Benchmark: Array loop vs foreach vs map (whit string manipulation)

Script Preparation code:

   var arr = [];
    for (var i = 0; i < 1000; i++) {
      arr[i] = i;
    }
  
    function someFn(i) {
      let str = ('flying elephants').split(' ')[1]
      return i * 3 + str;
    }

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(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:

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

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**Benchmark Definition JSON**

The provided benchmark definition represents a simple JavaScript code snippet that creates an array, populates it with numbers from 0 to 999, and then applies the `someFn` function to each element. The `someFn` function takes an integer as input, splits the string "flying elephants" into words (excluding the first word), multiplies the input by 3, and returns the result.

The script preparation code is responsible for creating the array and defining the `someFn` function. In this case, the `for` loop creates the array with 1000 elements, while the `forEach`, `map`, and other individual test cases apply the `someFn` function to each element using different approaches.

**Options Compared**

The benchmark compares three options:

1. **foreach**: Uses a traditional `for...of` loop with a callback function inside the `forEach` method.
2. **for**: Uses a traditional `for` loop to iterate over the array elements.
3. **map**: Uses the `Array.prototype.map()` method, which applies a transformation function to each element in the array.

**Pros and Cons**

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

* **foreach**:
	+ Pros: Simple to implement, straightforward syntax.
	+ Cons: May be slower due to callback function overhead.
* **for**:
	+ Pros: Fast, native loop execution.
	+ Cons: More verbose, requires manual array indexing.
* **map**:
	+ Pros: Concise, efficient, and optimized for performance.
	+ Cons: Requires understanding of the `map()` method's behavior.

In general, the `foreach` approach is simpler to understand but may incur additional overhead due to callback functions. The `for` loop provides a low-level, direct access to array elements, while the `map()` method offers a concise and optimized way to perform transformations.

**Library**

None of the individual test cases use any libraries beyond the standard JavaScript library.

**Special JS Features or Syntax**

The benchmark does not explicitly use any special JavaScript features or syntax that would require additional explanation. However, it's worth noting that the `map()` method relies on a functional programming style, which may be unfamiliar to some developers.

**Alternative Approaches**

Other alternatives for this specific use case could include:

* Using `Array.prototype.reduce()` instead of `foreach` or `for`
* Employing a library like Lodash or Ramda for more concise and expressive array operations
* Utilizing Web Workers or parallel processing for concurrent execution

Keep in mind that the benchmark's focus is on comparing the performance of these three specific approaches, so exploring alternative methods might not directly impact the results.

Related benchmarks:

Array loop vs foreach vs map (whit string manipulation) (version: 0)

Comparing performance of: foreach vs for vs map

Created: 3 years ago by: Guest

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):