Benchmark: Array.from vs Spread of Map

Tests:

Array.from
var fooMap = new Map(); for(var i=0;i<1000;i++) { fooMap.set(i, i); } var other = Array.from(fooMap);
Spread
var fooMap = new Map(); for(var i=0;i<1000;i++) { fooMap.set(i, i); } var other = [...fooMap];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.from
Spread

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 test cases.

**Benchmark Overview**

The benchmark compares two approaches to convert a Map object to an array: `Array.from` and the spread operator (`...`).

**Test Cases**

There are only two test cases:

1. **"Array.from"`**: This test case creates a new Map object `fooMap` with 1000 key-value pairs, where each key is a unique number from 0 to 999. Then it uses `Array.from()` to convert the Map object to an array and assigns it to the variable `other`.
2. **"Spread"`**: This test case creates the same Map object `fooMap` as in the previous test case. Instead of using `Array.from()`, it uses the spread operator (`...`) to create a new array by spreading the keys and values of the Map object.

**Options Compared**

The benchmark compares two options:

1. **`Array.from()`**: This method creates a new array from an iterable (in this case, the Map object). It's a concise way to convert an iterable to an array.
2. **Spread Operator (`...`)**: This operator creates a new array by spreading the elements of an iterable (in this case, the Map object).

**Pros and Cons**

Here are some pros and cons of each approach:

* **`Array.from()`**:
	+ Pros:
		- More concise and readable
		- Works with any iterable, not just Maps
	+ Cons:
		- May have performance overhead due to the creation of a new array
* **Spread Operator (`...`)**
	+ Pros:
		- More explicit and controlled (you have direct access to each key-value pair)
		- Can be more performant for very large datasets, as it avoids creating a new array
	+ Cons:
		- Less concise and readable
		- Only works with iterables that support the spread operator (e.g., Maps, arrays)

**Library/Functionality Used**

Neither of these test cases uses any libraries or external functions. They rely solely on built-in JavaScript features.

**Special JS Features/Syntax**

There are no special JavaScript features or syntax used in these test cases. The code is straightforward and easy to understand.

**Other Alternatives**

If you were to compare other approaches, some alternatives could be:

* Using the `Object.values()` method and then concatenating the results into an array
* Using a custom loop to iterate over the Map object's key-value pairs and push them onto an array

However, these alternatives would likely have similar performance characteristics to `Array.from()`, as they all involve creating a new array or iterable. The spread operator (`...`) is generally considered the most efficient way to convert a Map object to an array.

Keep in mind that the benchmark results may vary depending on the specific JavaScript engine, version, and system configuration used.

Related benchmarks:

Array.from vs Spread of Map (version: 0)

Comparing performance of: Array.from vs Spread

Created: 2 years ago by: Guest

Jump to the latest result

Array.from

Spread

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):