Benchmark: lodash merge vs object.assign vs spread vs manual forEach

HTML Preparation code:

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

Tests:

lodash merge
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var c = _.merge(a, b);
object.assign
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var c = Object.assign(a, b);
spread
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var c = { ...a, ...b };
Manual forEach
var a = [ { a: 'oh', b: 'my' }, { c: 'goddess' } ]; var c = {}; _.forEach(a, (val, key) => { c[key] = val; });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash merge
object.assign
spread
Manual forEach

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down the benchmark and its components.

**Benchmark Definition**

The website uses a JSON object to define the benchmark, which includes:

1. **Name**: A unique name for the benchmark.
2. **Description**: An optional description of the benchmark (empty in this case).
3. **Script Preparation Code**: Optional code that is executed before running the benchmark (none in this case).
4. **Html Preparation Code**: Optional HTML code that is used to include a JavaScript library (Lodash in this case).

**Individual Test Cases**

The benchmark consists of four test cases, each with its own definition:

1. **_lodash merge**:
	* Uses Lodash's `merge` function to combine two objects.
	* Input: `{ a: 'oh', b: 'my' }` and `{ c: 'goddess' }`
2. **object.assign**:
	* Uses the built-in `Object.assign()` method to merge two objects.
	* Input: `{ a: 'oh', b: 'my' }` and `{ c: 'goddess' }`
3. **spread**:
	* Uses the spread operator (`{ ...a, ...b }`) to combine two objects.
	* Input: `{ a: 'oh', b: 'my' }` and `{ c: 'goddess' }`
4. **Manual forEach**:
	* Uses a manual loop with `forEach()` to iterate over an array of objects and merge them into another object.
	* Input: `[ { a: 'oh', b: 'my' }, { c: 'goddess' } ]` and `{}`

**Options Compared**

The benchmark compares the performance of four different approaches:

1. **Lodash `merge`**: Uses Lodash's `merge` function to combine objects.
2. **Built-in `Object.assign()`**: Uses the built-in `Object.assign()` method to merge objects.
3. **Spread Operator**: Uses the spread operator (`{ ...a, ...b }`) to combine objects.
4. **Manual Loop with `forEach()`**: Uses a manual loop with `forEach()` to iterate over an array of objects and merge them into another object.

**Pros and Cons**

Here's a brief summary of each approach:

1. **Lodash `merge`**:
	* Pros: Efficient, concise, and easy to read.
	* Cons: Requires Lodash library, which may not be included in all environments.
2. **Built-in `Object.assign()`**:
	* Pros: Fast, efficient, and widely supported.
	* Cons: May have limitations on object types (e.g., not supporting functions).
3. **Spread Operator**:
	* Pros: Modern, concise, and easy to read.
	* Cons: May not work with all objects or in older browsers.
4. **Manual Loop with `forEach()`**:
	* Pros: Flexible, efficient for array-based merging.
	* Cons: Can be slower than other approaches due to loop overhead.

**Library and Syntax Considerations**

1. Lodash's `merge` function is a popular utility that combines two objects efficiently.
2. The spread operator (`{ ...a, ...b }`) is a modern syntax introduced in ECMAScript 2018, which allows for concise object merging.

**Alternatives**

Other alternatives for object merging include:

* Using the `Array.prototype.reduce()` method to combine arrays or objects.
* Using a library like Immutable.js or Ramda for functional programming approaches.
* Implementing custom merge functions based on specific requirements.

Related benchmarks:

lodash merge vs object.assign vs spread vs manual forEach (version: 0)

Comparing performance of: lodash merge vs object.assign vs spread vs Manual forEach

Created: 5 years ago by: Guest

Jump to the latest result

lodash merge

object.assign

spread

Manual forEach

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):