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

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:

function isObject(x) { return Object.prototype.toString.call(x) === '[object Object]';}

function deepMergeRightOnPlace(target, source) {
  for (const key in source) {
    if (source.hasOwnProperty(key)) {
      const sourceVal = source[key];
      const targetVal = target[key];

      if (
        isObject(sourceVal) && isObject(targetVal)
      ) {
        // Рекурсивное объединение вложенных объектов
        deepMergeRightOnPlace(targetVal, sourceVal);
      } else {
        // Перезапись значения
        target[key] = sourceVal;
      }
    }
  }

  return target;
}

function deepMergeRightOnPlace2(ref, source) {
  const keys = Object.keys(source);
  for (let i = 0; i < keys.length; i += 1) {
    const key = keys[i];

    if (source.hasOwnProperty(key)) {
      const sourceVal = source[key];
      const targetVal = ref[key];

      if (isObject(sourceVal) && isObject(targetVal)) {
        deepMergeRightOnPlace(targetVal, sourceVal);
      } else {
        ref[key] = sourceVal;
      }
    }
  }
};

var obj1 = {
		"a": "0001",
		"b": "donut",
		"c": "Cake",
		"d": 0.55,
		"e":
			{
				"ea":
					[
						{ "id": "1001", "type": "Regular" },
						{ "id": "1002", "type": "Chocolate" },
						{ "id": "1003", "type": "Blueberry" },
						{ "id": "1004", "type": "Devil's Food" }
					]
			},
		"f":
			[
				{ "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" }
			]
	};

var obj2 = 
	{
		"a": "0003",
		"b": "Overwritten",
		"c": "Old Fashioned",
		"d": 0.55,
		"e":
			{
				"ea":
					[
						{ "id": "1001", "type": "Overwritten" },
						{ "id": "1002", "type": "Chocolate" }
					]
			},
		"f":
			[
				{ "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)
deepmergeRightOnPlace
deepMergeRightOnPlace(obj1, obj2)
deepMergeRightOnPlace2
deepMergeRightOnPlace2(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
deepmergeRightOnPlace
deepMergeRightOnPlace2

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 9 months ago)

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:144.0) Gecko/20100101 Firefox/144.0

Browser/OS: Firefox 144 on Linux

View result in a separate tab

deepmergeRightOnPlace

3.0M/s

deepMergeRightOnPlace2

2.3M/s

Ramda.mergeDeepRight

2.0M/s

Lodash.merge

1.2M/s

es-toolkit merge

263K/s

deepmerge

89K/s

View exact numbers

Test name	Executions per second
✓ deepmergeRightOnPlace	3,048,754 Ops/sec
deepMergeRightOnPlace2	2,282,687 Ops/sec
Ramda.mergeDeepRight	1,955,728 Ops/sec
Lodash.merge	1,200,758 Ops/sec
es-toolkit merge	263,401 Ops/sec
deepmerge	88,633 Ops/sec

Deep merge lodash vs ramda vs deepmerge vs es-toolkit vs deepMergeRightOnPlace (version: 1)

Comparing performance of: `Ramda.mergeDeepRight vs Lodash.merge vs deepmerge vs es-toolkit merge vs deepmergeRightOnPlace vs deepMergeRightOnPlace2`

Created: 9 months ago by: Guest

Go to the latest result

Ramda.mergeDeepRight

Lodash.merge

deepmerge

es-toolkit merge

deepmergeRightOnPlace

deepMergeRightOnPlace2

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Deep merge lodash vs ramda vs deepmerge vs es-toolkit vs deepMergeRightOnPlace (version: 1)

Comparing performance of: Ramda.mergeDeepRight vs Lodash.merge vs deepmerge vs es-toolkit merge vs deepmergeRightOnPlace vs deepMergeRightOnPlace2

Created: 9 months ago by: Guest

Go to the latest result

Ramda.mergeDeepRight

Lodash.merge

deepmerge

es-toolkit merge

deepmergeRightOnPlace

deepMergeRightOnPlace2

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `Ramda.mergeDeepRight vs Lodash.merge vs deepmerge vs es-toolkit merge vs deepmergeRightOnPlace vs deepMergeRightOnPlace2`