Benchmark: Set Iteration with spread 2

HTML Preparation code:

<script>
window.object = {};
for (var i = 0, length = Math.pow(10, 5); i < length; ++i) object[i] = Math.random();
window.array = Object.getOwnPropertyNames(object).map(function(key) {
  return object[key];
});
try {
  window.set = new Set(array);
} catch(e){
  console.log("Set is not supported");
}
try {
  window.map = new Map(array.map(function(value, i) {
  return [i, value];
}));
} catch(e){
  console.log("Map is not supported");
}

//chrome bug
if (window.set && set.size == 0 || window.map && map.size == 0) array.forEach(function(value, index) {
  if (window.set) set.add(value);
  if (window.map) map.set(index, value);
});
window.method = function(value, index, container) {
  value;
  index;
  container;
}
</script>

Tests:

set foreach
set.forEach(method);
set spread
[...set].forEach(method);
set iterator
var iterator = set.values(); var iteratorResult = iterator.next(); while (!iteratorResult.done) { method() var iteratorResult = iterator.next(); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
set foreach
set spread
set iterator

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what is tested, compared options, pros/cons, and other considerations.

**Benchmark Definition**

The benchmark defines three test cases:

1. `set.forEach(method);` - Iterates over a Set object using the `forEach()` method.
2. `[...set].forEach(method);` - Iterates over a Set object using the spread operator (`...`) to create an array and then iterates over it with `forEach()`.
3. `var iterator = set.values(); var iteratorResult = iterator.next(); while (!iteratorResult.done) { method() var iteratorResult = iterator.next(); }` - Iterates over a Set object using its `values()` method, which returns an iterator.

**Options Compared**

The benchmark compares the performance of three different approaches:

1. **Traditional `forEach()`**: Using the built-in `forEach()` method to iterate over the Set object.
2. **Spread Operator (`...`) + `forEach()```**: Creating an array from the Set object using the spread operator and then iterating over it with `forEach()`.
3. **Iterator-based iteration**: Using the `values()` method to create an iterator and iterating over it manually.

**Pros and Cons**

Here are some pros and cons of each approach:

1. **Traditional `forEach()`**:
	* Pros: Simple, easy to read, and widely supported.
	* Cons: May be slower due to overhead from calling a built-in function.
2. **Spread Operator (`...`) + `forEach()``:
	* Pros: Can be faster than traditional `forEach()` since it avoids the overhead of calling a built-in function.
	* Cons: Creates an unnecessary array, which can lead to memory allocation and deallocation overhead.
3. **Iterator-based iteration**:
	* Pros: Can be faster than traditional `forEach()` or spread operator approach since it avoids creating unnecessary data structures.
	* Cons: Requires more manual management of the iterator, which can be error-prone.

**Library/ Framework**

The benchmark uses a Set object, which is a built-in JavaScript collection type. The Set object provides methods for adding and removing elements, as well as iterating over its contents using `forEach()` or other methods.

**Special JS Feature/Syntax**

The benchmark uses the spread operator (`...`) to create an array from the Set object, which is a feature introduced in ECMAScript 2015 (ES6). This syntax allows for more concise and expressive code, but it may not be supported in older browsers or environments.

**Other Considerations**

* The benchmark does not account for other factors that might affect performance, such as memory allocation, garbage collection, or CPU instructions.
* The test cases are designed to compare the performance of different iteration approaches, but they do not provide any insights into the optimization techniques used by modern JavaScript engines.

**Alternatives**

If you're looking for alternative benchmarks or testing frameworks, consider:

1. **JIM (JavaScript Iteration Microbenchmark)**: A benchmarking framework specifically designed for measuring the performance of JavaScript iteration methods.
2. **ES6 Benchmark**: A benchmarking framework that focuses on testing the performance of ECMAScript 2015 (ES6) features and implementations.
3. **Bench.js**: A lightweight, open-source benchmarking library for Node.js applications.

Keep in mind that these alternatives may not provide exactly the same test cases or comparison scenarios as MeasureThat.net, but they can still help you understand performance characteristics of different JavaScript iteration methods.

Related benchmarks:

Set Iteration with spread 2 (version: 0)

Comparing performance of: set foreach vs set spread vs set iterator

Created: 5 years ago by: Guest

Jump to the latest result

set foreach

set spread

set 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):