Benchmark: Object.keys() foreach vs for

Script Preparation code:

var test = {
    a: 1,
    b: 2,
    c: 3,
    d: 4,
    e: 5,
    f: 6
};

var testKeys = Object.keys(test);

Tests:

foreach
for (let j = 10000; j > 0; j--) { testKeys.forEach((key) => { console.log(test[key]); }); }
for
for (let j = 10000; j > 0; j--) { for (let i = testKeys.length; i > 0; i--) { console.log(test[testKeys[i]]); } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
foreach
for

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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Let's break down the provided benchmark definition and test cases to understand what is being tested.

**Benchmark Definition**

The benchmark definition is a JSON object that describes two microbenchmarks: `Object.keys() foreach` and `for`. The script preparation code initializes an object `test` with 6 properties, which will be used in the benchmark. The html preparation code is empty, indicating that this is a JavaScript-only benchmark.

**Options being compared**

The two options being compared are:

1. **foreach**: This option uses the `forEach` method provided by the `Object.keys()` function to iterate over the object's properties.
2. **for**: This option uses a traditional `for` loop to iterate over an array of indices, using the length of the `testKeys` array as the upper bound.

**Pros and Cons**

* **foreach**:
	+ Pros: More concise and expressive, easier to read and maintain.
	+ Cons: May be slower due to the overhead of the `forEach` method.
* **for**:
	+ Pros: Generally faster, more control over the iteration process.
	+ Cons: More verbose and less readable.

In general, both options have their trade-offs. The `foreach` approach is often preferred for its concise and expressive nature, but may incur a performance penalty due to the overhead of the method call. The `for` approach provides more control and flexibility, but requires more code and effort to maintain.

**Library usage**

There is no explicit library usage in this benchmark definition. However, it's worth noting that `Object.keys()` is a built-in JavaScript function that returns an array of strings representing the property names of an object.

**Special JS feature or syntax**

This benchmark does not use any special JavaScript features or syntax beyond what is built into the language.

**Alternative approaches**

Some alternative approaches to this benchmark could include:

* Using other iteration methods, such as `for...in` or `Array.prototype.forEach.call()`.
* Using a custom implementation of the iteration logic, such as a recursive function or a utility library.
* Measuring the performance impact of using `Object.keys()` versus an array-based approach (e.g., iterating over indices directly).
* Adding additional variables or conditions to the benchmark to test the performance of different scenarios.

Overall, this benchmark provides a simple and straightforward way to compare the performance of two common iteration approaches in JavaScript.

Related benchmarks:

Object.keys() foreach vs for (version: 0)

Comparing performance of: foreach vs for

Created: 2 years ago by: Registered User

Jump to the latest result

foreach

for

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):