Benchmark: lodash.assign vs spread operator vs Object.assign

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/lodash@3.10.0/index.min.js"></script>

Script Preparation code:

var a = {foo: "foo"};
var b = {bar: "bar"};

Tests:

lodash.assign
var c = _.assign({}, a, b);
spread operator
var c = {...a, ...b};

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash.assign
spread operator

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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I'll break down the benchmark and explain what's being tested, compared options, pros and cons, library usage, special features or syntax, and alternatives.

**Benchmark Overview**

The benchmark compares the performance of three approaches to merge two objects: `lodash.assign`, the spread operator (`...`), and `Object.assign`. The test case uses a JavaScript object `{a: 'foo'}` and another object `{b: 'bar'}`, which are combined into a new object using each approach.

**Options Compared**

The benchmark compares:

1. **_lodash.assign**: A popular utility library that provides a function for merging objects.
2. **Spread Operator (`...`)**: A shorthand syntax for creating a new object by spreading the properties of an existing object.
3. **Object.assign()**: A built-in JavaScript method for merging two or more objects.

**Pros and Cons**

1. **_lodash.assign_**
	* Pros:
		+ Robust error handling and support for multiple sources.
		+ Returns a new object, preserving the original objects.
	* Cons:
		+ Requires an additional library download (lodash).
		+ May have performance overhead due to its utility nature.
2. **Spread Operator (`...`)**
	* Pros:
		+ Simple and concise syntax.
		+ Fast and lightweight.
		+ Supports multiple sources.
	* Cons:
		+ Only works with objects that support the spread operator (ES6+).
		+ May not be as robust as `_lodash.assign_`.
3. **Object.assign()**
	* Pros:
		+ Built-in, so no additional library is required.
		+ Fast and lightweight.
	* Cons:
		+ Does not preserve the original objects' properties (by reference).
		+ Only supports two sources.

**Library Usage**

`lodash.assign()` uses the `lodash` utility library. Lodash is a popular JavaScript library that provides a collection of functions for common tasks, including object manipulation. The use of lodash can add to the overall size of the bundle and may introduce additional dependencies.

**Special Features or Syntax**

None mentioned in this benchmark.

**Alternatives**

Other alternatives to merge objects include:

1. **Object.create()**: A built-in method that creates a new object based on an existing object.
2. **Array.prototype.reduce()**: Can be used to merge objects by reducing the array of key-value pairs into a single object.
3. **JSON.parse(JSON.stringify(obj))**: Can be used to clone and merge objects, but this approach can lead to performance issues for large objects.

These alternatives may have different trade-offs in terms of readability, maintainability, and performance compared to the options tested in this benchmark.

Related benchmarks:

lodash.assign vs spread operator vs Object.assign (version: 0)

Comparing performance of: lodash.assign vs spread operator

Created: 6 years ago by: Guest

Jump to the latest result

lodash.assign

spread operator

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):