dequal

A tiny (304B to 489B) utility to check for deep equality

This module supports comparison of all types, including Function, RegExp, Date, null, undefined, and NaN values. Objects and Arrays are traversed recursively.

Please note that key order within Objects does not matter.
However, the value order within Arrays does matter.

This module exposes three module definitions:

• CommonJS: dist/dequal.js
• ESModule: dist/dequal.mjs
• UMD: dist/dequal.min.js

Install

$ npm install --save dequal

Modes

There are two "versions" of dequal available:

dequal

Size (gzip): 489 bytes
Availability: CommonJS, ES Module, UMD

dequal/lite

Size (gzip): 304 bytes
Availability: CommonJS, ES Module

	IE9+	Number	String	Date	RegExp	Object	Array	Class	Set	Map	ArrayBuffer	TypedArray	DataView
dequal	❌	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
dequal/lite	👍	✅	✅	✅	✅	✅	✅	✅	❌	❌	❌	❌	❌

^{Note: Table scrolls horizontally!}

Usage

import dequal from 'dequal';

dequal(1, 1); //=> true
dequal({}, {}); //=> true
dequal('foo', 'foo'); //=> true
dequal([1, 2, 3], [1, 2, 3]); //=> true
dequal(dequal, dequal); //=> true
dequal(/foo/, /foo/); //=> true
dequal(null, null); //=> true
dequal(NaN, NaN); //=> true
dequal([], []); //=> true
dequal(
  [{ a:1 }, [{ b:{ c:[1] } }]],
  [{ a:1 }, [{ b:{ c:[1] } }]]
); //=> true

dequal(1, '1'); //=> false
dequal(null, undefined); //=> false
dequal({ a:1, b:[2,3] }, { a:1, b:[2,5] }); //=> false
dequal(/foo/i, /bar/g); //=> false

API

dequal(foo, bar)

Returns: Boolean

Both foo and bar can be of any type.
A Boolean is returned indicating if the two were deeply equal.

Benchmarks

Running Node v10.13.0

The benchmarks can be found in the /bench directory. They are separated into two categories:

• basic – compares an object comprised of String, Number, Date, Array, and Object values.
• complex – like basic, but adds RegExp, Map, Set, and Uint8Array values.

Note: Only candidates that pass validation step(s) are listed.
For example, fast-deep-equal/es6 handles Set and Map values, but uses referential equality while those listed use value equality.

Load times:
  assert             0.109ms
  util               0.006ms
  fast-deep-equal    0.479ms
  lodash/isequal    22.826ms
  nano-equal         0.417ms
  dequal             0.396ms
  dequal/lite        0.264ms

Benchmark :: basic
  assert.deepStrictEqual  x    325,262 ops/sec ±0.57% (94 runs sampled)
  util.isDeepStrictEqual  x    318,812 ops/sec ±0.87% (94 runs sampled)
  fast-deep-equal         x  1,332,393 ops/sec ±0.36% (93 runs sampled)
  lodash.isEqual          x    269,129 ops/sec ±0.59% (95 runs sampled)
  nano-equal              x  1,122,053 ops/sec ±0.36% (96 runs sampled)
  dequal/lite             x  1,700,972 ops/sec ±0.31% (94 runs sampled)
  dequal                  x  1,698,972 ops/sec ±0.63% (97 runs sampled)

Benchmark :: complex
  assert.deepStrictEqual  x    124,518 ops/sec ±0.64% (96 runs sampled)
  util.isDeepStrictEqual  x    125,113 ops/sec ±0.24% (96 runs sampled)
  lodash.isEqual          x     58,677 ops/sec ±0.49% (96 runs sampled)
  dequal                  x    345,386 ops/sec ±0.27% (96 runs sampled)

License

MIT © Luke Edwards