Benchmark: Object.assign vs batch Object.assign v2

HTML Preparation code:

<script>
    var target1 = {}
    var target2 = {}

    const a = {
        foo: 'foo',
        bar: 'bar',
        baz: 'baz',
        qux: 'qux'
    }
    const b = {
        a: 'a',
        b: 'b',
        c: 'c',
        d: 'd',
        e: 'e',
        f: 'f'
    }
    const batch = [a, b, a, b, a, b, a, b, a, b]
</script>

Tests:

Object.assign
Object.assign(target1, a, b) Object.assign(target1, a, b) Object.assign(target1, a, b) Object.assign(target1, a, b) Object.assign(target1, a, b)
Batch Object.assign
Object.assign(target2, ...batch)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.assign
Batch Object.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 break down the benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark compares two approaches to assigning objects to variables in JavaScript: traditional `Object.assign()` and batched `Object.assign(v2)`. The goal is to determine which approach is faster.

**Options Compared**

1. **Traditional `Object.assign()`**: This method takes multiple arguments, including the target object (`target1` or `target2`) and an array of objects to assign (`a`, `b`, etc.). It iterates over each object in the array, merging its properties with the target object.
2. **Batched `Object.assign(v2)`**: This method also takes multiple arguments, but it uses the spread operator (`...batch`) to pass an entire array of objects at once. The batched approach is optimized for performance by reducing the number of iterations.

**Pros and Cons**

1. **Traditional `Object.assign()`**:
	* Pros: Generally easy to read and maintain, as each assignment is explicit.
	* Cons: Can be slower due to the overhead of multiple function calls and array lookups.
2. **Batched `Object.assign(v2)`**:
	* Pros: Optimized for performance, reducing iterations and making it faster.
	* Cons: May have a higher learning curve, as the batched syntax can be unfamiliar to some developers.

**Library/Function Used**

In this benchmark, no external libraries are used. However, `Object.assign(v2)` is not an official ECMAScript standard; it's a polyfill or extension of the original `Object.assign()` method. This allows for improved performance by avoiding the overhead of multiple function calls.

**Special JS Feature/Syntax**

This benchmark uses the spread operator (`...batch`) to pass an array of objects to `Object.assign()`. The spread operator is a relatively modern JavaScript feature introduced in ECMAScript 2015 (ES6).

**Other Alternatives**

For this specific use case, other approaches could include:

1. Using `forEach()` with `Object.prototype.hasOwnProperty.call()` to iterate over the object properties.
2. Employing a custom function that iterates over the object properties and assigns them using `target[property] = source[property];`.

However, these alternatives would likely have different performance characteristics compared to the traditional and batched `Object.assign()` approaches.

**Additional Considerations**

When choosing between traditional and batched `Object.assign()`, consider the following factors:

1. Readability: Traditional `Object.assign()` is often easier to read and understand, as each assignment is explicit.
2. Performance: Batched `Object.assign(v2)` can provide significant performance gains when working with large arrays of objects.
3. Code Maintenance: If you need to modify or extend the behavior of `Object.assign()`, batched syntax might require more effort to adapt.

Ultimately, the choice between traditional and batched `Object.assign()` depends on your specific use case, performance requirements, and coding style preferences.

Related benchmarks:

Object.assign vs batch Object.assign v2 (version: 0)

Comparing performance of: Object.assign vs Batch Object.assign

Created: 5 years ago by: Guest

Jump to the latest result

Object.assign

Batch Object.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):