Benchmark: Deep merge lodash vs ramda vs deepmerge vs es-toolkit

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/es-toolkit/dist/browser.global.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/lodash.merge/index.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/ramda/dist/ramda.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/deepmerge/dist/umd.min.js"></script>

Script Preparation code:

var obj1 = [
	{
		"id": "0001",
		"type": "donut",
		"name": "Cake",
		"ppu": 0.55,
		"batters":
			{
				"batter":
					[
						{ "id": "1001", "type": "Regular" },
						{ "id": "1002", "type": "Chocolate" },
						{ "id": "1003", "type": "Blueberry" },
						{ "id": "1004", "type": "Devil's Food" }
					]
			},
		"topping":
			[
				{ "id": "5001", "type": "None" },
				{ "id": "5002", "type": "Glazed" },
				{ "id": "5005", "type": "Sugar" },
				{ "id": "5007", "type": "Powdered Sugar" },
				{ "id": "5006", "type": "Chocolate with Sprinkles" },
				{ "id": "5003", "type": "Chocolate" },
				{ "id": "5004", "type": "Maple" }
			]
	},
	{
		"id": "0002",
		"type": "donut",
		"name": "Raised",
		"ppu": 0.55,
		"batters":
			{
				"batter":
					[
						{ "id": "1001", "type": "Regular" }
					]
			},
		"topping":
			[
				{ "id": "5001", "type": "None" },
				{ "id": "5002", "type": "Glazed" },
				{ "id": "5005", "type": "Sugar" },
				{ "id": "5003", "type": "Chocolate" },
				{ "id": "5004", "type": "Maple" }
			]
	},
	{
		"id": "0003",
		"type": "donut",
		"name": "Old Fashioned",
		"ppu": 0.55,
		"batters":
			{
				"batter":
					[
						{ "id": "1001", "type": "Regular" },
						{ "id": "1002", "type": "Chocolate" }
					]
			},
		"topping":
			[
				{ "id": "5001", "type": "None" },
				{ "id": "5002", "type": "Glazed" },
				{ "id": "5003", "type": "Chocolate" },
				{ "id": "5004", "type": "Maple" }
			]
	}
]

var obj2 = [
	{
		"id": "0001",
		"type": "donut",
		"name": "Cake",
		"ppu": 0.55,
		"batters":
			{
				"batter":
					[
						{ "id": "1001", "type": "Overwritten" },
						{ "id": "1002", "type": "Chocolate" },
						{ "id": "1003", "type": "Overwritten" },
						{ "id": "1004", "type": "Devil's Food" }
					]
			},
		"topping":
			[
				{ "id": "5001", "type": "Overwritten" },
				{ "id": "5002", "type": "Overwritten" },
				{ "id": "5005", "type": "Sugar" },
				{ "id": "5007", "type": "Powdered Sugar" },
				{ "id": "5006", "type": "Chocolate with Sprinkles" },
				{ "id": "5003", "type": "Chocolate" },
				{ "id": "5004", "type": "Overwritten" }
			]
	},
	{
		"id": "0002",
		"type": "Overwritten",
		"name": "Raised",
		"ppu": 0.55,
		"batters":
			{
				"batter":
					[
						{ "id": "1001", "type": "Overwritten" }
					]
			},
		"topping":
			[
				{ "id": "5001", "type": "None" },
				{ "id": "5002", "type": "Overwritten" },
				{ "id": "5005", "type": "Sugar" },
				{ "id": "5003", "type": "Chocolate" },
				{ "id": "5004", "type": "Maple" }
			]
	},
	{
		"id": "0003",
		"type": "Overwritten",
		"name": "Old Fashioned",
		"ppu": 0.55,
		"batters":
			{
				"batter":
					[
						{ "id": "1001", "type": "Overwritten" },
						{ "id": "1002", "type": "Chocolate" }
					]
			},
		"topping":
			[
				{ "id": "5001", "type": "None" },
				{ "id": "5002", "type": "Glazed" },
				{ "id": "5003", "type": "Chocolate" },
				{ "id": "5004", "type": "Maple" }
			]
	}
]

Tests:

Ramda.mergeDeepRight
R.mergeDeepRight(obj1, obj2)
Lodash.merge
merge(obj1, obj2)
deepmerge
deepmerge(obj1, obj2)
es-toolkit merge
_.merge(obj1, obj2)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Ramda.mergeDeepRight
Lodash.merge
deepmerge
es-toolkit merge

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

It looks like we have a JSON object and some benchmark results to work with.

The JSON object appears to be a JavaScript function call, specifically `R.mergeDeepRight(obj1, obj2)`, where `obj1` and `obj2` are objects being merged. The JSON object is:
```json
{
  "id": "5002",
  "type": "Overwritten"
},
{
  "id": "5005",
  "type": "Sugar"
},
{
  "id": "5003",
  "type": "Chocolate"
},
{
  "id": "5004",
  "type": "Maple"
}
]
```
And the benchmark results are:
```json
[
  {
    "RawUAString": "...",
    "Browser": "Chrome 127",
    "DevicePlatform": "Desktop",
    "OperatingSystem": "Windows",
    "ExecutionsPerSecond": 281012.25,
    "TestName": "Ramda.mergeDeepRight"
  },
  {
    "RawUAString": "...",
    "Browser": "Chrome 127",
    "DevicePlatform": "Desktop",
    "OperatingSystem": "Windows",
    "ExecutionsPerSecond": 145272.125,
    "TestName": "es-toolkit merge"
  },
  {
    "RawUAString": "...",
    "Browser": "Chrome 127",
    "DevicePlatform": "Desktop",
    "OperatingSystem": "Windows",
    "ExecutionsPerSecond": 45478.65625,
    "TestName": "Lodash.merge"
  },
  {
    "RawUAString": "...",
    "Browser": "Chrome 127",
    "DevicePlatform": "Desktop",
    "OperatingSystem": "Windows",
    "ExecutionsPerSecond": 29445.7265625,
    "TestName": "deepmerge"
  }
]
```
My analysis:

* The JSON object appears to be an empty list of objects, with each object having a unique `id` and a `type`.
* The benchmark results show the performance of different libraries (Ramda, Lodash, es-toolkit, and deepmerge) on a Chrome browser running on Windows.
* Ramda's `R.mergeDeepRight(obj1, obj2)` is the fastest, followed by es-toolkit's `_.merge()`, then Lodash's `L.merge()`.

Based on this analysis, I'll provide an answer that:

1. Verifies the JSON object and benchmark results are valid.
2. Provides a comparison of the performance of different libraries based on the benchmark results.

Here is my final answer:

**Verification**: The JSON object is a valid JavaScript expression representing two objects being merged. The benchmark results are also valid, showing the performance of each library on a Chrome browser running on Windows.

**Comparison**:

| Library | Executions/Sec |
| --- | --- |
| Ramda | 281012.25 |
| es-toolkit | 145272.125 |
| Lodash | 45478.65625 |
| deepmerge | 29445.7265625 |

Based on these results, Ramda's `R.mergeDeepRight(obj1, obj2)` is the fastest library, followed by es-toolkit's `_.merge()`, then Lodash's `L.merge()`.

Please let me know if this answer meets your requirements!

Latest run results:

Run details: (Test run date: 2 days ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.5 Safari/605.1.15

Browser/OS: Safari 17 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Ramda.mergeDeepRight	389447.2 Ops/sec
Lodash.merge	72644.9 Ops/sec
deepmerge	50113.4 Ops/sec
es-toolkit merge	90852.9 Ops/sec

Related benchmarks:

Deep merge lodash vs ramda vs deepmerge vs es-toolkit (version: 0)

Comparing performance of: Ramda.mergeDeepRight vs Lodash.merge vs deepmerge vs es-toolkit merge

Created: 3 months ago by: Guest

Jump to the latest result

Ramda.mergeDeepRight

Lodash.merge

deepmerge

es-toolkit merge

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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