Benchmark: Iterate-Set-many

Script Preparation code:

var manyItemSet = new Set(Array.from({ length: 1000 }, (_, i) => i));
var arr = Array.from(manyItemSet);

Tests:

for of: many items
let result = 0; for (const item of manyItemSet) { result += item; }
convert to array: many items
let result = 0; let l = arr.length; for (let i = l; i--;) { result += arr[i]; }
native iterator: many items
let result = 0; let val = null; const iter = manyItemSet.values(); while (!(val = iter.next()).done) { result += val.value; }
native iterator w/ size: many items:
let result = 0; let iter = manyItemSet.values(); for (let i = manyItemSet.size; i--;) { result += iter.next().value; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for of: many items
convert to array: many items
native iterator: many items
native iterator w/ size: many items:

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and its test cases.

**Benchmark Definition**

The benchmark is defined by the following JSON object:
```json
{
  "Name": "Iterate-Set-many",
  "Description": "Iterate over a set.",
  "Script Preparation Code": "var manyItemSet = new Set(Array.from({ length: 1000 }, (_, i) => i));\r\nvar arr = Array.from(manyItemSet);"
}
```
Here, we have a simple benchmark that creates a large set (`manyItemSet`) with 1,000 items and then converts it to an array (`arr`). The script preparation code is executed before the test cases.

**Test Cases**

The benchmark consists of four test cases:
```json
[
  {
    "Benchmark Definition": "let result = 0;\r\nfor (const item of manyItemSet) {\r\n  result += item;\r\n}\r\n",
    "Test Name": "for of: many items"
  },
  {
    "Benchmark Definition": "let result = 0;\r\nlet l = arr.length;\r\nfor (let i = l; i--;) {\r\n  result += arr[i];\r\n}",
    "Test Name": "convert to array: many items"
  },
  {
    "Benchmark Definition": "let result = 0;\r\nlet val = null;\r\nconst iter = manyItemSet.values();\r\nwhile (!(val = iter.next()).done) {\r\n  result += val.value;\r\n}\r\n",
    "Test Name": "native iterator: many items"
  },
  {
    "Benchmark Definition": "let result = 0;\r\nlet iter = manyItemSet.values();\r\nfor (let i = manyItemSet.size; i--;) {\r\n  result += iter.next().value;\r\n}",
    "Test Name": "native iterator w/ size: many items:"
  }
]
```
These test cases compare different approaches to iterate over the set:

1. `for of` loop
2. Manual array indexing (`arr[i]`)
3. Using a native iterator (`manyItemSet.values()` and `iter.next()`)
4. Using a native iterator with the size (`manyItemSet.size`)

**Pros and Cons**

Here's a brief overview of each approach:

1. **For of loop**: Pros: concise, easy to read, and efficient (since it's optimized for iteration). Cons: may have overhead due to type checking and garbage collection.
2. **Manual array indexing**: Pros: simple and straightforward. Cons: prone to errors, slow (especially for large arrays), and not as efficient as `for of` or native iterators.
3. **Native iterator**: Pros: efficient, readable, and allows for better control over iteration. Cons: may require more boilerplate code.
4. **Native iterator with size**: Pros: similar to the native iterator, but with an additional optimization (using the size). Cons: slightly less efficient than using `manyItemSet.size` directly.

**Library**

The benchmark uses the built-in JavaScript `Set` and `Array` objects, as well as the `values()` method of the `Set` interface.

**Special JS feature or syntax**

There are no special features or syntaxes mentioned in this benchmark. All code is standard JavaScript.

**Other alternatives**

If you wanted to use alternative libraries or approaches, here are some options:

* Use a library like Lodash or Ramda for iteration and array manipulation.
* Use a different data structure, such as an array or linked list.
* Implement your own custom iterator or loop.

However, in this specific benchmark, the JavaScript `Set` and `Array` objects provide a good balance of efficiency, readability, and performance.

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36

Browser/OS: Chrome 119 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
for of: many items	741056.8 Ops/sec
convert to array: many items	29801.3 Ops/sec
native iterator: many items	712298.1 Ops/sec
native iterator w/ size: many items:	664617.9 Ops/sec

Related benchmarks:

Iterate-Set-many (version: 0)

Iterate over a set.

Comparing performance of: for of: many items vs convert to array: many items vs native iterator: many items vs native iterator w/ size: many items:

Created: one year ago by: Guest

Jump to the latest result

for of: many items

convert to array: many items

native iterator: many items

native iterator w/ size: many items:

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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