Benchmark: lodash merge vs object.assign vs spread - fixed

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 };

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash merge
object.assign
spread

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 provided benchmark definition and its test cases to understand what is being tested.

**Benchmark Definition**

The benchmark measures the performance of three different methods for merging objects in JavaScript:

1. `lodash.merge`
2. `object.assign`
3. Spread syntax (`{ ...a, ...b }`)

All tests create two objects, `a` and `b`, with some common properties. The test then merges these objects using each of the three methods and measures the execution time.

**Options Compared**

The options being compared are:

* `lodash.merge`: A utility function from the Lodash library that recursively merges two objects.
* `object.assign`: A built-in JavaScript method that merges one or more source objects into a target object.
* Spread syntax (`{ ...a, ...b }`): A new way of merging objects using the spread operator.

**Pros and Cons**

Here's a brief overview of the pros and cons of each approach:

1. `lodash.merge`:
	* Pros: Provides a concise and readable way to merge objects, supports recursion, and has a large community backing.
	* Cons: Requires including an additional library (Lodash), which may not be desirable for every project.
2. `object.assign`:
	* Pros: Built-in method, no dependencies required, easy to use.
	* Cons: Only merges shallowly, doesn't support recursion or more complex data structures.
3. Spread syntax (`{ ...a, ...b }`):
	* Pros: Modern and concise way to merge objects, supports nested objects and arrays.
	* Cons: May not be as readable for complex cases, can lead to unexpected behavior if not used carefully.

**Library Used**

The `lodash.merge` function is a utility from the Lodash library, which provides a wide range of functional programming helpers. The library is included in the benchmark's preparation code via a script tag.

**Special JS Feature or Syntax**

None mentioned in this specific benchmark. However, it's worth noting that the spread syntax was introduced in ECMAScript 2018 (ES2018) and allows for more concise object merging. It has become increasingly popular in modern JavaScript development.

**Other Alternatives**

For those who might be interested in exploring other alternatives:

* `Object.assign()` with `.concat()` or `.slice()` to merge arrays
* Using a library like `merge-deep` for deeper object merging
* Implementing custom merging logic using recursive functions

Keep in mind that each of these approaches has its own trade-offs and considerations, depending on the specific use case and requirements.

Related benchmarks:

lodash merge vs object.assign vs spread - fixed (version: 0)

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

Created: 5 years ago by: Guest

Jump to the latest result

lodash merge

object.assign

spread

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):