Benchmark: lodash merge vs asign

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

let data = {}
for (i = 0; i < 200; i++) {
  const sub = { x: 9, y: 8, z: 7 }
  data[i] = { 
    a: 1, 
    b: 2, 
    c: {
      x: 9, 
      y: 8, 
      z: 7
    }
  }
}
window.data = data

let newData = {}
for (i = 0; i < 100; i++) {
  const sub = { x: 9, y: 8, z: 7 }
  newData[i] = { 
    a: 0, 
    b: 0, 
    c: {
      x: 0, 
      y: 0, 
      z: 0
    }
  }
}
window.newData = newData

Tests:

lodash merge
var c = _.merge(window.data, window.newData);
spread
var c = { ...window.data, ...window.newData };
for in
let clone = Object.assign({}, window.newData) Object.keys(window.data).forEach(key => clone[key] = window.newData[key])

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash merge
spread
for in

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

Let's dive into the explanation of the provided benchmark.

**Benchmark Overview**

The benchmark measures the performance of three different approaches to merge two objects: `lodash.merge`, `spread` (using the spread operator), and `for in`. The test data consists of 200 nested objects, with each object containing three properties: `a`, `b`, and `c`.

**Options Compared**

1. **_lodash.merge**: This function takes two objects as arguments and returns a new object that combines the properties of both objects.
2. **Spread Operator (`...`)**: This operator creates a new object by spreading the properties of an existing object into it.
3. **`for in` loop**: This approach iterates over the properties of one object, setting each property of another object to the corresponding value.

**Pros and Cons**

1. **_lodash.merge_**
	* Pros: Efficiently handles nested objects, provides a clear and concise API.
	* Cons: Requires an external library (Lodash), may have additional overhead due to dependency loading.
2. **Spread Operator (`...`)**
	* Pros: Lightweight, easy to understand, widely supported.
	* Cons: May not handle deeply nested objects efficiently, can lead to unnecessary property creation.
3. **`for in` loop**
	* Pros: No external dependencies required, efficient for shallow objects.
	* Cons: Can be cumbersome for deeply nested objects, error-prone due to missing keys.

**Library Usage**

The benchmark uses the Lodash library (`lodash.js`) for the `_lodash.merge` approach. The spread operator is a native JavaScript feature and does not require an external library.

**Special JS Features/Syntax**

None of the approaches use any special JavaScript features or syntax beyond what's already mentioned (spread operator).

**Other Alternatives**

For merging objects, other alternatives to Lodash include:

* `Object.assign()`
* `Object.create()`
* `Object.merge()` (in some modern browsers and Node.js versions)

Additionally, if you're looking for a more lightweight alternative to the spread operator, you could consider using a library like `lodash.cloneDeep` or implementing your own shallow cloning function.

Keep in mind that this benchmark is focused on the performance of merging objects, not on other aspects of object manipulation.

Related benchmarks:

lodash merge vs asign (version: 1)

Comparing performance of: lodash merge vs spread vs for in

Created: 7 years ago by: Registered User

Jump to the latest result

lodash merge

spread

for in

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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