Benchmark: Object iteration (forEach, for of)

Script Preparation code:

var object = {};
  
for (let i = 0; i < 1000; i += 1) {
  object['something' + i] = 'value';
}

Tests:

forEach
Object.entries(object).forEach(([key, value]) => { console.log(key, value); });
for of
for (const [key, value] of Object.entries(object)) { console.log(key, value); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
forEach
for of

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 Overview**

The provided JSON represents a JavaScript benchmarking test case for measuring the performance of two different ways to iterate over an object: using the `forEach` method and the `for...of` loop with `Object.entries`. The benchmark is designed to be run on various browsers, devices, and platforms.

**Tested Options**

The benchmark compares the following options:

1. **forEach**: Iterates over the object using the `forEach` method.
2. **For-of**: Iterates over the object using a traditional `for...of` loop with `Object.entries`.

**Pros and Cons of Each Approach**

* **ForEach**:
	+ Pros: Simple to implement, widely supported by modern browsers.
	+ Cons: May have performance overhead due to function call and closure creation.
* **For-of**:
	+ Pros: Can be faster than `forEach` due to reduced function call overhead, more efficient memory usage.
	+ Cons: Requires knowledge of the `for...of` loop syntax and may not be as widely supported by older browsers.

**Library Usage**

The benchmark uses the `Object.entries()` method, which is a part of the ECMAScript 2015 (ES6) standard. This library provides a convenient way to iterate over objects and their key-value pairs. The `for...of` loop also relies on this library.

**Special JS Features or Syntax**

* **Arrow functions**: Used in both benchmark definitions (`forEach` and `for-of`).
* **Template literals**: Used in the string interpolation of the benchmark script preparation code (`"var object = {};\r\n  \r\nfor (let i = 0; i < 1000; i += 1) {\r\n  object['something' + i] = 'value';\r\n}"`).

**Other Alternatives**

If you want to write a similar benchmark, you can use other methods to iterate over an object, such as:

* Using `for...in` and accessing the property names directly.
* Using a traditional `for` loop with indexing (e.g., `var i = 0; while (i < 1000) { ... }`).
* Using a library like Lodash's `forEach` or `each` methods.

Keep in mind that each approach has its pros and cons, and the choice of method depends on your specific use case and performance requirements.

Related benchmarks:

Object iteration (forEach, for of) (version: 0)

Comparing performance of: forEach vs for of

Created: 3 years ago by: Guest

Jump to the latest result

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):