Benchmark: my Array loop vs foreach vs map

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(1); })
for
for (var i = 0, len = arr.length; i < len; i++) { someFn(1); }
map
arr.map(item => someFn(1))

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.

**Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks, comparing the performance of different approaches for various tasks.

**Benchmark Definition JSON**

The provided benchmark definition JSON contains three test cases:

* "my Array loop vs foreach vs map" - This is the overall benchmark name.
* "arr.forEach(function (item){\r\n  someFn(1);\r\n})", "for (var i = 0, len = arr.length; i < len; i++) {\r\n  someFn(1);\r\n}", and "arr.map(item => someFn(1))" - These are the individual test cases.

**Tested Approaches**

The benchmark compares three approaches for iterating over an array:

* **Array Loop**: A traditional `for` loop that accesses each element individually.
* **forEach**: The `forEach` method, which calls a callback function for each element in the array.
* **map**: The `map` method, which returns a new array with the results of applying a given function to each element.

**Pros and Cons**

* **Array Loop**:
	+ Pros: Control over iteration order, can be used for complex logic.
	+ Cons: More verbose, may lead to performance issues if not optimized.
* **forEach**:
	+ Pros: Concise syntax, easy to read, and maintain.
	+ Cons: May lead to performance issues if the callback function is computationally expensive.
* **map**:
	+ Pros: Returns a new array with the results, can simplify logic.
	+ Cons: May lead to unnecessary object creation, potentially affecting performance.

**Library Usage**

None of the provided test cases use any external libraries. However, it's worth noting that `someFn` is a function defined within the script preparation code, which could be considered part of the benchmark itself.

**Special JS Features/Syntax**

There are no special JavaScript features or syntax used in these test cases. The focus is on comparing three common approaches for iterating over an array.

**Other Alternatives**

For similar benchmarks, you might want to explore other approaches, such as:

* Using a library like `lodash` for functional programming.
* Comparing the performance of different data structures, such as arrays vs. linked lists.
* Investigating parallel processing or concurrent execution methods.
* Using a benchmarking framework like Benchmark.js.

Keep in mind that the choice of alternative depends on your specific use case and goals.

Related benchmarks:

my Array loop vs foreach vs map (version: 0)

Comparing performance of: foreach vs for vs map

Created: 4 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):