Benchmark: array iteration SMALL3

Script Preparation code:

var myArraySmall = Array(3);
for (let i=0; i<3; i++) {
	myArraySmall[i] = i; 
}

Tests:

for element of SMALL
for (ele of myArraySmall) { let something = ele; }
for const element of SMALL
for (const ele of myArraySmall) { let something = ele; }
myArr forEach SMALL
myArraySmall.forEach(function(s) { let something = s; });
array index SMALL
for (let i=0; i<3; i++) { let something = myArraySmall[i]; }
map
myArraySmall.map((i) => { let something = i; });
forEach ES6 SMALL
myArraySmall.forEach(s => { let something = s; });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for element of SMALL
for const element of SMALL
myArr forEach SMALL
array index SMALL
map
forEach ES6 SMALL

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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Autogenerated LLM Summary (model llama3.1:latest, generated one year ago):

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Let's break down the benchmark test cases and results.

**Benchmark Description**

The benchmark measures the performance of different ways to iterate over an array in JavaScript. The test case creates an array `myArraySmall` with three elements, each initialized with a value from 0 to 2. Then, six different methods are tested for iterating over this array:

1. Using a `for...of` loop with a constant variable declaration (`let something = ele;`)
2. Using a `for...of` loop with a mutable variable declaration (`let something = ele;`)
3. Using the `forEach()` method with a traditional callback function
4. Using an indexed `for` loop to access elements by their indices (`myArraySmall[i]`)
5. Using the `map()` method to create a new array of transformed values (not executed in this case, but shown for completeness)
6. Using the modern `forEach()` method with an arrow function (introduced in ES6)

**Test Results**

The results show the number of executions per second for each test case on a specific browser and device platform (Firefox 66 on Windows 7 Desktop). The faster method is expected to have a higher execution rate.

Here are the key takeaways from the results:

1. **Using `forEach()` with an arrow function** (`myArr forEach SMALL` and `forEach ES6 SMALL`) is the fastest approach, outperforming other methods by up to 2.9x (for Firefox 66 on Windows 7 Desktop).
2. **Indexed `for` loop** (`array index SMALL`) performs well, but its execution rate is lower than the `forEach()` method.
3. **Using `map()`** (not executed in this case) might be useful for creating new arrays, but it's slower than other methods for simple iteration tasks.

**Options Compared**

The benchmark compares six different ways to iterate over an array:

1. `for...of` loop with a constant variable declaration
2. `for...of` loop with a mutable variable declaration
3. Indexed `for` loop
4. Traditional `forEach()` method
5. Modern `forEach()` method (ES6) with an arrow function
6. `map()` method (not executed in this case)

**Pros and Cons of Different Approaches**

Each approach has its pros and cons:

1. **For...of loop**: Simple to read, but might be slower than other methods.
	* Pros: Easy to write, suitable for small arrays.
	* Cons: Performance might suffer for large arrays.
2. **Indexed `for` loop**: A traditional way to access elements by their indices.
	* Pros: Suitable for indexed operations.
	* Cons: Not as concise as modern iteration methods.
3. **forEach() method** (traditional and ES6): Allows for easy iteration over arrays without manual indexing.
	* Pros: Easy to read, suitable for most use cases.
	* Cons: Might be slower than `for...of` loops or indexed `for` loops.

**Library Usage**

In this benchmark, the only library used is the built-in JavaScript array methods (e.g., `forEach()`, `map()`).

**Special JS Feature or Syntax**

The modern `forEach()` method and arrow functions are special features introduced in ES6. They improve code readability and conciseness.

**Alternatives**

Other alternatives for iterating over arrays include:

1. **Array iterators**: You can use array iterators like `array[Symbol.iterator]()` to iterate over arrays.
2. **Loops with incrementing indices**: While not the most efficient way, using a loop with an incremented index (e.g., `for (let i = 0; i < array.length; i++)`) is still a viable option.

Keep in mind that this benchmark focuses on iterating over small arrays. For larger datasets or specific use cases, other approaches might be more suitable.

Related benchmarks:

array iteration SMALL3 (version: 9)

Comparing performance of: for element of SMALL vs for const element of SMALL vs myArr forEach SMALL vs array index SMALL vs map vs forEach ES6 SMALL

Created: 7 years ago by: Registered User

Jump to the latest result

for element of SMALL

for const element of SMALL

myArr forEach SMALL

array index SMALL

map

forEach ES6 SMALL

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.1:latest, generated one year ago):