Benchmark: iterator speed - MeasureThat.net

Script Preparation code:


var arr = ['', '', ''];

Tests:

for of
for(const a of arr){ console.log(a); }
for
for(var a = 0; a < arr.length; a++){ console.log(a); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for of
for

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.

I'll explain the JavaScript microbenchmark on MeasureThat.net.

**Benchmark Definition**

The benchmark definition is represented by the JSON object provided at the beginning. In this case, it's a simple "iterator speed" benchmark. This means that the benchmark is designed to measure how fast different approaches of iterating over an array can execute.

**Options Compared**

There are two options being compared in this benchmark:

1. **For-of loop**: The first option uses the `for...of` loop syntax, which was introduced in ECMAScript 2015 (ES6). This loop allows you to iterate directly over arrays without having to specify the index or a mapping function.
2. **Traditional for loop**: The second option uses the traditional `for` loop syntax, which is commonly used in JavaScript programming.

**Pros and Cons**

Here are some pros and cons of each approach:

**For-of Loop:**

Pros:

* More concise and readable code
* Less error-prone, as you don't have to worry about index arithmetic
* Can be more efficient, as the V8 engine (used by Chrome) can optimize it better

Cons:

* Not supported in older browsers that don't implement ES6
* May not work correctly in some situations where the iterator is used incorrectly

**Traditional for Loop:**

Pros:

* Widely supported across all modern browsers and JavaScript engines
* Can be more flexible, as you have full control over the iteration process

Cons:

* More verbose and error-prone code
* Requires manual index arithmetic or using `Array.prototype.indexOf()`

**Other Considerations**

The choice between `for-of` and traditional for loops depends on your specific use case, target audience, and performance requirements. If you're targeting modern browsers that support ES6, the `for-of` loop is likely a better choice due to its conciseness and readability.

However, if you need to ensure compatibility with older browsers or require more control over the iteration process, the traditional for loop might be a better fit.

**Library Usage**

There are no libraries used in this benchmark. The script preparation code defines an array `arr` and assigns it to the `const` variable `a`. The HTML preparation code is empty.

**Special JS Features or Syntax**

The benchmark uses two special JavaScript features:

* **For-of loop**: Introduced in ECMAScript 2015 (ES6), this loop allows you to iterate directly over arrays without having to specify the index or a mapping function.
* **Const**: Used to declare variables that cannot be reassigned. In this case, `const arr` ensures that the array is not modified within the loop.

These features are widely supported in modern JavaScript engines and browsers.

**Alternatives**

If you're interested in exploring other alternatives for measuring iteration speed or benchmarking JavaScript performance, here are a few options:

* **Benchmark.js**: A popular benchmarking library for JavaScript that provides more advanced features and configurations.
* **jsperf**: A web-based benchmarking platform that allows you to create and compare benchmarks across multiple browsers and platforms.
* **BenchPress.js**: Another benchmarking library for JavaScript that provides more advanced features and configurations, including support for benchmarking various types of iterations.

Related benchmarks:

iterator speed (version: 0)

Comparing performance of: for of vs for

Created: 3 years ago by: Guest

Jump to the latest result

for of

for

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):