Benchmark: Lodash vs json-stable-stringify (Stringify) "a" === "b"

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>

Script Preparation code:

var json = typeof JSON !== 'undefined' ? JSON : console.error("JSON SUPPORT REQUIRED");

var isArray = Array.isArray || function (x) {
	return {}.toString.call(x) === '[object Array]';
};

var objectKeys = Object.keys || function (obj) {
	var has = Object.prototype.hasOwnProperty || function () { return true; };
	var keys = [];
	for (var key in obj) {
		if (has.call(obj, key)) { keys.push(key); }
	}
	return keys;
};

function jsonStableStringify(obj, opts) {
	if (!opts) { opts = {}; }
	if (typeof opts === 'function') { opts = { cmp: opts }; }
	var space = opts.space || '';
	if (typeof space === 'number') { space = Array(space + 1).join(' '); }
	var cycles = typeof opts.cycles === 'boolean' ? opts.cycles : false;
	var replacer = opts.replacer || function (key, value) { return value; };

	var cmp = opts.cmp && (function (f) {
		return function (node) {
			return function (a, b) {
				var aobj = { key: a, value: node[a] };
				var bobj = { key: b, value: node[b] };
				return f(aobj, bobj);
			};
		};
	}(opts.cmp));

	var seen = [];
	return (function stringify(parent, key, node, level) {
		var indent = space ? '\n' + new Array(level + 1).join(space) : '';
		var colonSeparator = space ? ': ' : ':';

		if (node && node.toJSON && typeof node.toJSON === 'function') {
			node = node.toJSON();
		}

		node = replacer.call(parent, key, node);

		if (node === undefined) {
			return;
		}
		if (typeof node !== 'object' || node === null) {
			return json.stringify(node);
		}
		if (isArray(node)) {
			var out = [];
			for (var i = 0; i < node.length; i++) {
				var item = stringify(node, i, node[i], level + 1) || json.stringify(null);
				out.push(indent + space + item);
			}
			return '[' + out.join(',') + indent + ']';
		}

		if (seen.indexOf(node) !== -1) {
			if (cycles) { return json.stringify('__cycle__'); }
			throw new TypeError('Converting circular structure to JSON');
		} else { seen.push(node); }

		var keys = objectKeys(node).sort(cmp && cmp(node));
		var out = [];
		for (var i = 0; i < keys.length; i++) {
			var key = keys[i];
			var value = stringify(node, key, node[key], level + 1);

			if (!value) { continue; }

			var keyValue = json.stringify(key)
					+ colonSeparator
					+ value;

			out.push(indent + space + keyValue);
		}
		seen.splice(seen.indexOf(node), 1);
		return '{' + out.join(',') + indent + '}';

	}({ '': obj }, '', obj, 0));
};

Tests:

_.isEqual
_.isEqual("a", "b");
json-stable-stringify
jsonStableStringify("a") === jsonStableStringify("b")

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.isEqual
json-stable-stringify

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:135.0) Gecko/20100101 Firefox/135.0

Browser/OS: Firefox 135 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
_.isEqual	205258816.0 Ops/sec
json-stable-stringify	7737154.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark definition and explain what's being tested, compared, and its pros and cons.

**Benchmark Definition**

The benchmark measures two functions: Lodash's `isEqual` function and json-stable-stringify (JSST) version 1.0.2's stringification functionality.

**Lodash's `isEqual` Function**

Lodash's `isEqual` function is a utility function that checks if two values are equal, considering primitive types and nested objects.

Pros:

* Efficiently handles complex object comparisons.
* Can handle different data types, such as numbers, strings, booleans, and arrays.

Cons:

* May be slower for very large objects due to its recursive nature.
* Requires the Lodash library, which may add overhead.

**json-stable-stringify (JSST) Stringification Functionality**

The JSST stringification function is designed to produce a stable string representation of JavaScript objects, including cyclic references. It's optimized for performance and handles various edge cases.

Pros:

* Produces a stable and consistent string representation.
* Handles cyclic references efficiently.
* Can be more efficient than other stringification methods for large objects.

Cons:

* May produce larger strings compared to other stringification methods.
* Requires careful optimization to handle certain edge cases, such as nested arrays or objects with complex properties.

**Comparison**

The benchmark compares the performance of Lodash's `isEqual` function and JSST's stringification functionality on two specific inputs: `"a" === "b"` (which should always be false) and an empty object.

**Other Considerations**

* The benchmark uses a virtual user agent (UA) to simulate real-world usage patterns. This helps to provide more realistic results.
* The executions per second metric gives an idea of the performance differences between the two functions.
* The raw UA string, browser, device platform, operating system, and executions per second provide additional context about the test environment.

**Alternatives**

Other alternatives for comparing string equality or object comparisons include:

* `===` operator (native JavaScript)
* `Object.is()` function (native JavaScript)
* Other libraries or frameworks that provide similar functionality to Lodash's `isEqual` or JSST's stringification

Note that these alternatives may have different performance characteristics, pros, and cons compared to the benchmarked functions.

Related benchmarks:

Lodash vs json-stable-stringify (Stringify) "a" === "b" (version: 0)

Used json-stable-stringify (Stringify) version 1.0.2 from https://cdn.jsdelivr.net/npm/json-stable-stringify@1.0.2/index.js

Comparing performance of: _.isEqual vs json-stable-stringify

Created: 2 years ago by: Registered User

Jump to the latest result

_.isEqual

json-stable-stringify

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):