Benchmark: lodash.merge vs deepmerge

HTML Preparation code:

<script src="https://raw.githubusercontent.com/lodash/lodash/4.17.15-npm/lodash.js"></script>
<script src="https://unpkg.com/deepmerge/dist/umd.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:

Lodash.merge
_.merge(obj1, obj2)
deepmerge
deepmerge(obj1, obj2)

Historical Performance Data aggregated from 56 community runs

Desktop Results:

Chrome 56 runs

Lodash.merge

79K/s

deepmerge

57K/s

Fastest: Lodash.merge (1.4x faster)

View exact numbers

✓ Lodash.merge: 79,299 ops/sec
• deepmerge: 57,334 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash.merge
deepmerge

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser/OS: Chrome 135 on Linux

View result in a separate tab

Lodash.merge

57K/s

deepmerge

46K/s

View exact numbers

Test name	Executions per second
✓ Lodash.merge	57,350 Ops/sec
deepmerge	45,749 Ops/sec

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

LLMs can make mistakes. Check important info.

It seems like you're trying to prepare some test data for benchmarking. I'll help you parse and format the data.

Here's the parsed data:

**Objects**

1. `obj1`:
```json
{
    "id": "5005",
    "type": "Sugar"
},
{
    "id": "5007",
    "type": "Powdered Sugar"
},
{
    "id": "5006",
    "type": "Chocolate with Sprinkles"
},
{
    "id": "5003",
    "type": "Chocolate"
},
{
    "id": "5004",
    "type": "Overwritten"
}
```

2. `obj2`:
```json
{
    "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" }
    ]
}
```

3. `obj3`:
```json
{
    "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" }
    ]
}
```

**Individual Test Cases**

1. `Lodash.merge(obj1, obj2)`
2. `deepmerge(obj1, obj2)`

**Latest Benchmark Result**

1. Lodash.merge
	* Raw UA String: `Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36`
	* Browser: Chrome 129
	* Device Platform: Desktop
	* Operating System: Mac OS X 10.15.7
	* Executions Per Second: 96050.7734375
	* Test Name: Lodash.merge
2. deepmerge
	* Raw UA String: `Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36`
	* Browser: Chrome 129
	* Device Platform: Desktop
	* Operating System: Mac OS X 10.15.7
	* Executions Per Second: 60366.91015625
	* Test Name: deepmerge

lodash.merge vs deepmerge (version: 0)

Comparing performance of: `Lodash.merge vs deepmerge`

Created: 5 years ago by: Guest

Go to the latest result

Lodash.merge

deepmerge

Historical Performance Data aggregated from 56 community runs

Desktop Results:

Chrome 56 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

lodash.merge vs deepmerge (version: 0)

Comparing performance of: Lodash.merge vs deepmerge

Created: 5 years ago by: Guest

Go to the latest result

Lodash.merge

deepmerge

Historical Performance Data aggregated from 56 community runs

Desktop Results:

Chrome 56 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Related benchmarks

Comparing performance of: `Lodash.merge vs deepmerge`