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# dequal [](https://github.com/lukeed/dequal/actions)
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> A tiny (304B to 489B) utility to check for deep equality
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This module supports comparison of all types, including `Function`, `RegExp`, `Date`, `Set`, `Map`, `TypedArray`s, `DataView`, `null`, `undefined`, and `NaN` values. Complex values (eg, Objects, Arrays, Sets, Maps, etc) are traversed recursively.
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> **Important:**
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> * key order **within Objects** does not matter
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> * value order **within Arrays** _does_ matter
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> * values **within Sets and Maps** use value equality
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> * keys **within Maps** use value equality
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## Install
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```
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$ npm install --save dequal
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```
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## Modes
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There are two "versions" of `dequal` available:
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#### `dequal`
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> **Size (gzip):** 489 bytes<br>
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> **Availability:** [CommonJS](https://unpkg.com/dequal/dist/index.js), [ES Module](https://unpkg.com/dequal/dist/index.mjs), [UMD](https://unpkg.com/dequal/dist/index.min.js)
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#### `dequal/lite`
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> **Size (gzip):** 304 bytes<br>
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> **Availability:** [CommonJS](https://unpkg.com/dequal/lite/index.js), [ES Module](https://unpkg.com/dequal/lite/index.mjs)
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| | IE9+ | Number | String | Date | RegExp | Object | Array | Class | Set | Map | ArrayBuffer | [TypedArray](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray#TypedArray_objects) | [DataView](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView) |
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|-|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|
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| `dequal` | :x: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: |
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| `dequal/lite` | :+1: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :x: | :x: | :x: | :x: | :x: |
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> <sup>**Note:** Table scrolls horizontally!</sup>
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## Usage
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```js
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import { dequal } from 'dequal';
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dequal(1, 1); //=> true
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dequal({}, {}); //=> true
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dequal('foo', 'foo'); //=> true
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dequal([1, 2, 3], [1, 2, 3]); //=> true
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dequal(dequal, dequal); //=> true
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dequal(/foo/, /foo/); //=> true
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dequal(null, null); //=> true
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dequal(NaN, NaN); //=> true
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dequal([], []); //=> true
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dequal(
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[{ a:1 }, [{ b:{ c:[1] } }]],
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[{ a:1 }, [{ b:{ c:[1] } }]]
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); //=> true
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dequal(1, '1'); //=> false
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dequal(null, undefined); //=> false
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dequal({ a:1, b:[2,3] }, { a:1, b:[2,5] }); //=> false
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dequal(/foo/i, /bar/g); //=> false
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```
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## API
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### dequal(foo, bar)
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Returns: `Boolean`
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Both `foo` and `bar` can be of any type.<br>
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A `Boolean` is returned indicating if the two were deeply equal.
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## Benchmarks
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> Running Node v10.13.0
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The benchmarks can be found in the [`/bench`](/bench) directory. They are separated into two categories:
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* `basic` – compares an object comprised of `String`, `Number`, `Date`, `Array`, and `Object` values.
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* `complex` – like `basic`, but adds `RegExp`, `Map`, `Set`, and `Uint8Array` values.
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> **Note:** Only candidates that pass validation step(s) are listed. <br>For example, `fast-deep-equal/es6` handles `Set` and `Map` values, but uses _referential equality_ while those listed use _value equality_.
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```
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Load times:
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assert 0.109ms
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util 0.006ms
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fast-deep-equal 0.479ms
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lodash/isequal 22.826ms
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nano-equal 0.417ms
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dequal 0.396ms
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dequal/lite 0.264ms
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Benchmark :: basic
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assert.deepStrictEqual x 325,262 ops/sec ±0.57% (94 runs sampled)
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util.isDeepStrictEqual x 318,812 ops/sec ±0.87% (94 runs sampled)
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fast-deep-equal x 1,332,393 ops/sec ±0.36% (93 runs sampled)
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lodash.isEqual x 269,129 ops/sec ±0.59% (95 runs sampled)
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nano-equal x 1,122,053 ops/sec ±0.36% (96 runs sampled)
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dequal/lite x 1,700,972 ops/sec ±0.31% (94 runs sampled)
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dequal x 1,698,972 ops/sec ±0.63% (97 runs sampled)
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Benchmark :: complex
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assert.deepStrictEqual x 124,518 ops/sec ±0.64% (96 runs sampled)
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util.isDeepStrictEqual x 125,113 ops/sec ±0.24% (96 runs sampled)
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lodash.isEqual x 58,677 ops/sec ±0.49% (96 runs sampled)
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dequal x 345,386 ops/sec ±0.27% (96 runs sampled)
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```
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## License
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MIT © [Luke Edwards](https://lukeed.com)
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