Benchmark: mergeWith lodash vs immutable

HTML Preparation code:

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<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js" integrity="sha512-WFN04846sdKMIP5LKNphMaWzU7YpMyCU245etK3g/2ARYbPK9Ub18eG+ljU96qKRCWh+quCY7yefSmlkQw1ANQ==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>

Tests:

lodash
var a = { a: 'oh', b: 'my', d: [1] }; var b = { c: 'goddess', d: [2] }; var c = _.mergeWith({}, a, b, (x, y) => { if (_.isArray(a)) return a.concat(b) });
immutable
var a = { a: 'oh', b: 'my', d: [1], e: [3] }; var b = { c: 'goddess', d: [2], f: [4] }; var c = Immutable.mergeWith((x, y) => { if(Array.isArray(x)) { return x.concat(y) } return y }, a, b);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash
immutable

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 JSON data and explain what's being tested.

**Benchmark Overview**

The benchmark compares the performance of two JavaScript libraries: Lodash (`_`) and Immutable.js, in merging two objects with an custom merge strategy. The benchmark is designed to test how these libraries handle different types of arrays during the merge process.

**Options Compared**

The benchmark compares the following options:

1. **Lodash's `mergeWith` function**: This function takes three arguments: the object to be merged into, the object to be merged from, and a custom merge strategy.
2. **Immutable.js's `mergeWith` method**: This method also takes two objects to be merged and a custom merge strategy.

**Pros and Cons**

Here are some pros and cons of each approach:

1. **Lodash's `mergeWith` function**:
	* Pros: Lodash is a widely-used library with a large community, its API is easy to use, and it provides a lot of utility functions.
	* Cons: When using custom merge strategies, Lodash can be slower than Immutable.js due to the need for additional processing.
2. **Immutable.js's `mergeWith` method**:
	* Pros: Immutable.js is designed specifically for functional programming, which makes its merge strategy more efficient and predictable.
	* Cons: Immutable.js requires importing an external library (in this case, Lodash), which can add overhead.

**Library and Purpose**

In the provided benchmark, both libraries are used to implement a custom merge strategy. The merge strategy is defined as `(x, y) => { if (_.isArray(a)) return a.concat(b) }` for Lodash and `(x, y) => { if(Array.isArray(x)) { return x.concat(y) } return y }` for Immutable.js.

Both strategies aim to concatenate arrays when merging objects with array properties. However, the implementation differs between libraries.

**Special JS Feature or Syntax**

There are no special JavaScript features or syntax used in this benchmark.

**Other Alternatives**

If you're looking for alternative libraries or approaches, consider:

1. **Lo-Dash**: Another popular utility library that provides a similar `mergeWith` function.
2. **Ramda**: A functional programming library that offers a `mergeWith` function and other useful utilities.
3. **ES6 Spread Operator**: JavaScript's built-in `...` operator can be used to merge objects, but it only works for simple cases and doesn't support custom merge strategies.

In conclusion, the benchmark compares Lodash and Immutable.js's performance when using custom merge strategies to merge objects with array properties. While both libraries have their pros and cons, Immutable.js might offer better performance due to its functional programming design.

Related benchmarks:

mergeWith lodash vs immutable (version: 0)

Comparing performance of: lodash vs immutable

Created: 3 years ago by: Guest

Jump to the latest result

lodash

immutable

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):