Benchmark: Object.fromEntries on array vs reduce on array vs reduce(reuse object) - 100 products

Script Preparation code:

var data = Array.from(Array(100).keys());

Tests:

Reduce(reuse)
data.reduce((acc, value) => { acc[value] = value.toString(); return acc; }, {});
Reduce
data.reduce((acc, value) => ({ ...acc, [value]: value.toString() }), {});
Object.fromEntries
Object.fromEntries(data.map((value) => [value, value.toString()]));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Reduce(reuse)
Reduce
Object.fromEntries

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 benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark compares three approaches to create an object from an array of key-value pairs:

1. Using `Array.prototype.reduce()` with an initial value of an empty object (`{}`) as the accumulator.
2. Using `Array.prototype.reduce()` with a modified accumulation syntax that directly assigns properties to the accumulator object.
3. Using `Object.fromEntries()` to create an object from an array of key-value pairs.

**Options Compared**

The benchmark compares the performance of these three approaches on an array of 100 products ( generated by `Array.from(Array(100).keys())`).

**Pros and Cons of Each Approach**

1. **Reduce(reuse)**:
	* Pros: Simple, straightforward implementation.
	* Cons: Requires careful initialization of the accumulator object to avoid unexpected behavior.
2. **Reduce**:
	* Pros: Similar to Reduce(reuse) but with a more concise syntax.
	* Cons: Still requires attention to accumulator object initialization.
3. **Object.fromEntries()**:
	* Pros: Modern, efficient approach that creates an object from an array of key-value pairs.
	* Cons: May not be supported in older browsers or Node.js versions.

**Library and Purpose**

The `Array.prototype.reduce()` method is a built-in JavaScript method that applies a reduction function to each element of an array, accumulating the results. The library here is JavaScript's standard library itself.

**Special JS Features or Syntax**

None are mentioned in this benchmark.

**Other Considerations**

When choosing between these approaches, consider the following:

* If you need to support older browsers or Node.js versions, `Object.fromEntries()` might not be an option.
* If you're working with large datasets and performance is critical, `Object.fromEntries()` might offer a slight performance advantage due to its optimized implementation.

**Alternatives**

If you prefer not to use `Array.prototype.reduce()` or `Object.fromEntries()`, you could consider using other libraries or polyfills, such as:

* Lodash's `_.reduce()` method
* Underscore.js's `_.reduce()` function
* A custom implementation using a loop and object literal creation

However, these alternatives might introduce additional dependencies or complexity to your codebase.

Related benchmarks:

Object.fromEntries on array vs reduce on array vs reduce(reuse object) - 100 products (version: 0)

Comparing performance of: Reduce(reuse) vs Reduce vs Object.fromEntries

Created: 3 years ago by: Guest

Jump to the latest result

Reduce(reuse)

Reduce

Object.fromEntries

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):