Benchmark: map vs fromentries 2

Tests:

map
const x = {...(new Map([[1,'a'],[2,'b'],[3,'c']]))}
fromentries
const x = Object.fromEntries([[1,'a'],[2,'b'],[3,'c']])

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
map
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 benchmark and its components.

**Benchmark Definition**

The provided JSON represents a JavaScript microbenchmark that tests two approaches for iterating over an object:

1. `map()`
2. `Object.fromEntries()` (also known as "from entries" or "object from entries")

**Options Compared**

These two options are being compared to determine which one is faster in terms of executions per second.

**Pros and Cons**

* **`map()`**:
	+ Pros: More commonly used, easier to understand for developers familiar with array methods.
	+ Cons: Can be slower due to the need to create a new array, especially for large inputs.
* `Object.fromEntries()`: 
  + Pros: Generally faster than `map()` since it avoids creating an intermediate array and directly returns an object. It's also more concise and expressive.
  + Cons: Less well-known among developers, so might require additional explanation or context.

**Library/Functionality Used**

In this benchmark, the following library/functionality is used:

* `Object.fromEntries()`: This is a built-in JavaScript function introduced in ECMAScript 2017 (ES7). It's used to create an object from key-value pairs provided as an array of [key, value] pairs.

**Special JS Feature/Syntax**

This benchmark uses the `...(new Map())` syntax to create a map (an object that stores key-value pairs) and then creates an object from entries using `Object.fromEntries()`. This is a new syntax introduced in ECMAScript 2015 (ES6), specifically as part of the `Map.prototype.entries()` method, which allows iterating over the key-value pairs of a Map.

**Other Alternatives**

If you were to write this benchmark without using `Object.fromEntries()`, you could use other approaches to iterate over the object, such as:

* Using `forEach()` or `for...in` loops
* Converting the map to an array and then iterating over it with an index loop

Keep in mind that these alternatives would likely have different performance characteristics compared to using `Object.fromEntries()`.

In summary, this benchmark is testing two approaches for iterating over an object: `map()` and `Object.fromEntries()`. The pros of `fromEntries()` include its speed and conciseness, but the cons are that it's less well-known among developers.

Related benchmarks:

map vs fromentries 2 (version: 0)

Comparing performance of: map vs fromentries

Created: 5 years ago by: Guest

Jump to the latest result

map

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):