Benchmark: typedarry for vs for..of vs forEach

Script Preparation code:

var array = new Uint32Array(new Array(100).fill(0).map((v, i) => i));
var val;

Tests:

for
var len = array.length; for (var i = 0; i < len; i++) { val = array[i]; }
forEach
array.forEach(function(value) { val = value; });
for..of
for (var value of array) { val = value; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for
forEach
for..of

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.

The provided JSON represents a JavaScript benchmark test case created on MeasureThat.net. The test aims to compare the performance of three different approaches for iterating over an array: the traditional `for` loop, the `forEach` method, and the `for...of` loop.

**Options compared:**

1. Traditional `for` loop: This approach uses a manual index variable (`i`) to iterate over the array.
2. `forEach` method: This approach uses a callback function to process each element in the array.
3. `for...of` loop: This approach uses a simple and concise syntax to iterate over the array, without needing an explicit index variable.

**Pros and cons of each approach:**

1. Traditional `for` loop:
	* Pros: Wide support across browsers, can be optimized for specific use cases (e.g., caching or memoization).
	* Cons: Can be verbose, requires manual index management.
2. `forEach` method:
	* Pros: Concise and readable syntax, automatic handling of array length and indexing.
	* Cons: May incur performance overhead due to the callback function invocation.
3. `for...of` loop:
	* Pros: Concise and expressive syntax, eliminates the need for manual index management.
	* Cons: Limited support across older browsers, may not be as optimized as traditional `for` loops.

**Library usage:**

None of the provided benchmark tests use any external libraries.

**Special JS features or syntax:**

The `for...of` loop uses a new feature introduced in ECMAScript 2015 (ES6), which allows iterating over arrays and other iterable objects without needing an explicit index variable. The `forEach` method also uses this feature, as it is often implemented on top of the `for...of` loop.

**Other alternatives:**

If you need to iterate over an array in a different way, some alternative approaches include:

1. Using `Array.prototype.map()` or `Array.prototype.reduce()` for functional programming-style iteration.
2. Using a `while` loop with manual indexing for more control over the iteration process.
3. Utilizing libraries like Lodash or Ramda for functional programming and array manipulation.

In summary, the provided benchmark test case allows users to compare the performance of three common approaches for iterating over arrays: traditional `for` loops, `forEach` methods, and `for...of` loops.

Related benchmarks:

typedarry for vs for..of vs forEach (version: 0)

Comparing performance of: for vs forEach vs for..of

Created: 3 years ago by: Guest

Jump to the latest result

for

forEach

for..of

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):