
## Usage
```javascript
var equal = require('fast-deep-equal');
console.log(equal({foo: 'bar'}, {foo: 'bar'})); // true
```
## Performance benchmark
```
fast-deep-equal x 82,915 ops/sec ±0.63% (89 runs sampled)
nano-equal x 50,506 ops/sec ±2.23% (86 runs sampled)
shallow-equal-fuzzy x 14,873 ops/sec ±3.19% (83 runs sampled)
underscore.isEqual x 16,055 ops/sec ±2.29% (85 runs sampled)
lodash.isEqual x 10,740 ops/sec ±1.04% (89 runs sampled)
deep-equal x 12,276 ops/sec ±2.44% (84 runs sampled)
deep-eql x 10,565 ops/sec ±0.89% (90 runs sampled)
assert.deepStrictEqual x 965 ops/sec ±2.99% (81 runs sampled)
The fastest is fast-deep-equal
```
To run benchmark (requires node.js 6+):
```bash
npm install
node benchmark
```
## License
[MIT](https://github.com/epoberezkin/fast-deep-equal/blob/master/LICENSE)

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'use strict';
const assertDeepStrictEqual = require('assert').deepStrictEqual;
const tests = require('../spec/tests');
const Benchmark = require('benchmark');
const suite = new Benchmark.Suite;
const equalPackages = {
'fast-deep-equal': require('../index'),
'nano-equal': true,
'shallow-equal-fuzzy': true,
'underscore.isEqual': require('underscore').isEqual,
'lodash.isEqual': require('lodash').isEqual,
'deep-equal': true,
'deep-eql': true,
'assert.deepStrictEqual': (a, b) => {
try { assertDeepStrictEqual(a, b); return true; }
catch(e) { return false; }
}
};
for (const equalName in equalPackages) {
let equalFunc = equalPackages[equalName];
if (equalFunc === true) equalFunc = require(equalName);
for (const testSuite of tests) {
for (const test of testSuite.tests) {
try {
if (equalFunc(test.value1, test.value2) !== test.equal)
console.error('different result', equalName, testSuite.description, test.description);
} catch(e) {
console.error(equalName, testSuite.description, test.description, e);
}
}
}
suite.add(equalName, function() {
for (const testSuite of tests) {
for (const test of testSuite.tests) {
if (test.description != 'pseudo array and equivalent array are not equal')
equalFunc(test.value1, test.value2);
}
}
});
}
console.log();
suite
.on('cycle', (event) => console.log(String(event.target)))
.on('complete', function () {
console.log('The fastest is ' + this.filter('fastest').map('name'));
})
.run({async: true});

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'use strict';
module.exports = function equal(a, b) {
if (a === b) return true;
var arrA = Array.isArray(a)
, arrB = Array.isArray(b)
, i;
if (arrA && arrB) {
if (a.length != b.length) return false;
for (i = 0; i < a.length; i++)
if (!equal(a[i], b[i])) return false;
return true;
}
if (arrA != arrB) return false;
if (a && b && typeof a === 'object' && typeof b === 'object') {
var keys = Object.keys(a);
if (keys.length !== Object.keys(b).length) return false;
var dateA = a instanceof Date
, dateB = b instanceof Date;
if (dateA && dateB) return a.getTime() == b.getTime();
if (dateA != dateB) return false;
var regexpA = a instanceof RegExp
, regexpB = b instanceof RegExp;
if (regexpA && regexpB) return a.toString() == b.toString();
if (regexpA != regexpB) return false;
for (i = 0; i < keys.length; i++)
if (!Object.prototype.hasOwnProperty.call(b, keys[i])) return false;
for (i = 0; i < keys.length; i++)
if(!equal(a[keys[i]], b[keys[i]])) return false;
return true;
}
return false;
};

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{
"_from": "fast-deep-equal@^1.0.0",
"_id": "fast-deep-equal@1.0.0",
"_inBundle": false,
"_integrity": "sha1-liVqO8l1WV6zbYLpkp0GDYk0Of8=",
"_location": "/fast-deep-equal",
"_phantomChildren": {},
"_requested": {
"type": "range",
"registry": true,
"raw": "fast-deep-equal@^1.0.0",
"name": "fast-deep-equal",
"escapedName": "fast-deep-equal",
"rawSpec": "^1.0.0",
"saveSpec": null,
"fetchSpec": "^1.0.0"
},
"_requiredBy": [
"/ajv"
],
"_resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-1.0.0.tgz",
"_shasum": "96256a3bc975595eb36d82e9929d060d893439ff",
"_spec": "fast-deep-equal@^1.0.0",
"_where": "/home/manfred/enviPath/ketcher2/ketcher/node_modules/ajv",
"author": {
"name": "Evgeny Poberezkin"
},
"bugs": {
"url": "https://github.com/epoberezkin/fast-deep-equal/issues"
},
"bundleDependencies": false,
"deprecated": false,
"description": "Fast deep equal",
"devDependencies": {
"benchmark": "^2.1.4",
"coveralls": "^2.13.1",
"deep-eql": "^2.0.2",
"deep-equal": "^1.0.1",
"eslint": "^4.0.0",
"lodash": "^4.17.4",
"mocha": "^3.4.2",
"nano-equal": "^1.0.1",
"nyc": "^11.0.2",
"pre-commit": "^1.2.2",
"shallow-equal-fuzzy": "0.0.2",
"underscore": "^1.8.3"
},
"homepage": "https://github.com/epoberezkin/fast-deep-equal#readme",
"keywords": [
"fast",
"equal",
"deep-equal"
],
"license": "MIT",
"main": "index.js",
"name": "fast-deep-equal",
"nyc": {
"exclude": [
"**/spec/**",
"node_modules"
],
"reporter": [
"lcov",
"text-summary"
]
},
"repository": {
"type": "git",
"url": "git+https://github.com/epoberezkin/fast-deep-equal.git"
},
"scripts": {
"eslint": "eslint *.js benchmark spec",
"test": "npm run eslint && npm run test-cov",
"test-cov": "nyc npm run test-spec",
"test-spec": "mocha spec/*.spec.js -R spec"
},
"version": "1.0.0"
}

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'use strict';
var equal = require('../index');
var tests = require('./tests');
var assert = require('assert');
describe('equal', function() {
tests.forEach(function (suite) {
describe(suite.description, function() {
suite.tests.forEach(function (test) {
it(test.description, function() {
assert.strictEqual(equal(test.value1, test.value2), test.equal);
});
});
});
});
});

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'use strict';
module.exports = [
{
description: 'scalars',
tests: [
{
description: 'equal numbers',
value1: 1,
value2: 1,
equal: true
},
{
description: 'not equal numbers',
value1: 1,
value2: 2,
equal: false
},
{
description: 'number and array are not equal',
value1: 1,
value2: [],
equal: false
},
{
description: '0 and null are not equal',
value1: 0,
value2: null,
equal: false
},
{
description: 'equal strings',
value1: 'a',
value2: 'a',
equal: true
},
{
description: 'not equal strings',
value1: 'a',
value2: 'b',
equal: false
},
{
description: 'empty string and null are not equal',
value1: '',
value2: null,
equal: false
},
{
description: 'null is equal to null',
value1: null,
value2: null,
equal: true
},
{
description: 'equal booleans (true)',
value1: true,
value2: true,
equal: true
},
{
description: 'equal booleans (false)',
value1: false,
value2: false,
equal: true
},
{
description: 'not equal booleans',
value1: true,
value2: false,
equal: false
},
{
description: '1 and true are not equal',
value1: 1,
value2: true,
equal: false
},
{
description: '0 and false are not equal',
value1: 0,
value2: false,
equal: false
}
]
},
{
description: 'objects',
tests: [
{
description: 'empty objects are equal',
value1: {},
value2: {},
equal: true
},
{
description: 'equal objects (same properties "order")',
value1: {a: 1, b: '2'},
value2: {a: 1, b: '2'},
equal: true
},
{
description: 'equal objects (different properties "order")',
value1: {a: 1, b: '2'},
value2: {b: '2', a: 1},
equal: true
},
{
description: 'not equal objects (extra property)',
value1: {a: 1, b: '2'},
value2: {a: 1, b: '2', c: []},
equal: false
},
{
description: 'not equal objects (different properties)',
value1: {a: 1, b: '2', c: 3},
value2: {a: 1, b: '2', d: 3},
equal: false
},
{
description: 'not equal objects (different properties)',
value1: {a: 1, b: '2', c: 3},
value2: {a: 1, b: '2', d: 3},
equal: false
},
{
description: 'equal objects (same sub-properties)',
value1: { a: [ { b: 'c' } ] },
value2: { a: [ { b: 'c' } ] },
equal: true
},
{
description: 'not equal objects (different sub-property value)',
value1: { a: [ { b: 'c' } ] },
value2: { a: [ { b: 'd' } ] },
equal: false
},
{
description: 'not equal objects (different sub-property)',
value1: { a: [ { b: 'c' } ] },
value2: { a: [ { c: 'c' } ] },
equal: false
},
{
description: 'empty array and empty object are not equal',
value1: {},
value2: [],
equal: false
},
{
description: 'object with extra undefined properties are not equal #1',
value1: {},
value2: {foo: undefined},
equal: false
},
{
description: 'object with extra undefined properties are not equal #2',
value1: {foo: undefined},
value2: {},
equal: false
},
{
description: 'object with extra undefined properties are not equal #3',
value1: {foo: undefined},
value2: {bar: undefined},
equal: false
}
]
},
{
description: 'arrays',
tests: [
{
description: 'two empty arrays are equal',
value1: [],
value2: [],
equal: true
},
{
description: 'equal arrays',
value1: [1, 2, 3],
value2: [1, 2, 3],
equal: true
},
{
description: 'not equal arrays (different item)',
value1: [1, 2, 3],
value2: [1, 2, 4],
equal: false
},
{
description: 'not equal arrays (different length)',
value1: [1, 2, 3],
value2: [1, 2],
equal: false
},
{
description: 'equal arrays of objects',
value1: [{a: 'a'}, {b: 'b'}],
value2: [{a: 'a'}, {b: 'b'}],
equal: true
},
{
description: 'not equal arrays of objects',
value1: [{a: 'a'}, {b: 'b'}],
value2: [{a: 'a'}, {b: 'c'}],
equal: false
},
{
description: 'pseudo array and equivalent array are not equal',
value1: {'0': 0, '1': 1, length: 2},
value2: [0, 1],
equal: false
}
]
},
{
description: 'Date objects',
tests: [
{
description: 'equal date objects',
value1: new Date('2017-06-16T21:36:48.362Z'),
value2: new Date('2017-06-16T21:36:48.362Z'),
equal: true
},
{
description: 'not equal date objects',
value1: new Date('2017-06-16T21:36:48.362Z'),
value2: new Date('2017-01-01T00:00:00.000Z'),
equal: false
},
{
description: 'date and string are not equal',
value1: new Date('2017-06-16T21:36:48.362Z'),
value2: '2017-06-16T21:36:48.362Z',
equal: false
},
{
description: 'date and object are not equal',
value1: new Date('2017-06-16T21:36:48.362Z'),
value2: {},
equal: false
}
]
},
{
description: 'RegExp objects',
tests: [
{
description: 'equal RegExp objects',
value1: /foo/,
value2: /foo/,
equal: true
},
{
description: 'not equal RegExp objects (different pattern)',
value1: /foo/,
value2: /bar/,
equal: false
},
{
description: 'not equal RegExp objects (different flags)',
value1: /foo/,
value2: /foo/i,
equal: false
},
{
description: 'RegExp and string are not equal',
value1: /foo/,
value2: 'foo',
equal: false
},
{
description: 'RegExp and object are not equal',
value1: /foo/,
value2: {},
equal: false
}
]
},
{
description: 'sample objects',
tests: [
{
description: 'big object',
value1: {
prop1: 'value1',
prop2: 'value2',
prop3: 'value3',
prop4: {
subProp1: 'sub value1',
subProp2: {
subSubProp1: 'sub sub value1',
subSubProp2: [1, 2, {prop2: 1, prop: 2}, 4, 5]
}
},
prop5: 1000,
prop6: new Date(2016, 2, 10)
},
value2: {
prop5: 1000,
prop3: 'value3',
prop1: 'value1',
prop2: 'value2',
prop6: new Date('2016/03/10'),
prop4: {
subProp2: {
subSubProp1: 'sub sub value1',
subSubProp2: [1, 2, {prop2: 1, prop: 2}, 4, 5]
},
subProp1: 'sub value1'
}
},
equal: true
}
]
}
];