Benchmark: lodash.assign - MeasureThat.net

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"};
var __assign = (this && this.__assign) || function () {
    __assign = Object.assign || function(t) {
        for (var s, i = 1, n = arguments.length; i < n; i++) {
            s = arguments[i];
            for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
                t[p] = s[p];
        }
        return t;
    };
    return __assign.apply(this, arguments);
};

Tests:

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

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark definition and test cases to explain what's being tested, compared, and the pros/cons of each approach.

**Benchmark Definition**

The benchmark uses a JSON object that defines two benchmark tests:

1. `lodash.assign`: This is a built-in JavaScript function in Lodash library (a utility library for functional programming). The purpose of this function is to create a new object with all own enumerable properties of the source objects.
2. `spread operator`: This is a new syntax introduced in ECMAScript 2015 (ES6) that allows spreading an array or object into another object.

**Script Preparation Code**

The script preparation code defines two variables: `a` and `b`, which are objects with single properties (`foo` and `bar`, respectively). The code also defines a function `__assign` that is used as the fallback for Lodash's `Object.assign()` method if it's not available. This is a common pattern when using older browsers or environments that don't support modern JavaScript features.

**Html Preparation Code**

The HTML preparation code includes a script tag that loads the Lodash library version 3.10.0 from a CDN. This ensures that the benchmark tests are executed with the correct version of Lodash.

**Individual Test Cases**

There are two test cases:

1. `lodash.assign`: This test case executes the following JavaScript code:
```javascript
var c = _.assign({}, a, b);
```
This creates a new object `c` by merging the properties of `a` and `b`.

2. `spread operator`: This test case executes the following JavaScript code:
```javascript
var c = __assign({}, a, b);
```
This creates a new object `c` using the spread operator syntax.

**Comparison and Pros/Cons**

The benchmark compares the execution performance of both test cases on different platforms (Firefox 67 on Mac OS X 10.14).

Pros and Cons:

* **Lodash's `assign()` method**: This is a reliable and well-tested function that provides a flexible way to merge objects. However, it may incur additional overhead due to its complexity.
* **Spread operator syntax**: This is a modern JavaScript feature that allows for concise object merging. However, older browsers or environments might not support it.

In general:

* Using `assign()` from Lodash can provide better performance and reliability, especially when working with complex objects or edge cases. However, this approach may require additional library dependencies.
* The spread operator syntax is a more modern and concise way to merge objects. However, its support varies across browsers and environments, which might impact compatibility.

**Other Considerations**

* **Library dependencies**: The benchmark uses Lodash as the library for the `assign()` method. This means that users will need to include this library in their project if they want to use this approach.
* **Modern JavaScript features**: The spread operator syntax relies on modern JavaScript features, which might not be supported by older browsers or environments.

**Alternative Approaches**

If you don't want to use Lodash's `assign()` method or the spread operator syntax, you can consider alternative approaches:

* Use `Object.assign()` from the built-in `Object` object.
* Implement your own object merging function using a loop or recursion.
* Use a different library that provides similar functionality.

Keep in mind that each approach has its pros and cons, and the best choice depends on the specific requirements of your project.

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:67.0) Gecko/20100101 Firefox/67.0

Browser/OS: Firefox 67 on Mac OS X 10.14

View result in a separate tab

Test name	Executions per second
lodash.assign	3143421.2 Ops/sec
spread operator	4523820.5 Ops/sec

Related benchmarks:

lodash.assign (version: 0)

Comparing performance of: lodash.assign vs spread operator

Created: 5 years ago by: Guest

Jump to the latest result

lodash.assign

spread operator

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):