Benchmark: Array loop vs foreach vs map ( full closure )

Script Preparation code:

   var arr = [];
    for (var i = 0; i < 1000; i++) {
      arr[i] = i;
    }
  
    function someFn(i) {
      return i * 3 * 8;
    }

Tests:

foreach
arr.forEach(function(item){ someFn(item); })
for
for (var i = 0, len = arr.length; i < len; i++) { someFn(arr[i]); }
map
arr.map(function(item) { someFn(item); })

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
foreach
for
map

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 provided JSON and explain what's being tested.

**Benchmark Definition**

The benchmark is testing three different ways to iterate over an array: `Array.forEach()`, `for` loop, and `Array.map()` with a closure (a function that has access to its own scope).

**Options Compared**

1. **Array.forEach()**: This method iterates over the array using a callback function, which is executed for each element in the array.
2. **For Loop**: A traditional `for` loop uses an index variable to keep track of the current position in the array.
3. **Array.map()` with Closure: This method creates a new array by applying the provided closure (a function) to each element in the original array.

**Pros and Cons**

1. **Array.forEach()**:
	* Pros: Simple, concise, and easy to read.
	* Cons: May not be as efficient as `for` loops or `map()` with closures due to the overhead of function calls.
2. **For Loop**:
	* Pros: Can be more efficient than `forEach()` and `map()`, especially for large arrays, since it avoids function call overhead.
	* Cons: More verbose and harder to read than `forEach()` and `map()`.
3. **Array.map()` with Closure**:
	* Pros: Creates a new array with the transformed values, which can be useful in some cases.
	* Cons: May create unnecessary memory allocation and copying of data.

**Library/Functionality Used**

There is no explicit library or framework mentioned in the benchmark definition or test cases. However, `forEach()` is an Array method implemented by JavaScript itself.

**Special JS Features/Syntax**

None are explicitly mentioned.

**Other Considerations**

The benchmark is likely intended to test the performance of these iteration methods on modern browsers like Firefox 117. The results should give insight into which method is fastest and most efficient for each browser and device platform.

**Alternatives**

If you're looking for alternative benchmarks or tools, here are a few:

1. **Benchmarking libraries**: Tools like Benchmark.js, Micrometer, or Perf provide more advanced benchmarking capabilities than MeasureThat.net.
2. **Benchmarking frameworks**: Frameworks like Jest, Mocha, or Cypress include built-in support for benchmarking and can be used to create custom benchmarks.
3. **Web performance testing tools**: Tools like WebPageTest, GTmetrix, or Pingdom provide more comprehensive web performance testing capabilities than MeasureThat.net.

Keep in mind that the choice of benchmarking tool or library depends on your specific needs and goals.

Related benchmarks:

Array loop vs foreach vs map ( full closure ) (version: 1)

Comparing performance of: foreach vs for vs map

Created: 6 years ago by: Registered User

Jump to the latest result

foreach

for

map

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):