Benchmark: Array.from vs Spread vs Manual

Tests:

Array.from
const fooSet = new Set(); for(let i=0;i<500;i++) { fooSet.add(i); } for (const [i, v] of Array.from(fooSet).entries()) {}
Spread
const fooSet = new Set(); for(let i=0;i<500;i++) { fooSet.add(i); } for (const [i, v] of [...fooSet].entries()) {}
Iterator
const fooSet = new Set(); for(let i=0;i<500;i++) { fooSet.add(i); } let i = -1 for (const v of fooSet) { i += 1 }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.from
Spread
Iterator

Fastest: N/A

Slowest: N/A

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

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**Benchmark Overview**

The benchmark measures the performance difference between three ways to iterate over a set data structure in JavaScript: `Array.from`, spread syntax (`...`), and manual iteration using an iterator. The test creates a set with 500 elements, adds them to the set, and then iterates over the set using each of the three methods.

**Options Compared**

The benchmark compares the following options:

1. **Manual Iteration**: Using a traditional `for` loop to iterate over the set.
2. **Spread Syntax (`...`)**: Using the spread syntax to convert the set to an array and then iterating over it.
3. **`Array.from()`**: Using the `Array.from()` method to create a new array from the set and then iterating over it.

**Pros and Cons**

Here are some pros and cons of each approach:

1. **Manual Iteration**
	* Pros: Simple, easy to understand, and performant for small datasets.
	* Cons: Can be error-prone, especially when working with large datasets.
2. **Spread Syntax (`...`)**
	* Pros: Concise, readable, and efficient for converting sets to arrays.
	* Cons: Creates a new array, which can lead to memory issues for very large datasets.
3. **`Array.from()`**
	* Pros: Efficient, performant, and easy to use for iterating over sets.
	* Cons: Can be slower than manual iteration for small datasets, and may not be suitable for very large datasets.

**Library Used**

In this benchmark, the `Set` object is used as a data structure. The `Set` object is a built-in JavaScript data structure that stores unique values in an unordered collection. Its primary purpose is to provide fast membership testing (i.e., checking whether an element exists in the set).

**Special JS Features or Syntax**

There are no special JavaScript features or syntax mentioned in this benchmark.

**Alternative Approaches**

Other alternatives for iterating over sets include:

1. **Using a `forEach()` loop**: Similar to manual iteration, but using the `forEach()` method instead.
2. **Using `for...of` loops**: This is similar to spread syntax and `Array.from()`, but without creating an intermediate array.
3. **Using `iterator()` methods**: Such as `next()` or `done`, which can be used to manually iterate over a set.

Keep in mind that these alternatives may have different performance characteristics depending on the specific use case and dataset size.

Related benchmarks:

Array.from vs Spread vs Manual (version: 0)

Comparing performance of: Array.from vs Spread vs Iterator

Created: 3 years ago by: Guest

Jump to the latest result

Array.from

Spread

Iterator

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):