Benchmark: for of vs for loop v3

Script Preparation code:

var arr = [...Array(1000).keys()]

Tests:

for of
let z = []; for (let num of arr) { if(num % 3 || num % 5) { z.push(num); } }
for loop
let z = []; for (let x = 0; x < arr.length; x++) { if(arr[x] % 3 || arr[x] % 5) { z.push(arr[x]); } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for of
for loop

Fastest: N/A

Slowest: N/A

Latest 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 dive into the world of MeasureThat.net and explore what's being tested in this benchmark.

**Overview**

The benchmark is comparing the performance of two approaches to iterate over an array: the `for...of` loop and the traditional `for` loop. The test case uses JavaScript, which allows for various optimization techniques and features that can impact performance.

**Options Compared**

Two options are being compared:

1. **For...of Loop**: This loop iterates over an array using a special syntax (`let num of arr`). It's designed to work with iterable objects, like arrays, and provides some benefits, such as:
	* Improved readability and conciseness.
	* Automatic binding of the loop variable to the current element.
2. **Traditional For Loop**: This loop uses the traditional syntax (`for (let x = 0; x < arr.length; x++)`) and requires explicit indexing and incrementing.

**Pros and Cons**

### For...of Loop

Pros:

* Improved readability and conciseness, making the code more expressive.
* Automatic binding of the loop variable to the current element.

Cons:

* May incur overhead due to the special syntax and automatic binding.
* Less control over iteration variables and indices.

### Traditional For Loop

Pros:

* Provides explicit control over iteration variables and indices.
* Can be more efficient in some cases, as it avoids the overhead of automatic binding.

Cons:

* More verbose code, which can lead to readability issues if not maintained properly.

**Library Used**

None is explicitly mentioned in this benchmark definition. However, both loops use native JavaScript features without relying on external libraries.

**Special JS Features or Syntax**

Yes, both loops use a special syntax: the `for...of` loop uses the "iteration" keyword (`let num of arr`), while the traditional for loop uses explicit indexing and incrementing (`x < arr.length`). These features are specific to JavaScript and provide unique benefits and trade-offs.

**Other Considerations**

When choosing between these two approaches, consider the following factors:

* Readability and maintainability: If conciseness and readability are more important than performance, use the `for...of` loop.
* Performance-critical code: If low latency is crucial, use the traditional for loop to gain more control over iteration variables and indices.

**Alternative Approaches**

If you need to compare other iterative approaches or features in JavaScript, consider the following alternatives:

1. **Array.prototype.forEach()**: This method provides a similar syntax to `for...of` but with additional benefits like support for callbacks.
2. **For-in Loop**: This loop uses an "in" operator to iterate over array elements and properties.
3. **Map or Set Iteration**: These data structures provide specialized iteration methods that can offer performance advantages in certain scenarios.

Keep in mind that these alternatives may have different trade-offs and benefits, depending on your specific use case and requirements.

Related benchmarks:

for of vs for loop v3 (version: 0)

Comparing performance of: for of vs for loop

Created: 4 years ago by: Guest

Jump to the latest result

for of

for loop

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):