Benchmark: for vs for..of String 10000

Script Preparation code:

var str = 'a'.repeat(10000)

Tests:

for
for (var i = 0; i < str.length; i++) { str[i] }
for..of
for (var i of str) { i; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for
for..of

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down the benchmark and explain what's being tested.

**Benchmark Definition**

The benchmark is designed to compare the performance of two different loop constructs: `for` and `for...of`. The script preparation code creates a string variable `str` containing 10,000 characters repeated using the `'a'.repeat(10000)` method.

**Options Compared**

Two options are being compared:

1. **Classic `for` loop**: The first test case uses a traditional `for` loop with an index variable `i`. This is a common way to iterate over arrays or strings in JavaScript.
2. **`for...of` loop**: The second test case uses the `for...of` loop, which is a more modern and concise way to iterate over arrays or iterables.

**Pros and Cons**

* **Classic `for` loop**:
	+ Pros: Widely supported across different browsers and environments.
	+ Cons: Can be verbose and less readable for complex iterations.
* **`for...of` loop**:
	+ Pros: More concise and readable, especially for simple iterations.
	+ Cons: May not be as widely supported in older browsers or environments.

**Other Considerations**

The benchmark also includes the browser, device platform, operating system, and executions per second. This provides a more comprehensive view of the performance differences between the two loop constructs.

**Library Usage**

Neither of the test cases uses any external libraries. The script preparation code is self-contained, and the loops are executed directly in the browser's context.

**Special JavaScript Features**

The `for...of` loop utilizes a special JavaScript feature called "iterators" or "iteration protocols". This allows the loop to work with arrays, strings, and other iterables without needing an explicit index variable. The classic `for` loop does not use this feature.

In summary, this benchmark is designed to compare the performance of two common loop constructs in JavaScript: traditional `for` loops and more modern `for...of` loops. By using a simple iteration task and measuring executions per second, we can get an idea of which approach is faster and more efficient.

Related benchmarks:

for vs for..of String 10000 (version: 0)

Compare loop performance

Comparing performance of: for vs for..of

Created: 5 years ago by: Guest

Jump to the latest result

for

for..of

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):