Benchmark: Hello_12312313aa

Script Preparation code:

var data = new Map(Object.entries(Array.from(Array(100000).keys()).reduce((k,v)=>{ if (k !== undefined && typeof v !== undefined) { k[v] = v; return k } },{})))

Tests:

Object.fromEntries
Object.fromEntries(data);
Reduce (reuse object)
Object.entries(data).reduce((acc, [k, v]) => { acc[k] = v.toString(); return acc; }, {});
Reduce (creating temporary objects)
Object.entries(data).reduce((acc, [k, v]) => ({ ...acc, [k]: v.toString() }), {});

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.fromEntries
Reduce (reuse object)
Reduce (creating temporary objects)

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of MeasureThat.net and explore what's being tested in this benchmark.

**Benchmark Overview**

The benchmark is designed to compare three approaches for creating objects from arrays using JavaScript:

1. `Object.fromEntries()`
2. Using `reduce()` with an accumulator object
3. Using `reduce()` while creating temporary objects

These approaches aim to create a map-like object from an array of key-value pairs.

**Library: None**

There is no external library used in this benchmark, so we can focus solely on JavaScript features and syntax.

**Options Compared**

The three options being compared are:

1. **`Object.fromEntries()`**: A built-in method introduced in ECMAScript 2015 (ES6) that creates an object from a map-like iterable.
2. **Reduce with reuse object**: This approach uses `reduce()` to create an accumulator object, which is then updated with new key-value pairs.
3. **Reduce with temporary objects**: In this variant, the `reduce()` method is used to create temporary objects for each iteration.

**Pros and Cons**

1. **`Object.fromEntries()`**:
	* Pros: Simple, efficient, and concise.
	* Cons: Not supported in older browsers or environments that don't have ES6 support.
2. **Reduce with reuse object**:
	* Pros: More memory-efficient than creating temporary objects.
	* Cons: May lead to slower performance due to repeated updates to the accumulator object.
3. **Reduce with temporary objects**:
	* Pros: Creates a new object for each iteration, which might be more efficient in some cases.
	* Cons: Temporarily allocates memory for the created objects, potentially leading to higher overhead.

**Special JS Feature/Syntax**

None are mentioned explicitly, but `Object.fromEntries()` is a modern feature that relies on ES6 syntax. The use of `reduce()` with an accumulator object and temporary objects requires understanding JavaScript's iteration mechanisms and array methods.

**Other Alternatives**

If you need to create objects from arrays in other ways, consider the following approaches:

* Using `forEach()` and updating an existing object: `data.forEach(([k, v]) => { ... });`
* Using a library like Lodash (`_.mapObject()`, `_.reduce()` with an initial value)
* Creating an object using a loop or a custom iterator

Keep in mind that these alternatives may have different trade-offs in terms of performance and memory usage.

For the MeasureThat.net benchmark, the results show that:

* **Reduce with reuse object** is the fastest approach, followed closely by **Object.fromEntries()**, which outperforms **Reduce with temporary objects**.

Related benchmarks:

Hello_12312313aa (version: 0)

123123

Comparing performance of: Object.fromEntries vs Reduce (reuse object) vs Reduce (creating temporary objects)

Created: 3 years ago by: Guest

Jump to the latest result

Object.fromEntries

Reduce (reuse object)

Reduce (creating temporary objects)

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):