Benchmark: lodash merge vs lodash assign vs object.assign vs spread - Single Level

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js'></script>

Tests:

lodash merge
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var c = _.merge(a, b);
lodash assign
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var c = _.assign(a, b);
spread
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var c = { ...a, ...b };
assign
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var c = Object.assign({}, a, b);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash merge
lodash assign
spread
assign

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 dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Overview**

The provided benchmark compares four approaches for merging or assigning values to an object:

1. Lodash `merge` function
2. Lodash `assign` function
3. Using the spread operator (`...`)
4. Using `Object.assign` method

Each test case creates two objects, `a` and `b`, with some properties in common. The benchmark then attempts to merge or assign these objects together, measuring the execution time for each approach.

**Lodash Merge Function**

The Lodash `merge` function is a utility function that merges two or more objects into one, preserving their structure. It's designed to handle nested objects and arrays.

Pros:

* Handles nested objects and arrays
* Preserves structure of original objects

Cons:

* Can be slower than other approaches for simple objects with few properties
* Requires Lodash library

**Lodash Assign Function**

The Lodash `assign` function is another utility function that merges two or more objects into one, but unlike `merge`, it only assigns new properties to the destination object, without modifying the source objects.

Pros:

* Faster than `merge` for simple objects with few properties
* Only requires Lodash library

Cons:

* Does not preserve structure of original objects (only assigns new properties)
* Can be slower for complex objects with nested structures

**Spread Operator (`...`)**

The spread operator is a shorthand way to create a new object by spreading the properties of an existing object.

Pros:

* Fast and concise
* Only requires native JavaScript features

Cons:

* Limited support for nested objects and arrays
* Can be slower than `assign` for large objects with many properties

**Object.assign Method**

The `Object.assign` method is a built-in function that merges two or more objects into one, overwriting any existing properties.

Pros:

* Fast and concise
* Only requires native JavaScript features

Cons:

* Overwrites existing properties in destination object
* Can be slower than `assign` for large objects with many properties

**Other Considerations**

When using these approaches, it's essential to consider the following factors:

* Performance: Speed is critical when dealing with complex objects and large datasets.
* Code readability: Choose an approach that makes your code easy to understand and maintain.
* Library dependencies: Some approaches, like Lodash `merge` and `assign`, require additional libraries.

**Alternatives**

If you're not satisfied with the results or want to explore other options, consider the following alternatives:

1. Immutable.js: A library for working with immutable data structures, which can provide a different approach to merging and assigning objects.
2. TypeScript's Spread Operator: TypeScript's implementation of the spread operator provides additional features, such as type checking and automatic null checks.
3. Vanilla JavaScript libraries like jQuery or Underscore.js: These libraries offer alternative utility functions for working with objects and arrays.

By understanding the strengths and weaknesses of each approach, you can choose the best method for your specific use case and optimize your code for performance, readability, and maintainability.

Related benchmarks:

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

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

Created: 7 years ago by: Guest

Jump to the latest result

lodash merge

lodash assign

spread

assign

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):