Benchmark: for vs for..of with strings

Script Preparation code:

var array = Array.from({
    length: 100
}, () => String.fromCharCode((Math.random() * 26) + 65 | 0)).join('');

Tests:

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

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 benchmark and explain what's being tested, compared, and their pros and cons.

**What is being tested?**

The benchmark measures the performance difference between two loop types: traditional `for` loops and `for...of` loops with arrays. The test case specifically compares these two approaches when iterating over a large array of random strings.

**Options compared:**

1. **Traditional `for` loops**: This approach uses an explicit counter variable (`i`) to iterate over the array indices.
2. **`for...of` loops**: This approach uses the iterator protocol to iterate over the array elements, without needing an explicit counter variable.

**Pros and Cons of each approach:**

1. **Traditional `for` loops**:
	* Pros:
		+ Faster execution time due to less overhead from iterator protocol.
		+ More control over iteration variables and loop logic.
	* Cons:
		+ Requires manual management of the counter variable (`i`) and array indices.
		+ May lead to more complex code, making it harder to read and maintain.
2. **`for...of` loops**:
	* Pros:
		+ Easier to write and read code, as iteration is handled automatically by the loop.
		+ Less prone to errors related to array indices or counter variables.
	* Cons:
		+ May incur a slight performance penalty due to iterator protocol overhead.
		+ Limited control over iteration variables and loop logic.

**Library usage:**

In this benchmark, the `Array.from` method is used to create a large array of random strings. This library function creates an array from an iterable (in this case, a function that generates random characters) and returns it as an array. The purpose of using `Array.from` is to ensure consistent performance characteristics for both loop types.

**Special JS feature or syntax:**

None mentioned in the provided benchmark code.

**Other considerations:**

* The test uses a Windows desktop platform with Chrome 88 browser, which may affect the results.
* The `ExecutionsPerSecond` metric represents the average number of executions per second, which is an important performance indicator for this benchmark.
* The benchmark likely uses some underlying optimization techniques to minimize overhead and ensure accurate measurements.

**Alternative approaches:**

Other alternatives could include:

1. Using other loop constructs, such as `while` loops or recursive functions.
2. Implementing custom iteration logic using bitwise operations or array methods (e.g., `forEach`, `map`, or `filter`).
3. Comparing performance with different data structures, such as arrays vs. linked lists or objects.

Keep in mind that these alternatives might not be relevant to this specific benchmark, and the comparison between traditional `for` loops and `for...of` loops is likely the primary focus of MeasureThat.net's analysis.

Related benchmarks:

for vs for..of with strings (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):