Benchmark: Florian Antoine - MeasureThat.net

Script Preparation code:

   var arr = [];
    for (var i = 0; i < 1000; i++) {
      arr[i] = i;
    }

Tests:

foeach
arr.forEach(function (item){ })
for
for (var i = 0, len = arr.length; i < len; i++) { }
map
arr.map(item => {})
for of
for (elem of arr) { }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
foeach
for
map
for of

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.212 Safari/537.36 Edg/90.0.818.66

Browser/OS: Chrome 90 on Windows

View result in a separate tab

Test name	Executions per second
foeach	2477451.0 Ops/sec
for	1978529.6 Ops/sec
map	452758.2 Ops/sec
for of	5148.6 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**Benchmark Definition JSON**

The provided JSON defines a benchmarking framework for JavaScript microbenchmarks. The main structure consists of:

1. **Name**: The name of the benchmark creator (Florian Antoine).
2. **Description**: An empty description field, suggesting that no additional information about the benchmark is provided.
3. **Script Preparation Code**: A snippet of code that sets up an array `arr` with 1000 elements, each initialized to its index value.

The **Html Preparation Code** is empty, indicating that no HTML preparation is needed for this benchmark.

**Individual Test Cases**

Four test cases are defined, each with a unique "Benchmark Definition" string:

1. `arr.forEach(function (item){\r\n\r\n})`: This uses the traditional `forEach` method to iterate over the array.
2. `for (var i = 0, len = arr.length; i < len; i++) {\r\n\r\n}`: This is a traditional for loop that iterates over the array using its length as the condition.
3. `arr.map(item => {})`: This uses the `map` method to create a new array with transformed values (in this case, an empty value).
4. `for (elem of arr) {\r\n\r\n}`: This is a more modern syntax for iteration using the "of" operator.

**Library and Features**

The benchmarks appear to be testing different iteration methods in JavaScript arrays:

* `forEach`: A traditional method for iterating over arrays.
* Traditional `for` loop: Iterates over the array using its length as the condition.
* `map`: A method that creates a new array with transformed values (in this case, an empty value).
* "Of" operator (`for...of`): A more modern syntax for iteration.

The benchmarks do not appear to use any external libraries. However, they do demonstrate different iteration methods in JavaScript, which can have varying performance implications depending on the specific use case and environment.

**Pros and Cons of Different Approaches**

Here's a brief overview of the pros and cons of each approach:

1. **Traditional `forEach`**: Pros: Simple to implement, easy to read. Cons: Can be slower than other methods due to its nature (iterating over the array).
2. Traditional `for` loop: Pros: Fast and efficient for large arrays. Cons: Can be verbose and harder to read.
3. `map`: Pros: Creates a new array with transformed values, can be faster in some cases. Cons: May incur additional memory overhead.
4. "Of" operator (`for...of`): Pros: Modern syntax, easy to read, can be faster than traditional for loops. Cons: May not be supported in older browsers.

**Other Alternatives**

Additional iteration methods not tested here include:

* `reduce`: A method that reduces an array to a single value.
* `every`, `some`, and `filter` methods: These are more functional programming-oriented methods that can also be used for iteration.

Please note that the performance implications of each approach can vary depending on the specific use case, environment, and hardware. The provided benchmarking framework provides a useful starting point for comparing different iteration methods in JavaScript.

Related benchmarks:

Florian Antoine (version: 0)

Comparing performance of: foeach vs for vs map vs for of

Created: 3 years ago by: Guest

Jump to the latest result

foeach

for

map

for of

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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