Benchmark: Array.from vs Spread, properly prepared

Script Preparation code:

var fooSet = new Set();
for(var i=0;i<100;i++) {
  fooSet.add(i);
}

Tests:

Array.from
var other = Array.from(fooSet);
Spread
var other = [...fooSet];

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 provided benchmark and explain what's being tested.

**Benchmark Definition**

The test is focused on comparing two approaches to create an array from a Set object:

1. `Array.from(fooSet)`
2. `var other = [...fooSet];` (using the spread operator)

Both approaches aim to convert a Set object, `fooSet`, into an array. However, they differ in their implementation details.

**Options Compared**

The two options being compared are:

1. **`Array.from(fooSet)`**: This method is a built-in JavaScript method that converts an iterable (such as a Set) into an array.
2. **`var other = [...fooSet];`** (using the spread operator): This approach uses the spread operator to create a new array from the elements of `fooSet`.

**Pros and Cons**

1. **`Array.from(fooSet)`**:
	* Pros: Convenient, built-in method, efficient.
	* Cons: May have performance overhead due to the creation of an intermediate array (although this is usually negligible).
2. **`var other = [...fooSet];`** (using the spread operator):
	* Pros: Concise and expressive syntax, may be faster than `Array.from()` since it avoids creating an intermediate array.
	* Cons: Not as explicit or readable as `Array.from()`, may require additional browser support.

**Library/Features Used**

None of the benchmark cases explicitly use a library. However, some browsers (like Safari) might have optimized implementations for certain built-in methods like `Array.from()`.

**Special JS Features/Syntax**

The benchmark uses the spread operator (`...`) which is a relatively modern feature introduced in ECMAScript 2018 (ES2018). This syntax was added to support creating new arrays from iterable sources. The use of this syntax might make the code less compatible with older browsers or environments.

**Other Considerations**

When choosing between these two approaches, consider the following:

* Readability and maintainability: `Array.from()` is often more explicit and readable than using the spread operator.
* Performance: For large datasets, `Array.from()` might have a performance advantage due to its optimized implementation. However, for small datasets or performance-critical code, the spread operator's concise syntax might be preferred.

**Alternatives**

If you need alternative approaches to create an array from a Set object, consider:

1. **`Set.prototype.values()`**: This method returns an iterator that yields each element of the set, which can then be converted to an array using `Array.from()`.
2. **Manual iteration and concatenation**: You could manually iterate over the elements of the set and concatenate them into an array using string interpolation or other methods.

Keep in mind that these alternatives might have different performance characteristics or trade-offs compared to the original options being benchmarked.

Related benchmarks:

Array.from vs Spread, properly prepared (version: 0)

Comparing performance of: Array.from vs Spread

Created: 3 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):