Benchmark: for of over a small array v2

Script Preparation code:

function meow() {
  return [1, 2, 42, 52];
  
}

Tests:

native for of
const foo = meow() foo.push(1337); let blah = 0; for (let i of foo) { blah += i; }
babel for of
const foo = meow(); foo.push(1337); let blah = 0; var _iteratorNormalCompletion = true; var _didIteratorError = false; var _iteratorError = undefined; try { for (var _iterator = foo[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) { let i = _step.value; blah += i; } } catch (err) { _didIteratorError = true; _iteratorError = err; } finally { try { if (!_iteratorNormalCompletion && _iterator.return != null) { _iterator.return(); } } finally { if (_didIteratorError) { throw _iteratorError; } } }
babel for of loose
var foo = meow(); foo.push(1337); let blah = 0; for (var _iterator = foo, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator]();;) { var _ref; if (_isArray) { if (_i >= _iterator.length) break; _ref = _iterator[_i++]; } else { _i = _iterator.next(); if (_i.done) break; _ref = _i.value; } var i = _ref; blah += i; }
indexed for loop
const foo = meow() foo.push(1337); let blah = 0; for (let k = 0; k < foo.length; k++) { blah += foo[k]; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
native for of
babel for of
babel for of loose
indexed for loop

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 provided JSON benchmark data.

**Benchmark Definition**

The `Script Preparation Code` defines a small array `[1, 2, 42, 52]`, which is used as input for the benchmarks.

**Options being compared**

There are four options being compared:

1. **Native For Of**: This option uses the native JavaScript `for...of` loop syntax to iterate over the array.
2. **Babel For Of Loose**: This option uses the `babel-for-of-loose` library (more on this later) with a relaxed iteration strategy, which can lead to slower performance but may avoid certain pitfalls.
3. **Babel For Of**: This option uses the full-fledged `babel-for-of` library, which provides more features and control over the iteration process than the loose version.
4. **Indexed For Loop**: This option uses a traditional `for` loop with an indexed variable to iterate over the array.

**Pros and Cons of each approach**

1. **Native For Of**:
	* Pros: Fastest performance, most idiomatic JavaScript syntax.
	* Cons: May be less readable for developers unfamiliar with the syntax.
2. **Babel For Of Loose**:
	* Pros: Can avoid certain pitfalls (e.g., iterator errors) while still providing a fast iteration experience.
	* Cons: Relaxed iteration strategy may lead to slower performance in some cases.
3. **Babel For Of**:
	* Pros: Provides more features and control over the iteration process than `babel-for-of-loose`.
	* Cons: May have a steeper learning curve for developers unfamiliar with the syntax.
4. **Indexed For Loop**:
	* Pros: Most readable and maintainable option, as it avoids the complexities of iterator-based loops.
	* Cons: Slowest performance among the options.

**Libraries and their purpose**

1. **babel-for-of-loose**: This library provides a relaxed iteration strategy that can avoid certain pitfalls in `for...of` loops. It's designed to provide faster performance while still being more forgiving than the full-fledged `babel-for-of` library.
2. **babel-for-of**: This library provides a more comprehensive iteration experience, including features like iterator caching and support for advanced iteration strategies.

**Special JavaScript feature or syntax**

The `for...of` loop syntax is a relatively recent addition to the JavaScript language, introduced in ECMAScript 2015 (ES6). It allows for iterating over arrays and other iterable objects using a more concise and readable syntax than traditional `for` loops.

Overall, the benchmarks provide valuable insights into the performance characteristics of different iteration strategies in JavaScript. By understanding the pros and cons of each approach, developers can make informed decisions about which iteration method to use in their own projects.

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.122 Safari/537.36

Browser/OS: Chrome 80 on Windows

View result in a separate tab

Test name	Executions per second
native for of	3718181.8 Ops/sec
babel for of	794920.3 Ops/sec
babel for of loose	1895848.2 Ops/sec
indexed for loop	3342161.2 Ops/sec

Related benchmarks:

for of over a small array v2 (version: 0)

Comparing performance of: native for of vs babel for of vs babel for of loose vs indexed for loop

Created: 4 years ago by: Guest

Jump to the latest result

native for of

babel for of

babel for of loose

indexed for loop

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):